CN102236769A - Multiplier-divider and method thereof - Google Patents
Multiplier-divider and method thereof Download PDFInfo
- Publication number
- CN102236769A CN102236769A CN2010101567711A CN201010156771A CN102236769A CN 102236769 A CN102236769 A CN 102236769A CN 2010101567711 A CN2010101567711 A CN 2010101567711A CN 201010156771 A CN201010156771 A CN 201010156771A CN 102236769 A CN102236769 A CN 102236769A
- Authority
- CN
- China
- Prior art keywords
- signal
- input voltage
- sawtooth
- voltage
- electric capacity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims abstract description 26
- 238000007600 charging Methods 0.000 claims abstract description 22
- 238000005070 sampling Methods 0.000 claims description 9
- 230000000052 comparative effect Effects 0.000 claims 1
- 230000001737 promoting effect Effects 0.000 abstract 2
- 238000006467 substitution reaction Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000013341 scale-up Methods 0.000 description 1
Images
Landscapes
- Manipulation Of Pulses (AREA)
Abstract
The invention discloses a multiplier-divider and a method thereof, which are used for multiplying input current by first input voltage and then dividing a product by second input voltage to generate output voltage so as to achieve the advantages of no need of a BJT (Bipolar Junction Transistor), high elasticity and simple circuit. The multiplier-divider comprises a sawtooth wave generator and a comparator, wherein the sawtooth wave generator is used for generating a sawtooth wave signal according to the second input voltage; the comparator is used for comparing the sawtooth wave signal with the first input voltage to generate a comparison signal; and the comparison signal is used for controlling that a capacitor is charged by the input current to generate capacitor voltage with promotional relation with the output voltage. The method comprises the following steps of: generating the sawtooth wave signal of which the period is inversely proportional to the second output voltage according to the second input voltage; comparing the sawtooth wave signal with the first input voltage to generate the comparison signal; charging the first capacitor by the input current according to the comparison signal to generate the capacitor voltage which has promotional relation with the output voltage; and controlling the first capacitor to discharge according to a clear signal.
Description
Technical field
The present invention relates to a kind of multiplier-divider and method thereof.
Background technology
Traditional multiplier-divider is by bipolarity junction transistor (Bipolar Junction Transistor; BJT) form, therefore many shortcomings that cause from BJT are arranged.For example, BJT has high-temperature coefficient, so the output of the multiplier-divider of its composition also is subjected to Temperature Influence; BJT has high-gain, so the slight distortion of the input signal of the multiplier-divider of its composition all may impact the output of multiplier-divider, thereby the noise resisting ability of this multiplier-divider is relatively poor; The linear operation scope of BJT is narrower, thereby has limited the scope of input signal of the multiplier-divider of its composition.
U.S. Patent number 6,812,769 propose a kind of multiplier-divider that need not to use BJT, though eliminated the shortcoming that BJT causes, but need complicated circuit, and the cycle of its sawtooth signal fix, the maximal value of sawtooth signal is proportional to the divisor input signal, also needs pulse generator to provide extra pulse signal to sawtooth generator.Such circuit relatively lacks flexibility on using, size is big, cost is higher.
Summary of the invention
Being of fundamental purpose of the present invention provides a kind of and need not to use BJT, elasticity is big and simple multiplier-divider of circuit and method thereof.
According to the present invention, a kind of in order to input current be multiply by first input voltage produces output voltage divided by second input voltage multiplier-divider, comprise that sawtooth generator provides the cycle to be inversely proportional to the sawtooth signal of this second input voltage, comparer is this sawtooth signal and this first input voltage and produce comparison signal relatively, first switch is subjected to this comparison signal control to make this input current produce the capacitance voltage that has proportionate relationship with this output voltage to the electric capacity charging, and second switch is subjected to clear signal control and makes this capacitor discharge.
According to the present invention, a kind of in order to input current be multiply by first input voltage produces output voltage divided by second input voltage method, comprise that the generation cycle is inversely proportional to the sawtooth signal of this second input voltage, relatively this sawtooth signal and this first input voltage and produce comparison signal, charging produces the capacitance voltage that has proportionate relationship with this output voltage to electric capacity to make this input current according to this comparison signal, and controls this capacitor discharge according to clear signal.
Multiplier-divider of the present invention need not to use BJT, therefore not only helps cmos circuit, also has the preferable linearity and reaches noise resisting ability, and be not vulnerable to Temperature Influence.
Description of drawings
Fig. 1 is according to multiplier-divider of the present invention;
Fig. 2 is the embodiment of the sawtooth generator among Fig. 1;
Fig. 3 is the embodiment of the current source among Fig. 2;
Fig. 4 is the embodiment of the pulse generator among Fig. 1; And
Fig. 5 is the oscillogram of Fig. 1.
Embodiment
Below in conjunction with Figure of description the specific embodiment of the present invention is done detailed description.
As shown in Figure 1, multiplier-divider 10 according to the present invention is in order to produce output voltage from input current IA and input voltage VB and VC
VOUT=k (IA * VB ÷ VC), [formula 1]
Wherein k is a scale-up factor.In multiplier-divider 10, sawtooth generator 12 produces sawtooth signal Vsaw according to input voltage VC, comparer 14 is input voltage VB and sawtooth signal Vsaw generation comparison signal Sc relatively, pulse generator 16 produces clear signal CLR and sampled signal SMP according to comparison signal Sc, switch SW 1 is connected between input end IA and the capacitor C 2, be controlled by comparison signal Sc, switch SW 2 is in parallel with capacitor C 2, be controlled by clear signal CLR, sampling and holding circuit 18 are according to the voltage VM sampling generation output voltage VO UT of sampled signal SMP to capacitor C 2.In sampling and holding circuit 18, operational amplifier 20 is connected into the voltage follower device, and the positive input terminal of operational amplifier 20 connects capacitor C 2, and switch SW 3 is connected between the output terminal and capacitor C 1 of operational amplifier 20, is controlled by sampled signal SMP.
With U.S. Patent number 6,812,769 compare, and sawtooth generator 12 does not need extra pulse signal control, so circuit is simpler, and input end is also less; Pulse generator 16 utilizes the comparison signal Sc in control capacitance C2 duration of charging to produce clear signal CLR and sampled signal SMP, directly know the time that capacitor C 2 chargings finish, therefore only need simple logical circuit, and pulse generator 16 need not to provide pulse signal to sawtooth generator 12, therefore circuit is simpler, and output terminal is also less; The signal Sc of gauge tap SW1 is by sawtooth signal Vsaw decision, and is irrelevant with pulse generator 16, so circuit is simpler.
The operating principle of sawtooth generator 12 is as pierce circuit.Fig. 2 is the embodiment of sawtooth generator 12, wherein current source 22 produces charging current Iosc according to input voltage VC, switch SW 4 is connected between current source 22 and the capacitor C osc, switch SW 5 is in parallel with capacitor C osc, charging signals S2 and discharge signal S3 be gauge tap SW4 and SW5 discharging and recharging with control capacitance Cosc respectively, comparer 24 is the voltage Vsaw of capacitor C osc and reference value VTH and produce comparison signal S1 relatively, phase inverter 26 anti-phase comparison signal S1 produce discharge signal S3, phase inverter 28 anti-phase discharge signal S3 produce charging signals S2, and the voltage Vsaw that takes out from capacitor C osc is sawtooth signal.Fig. 3 is the embodiment of current source 22, and wherein operational amplifier 30, transistor M1 and resistance R osc form voltage current adapter 31, and VC converts electric current to input voltage
Ic=VC/Rosc, [formula 2]
Fig. 4 is the embodiment of pulse generator 16, it comprise a plurality of series connection phase inverter 34～46 and two and the door 48 and 50, comparison signal Sc produces signal VR, VRB, S4 and S5 after phase inverter 34～46 postpones and be anti-phase, produce sampled signal SMP with door 48 according to signal VR and S4, produce clear signal CLR according to signal VRB and S5 with door 50.
Fig. 5 is the oscillogram of Fig. 1, and wherein waveform 52 is the reference value VTH among Fig. 2, and waveform 54 is sawtooth signal Vsaw, and waveform 56 is input voltage VB.With reference to Fig. 1 and Fig. 5, during time t1 to t2, sawtooth signal Vsaw is lower than input voltage VB, makes input current IA to capacitor C 2 chargings so comparison signal Sc opens (turn on) switch SW 1; When time t2, sawtooth signal Vsaw is greater than input voltage VB, so comparison signal Sc closes (turn off) switch SW 1, simultaneously sampled signal SMP opens switch SW 3 and to the voltage VM sampling of capacitor C 2; When time t3, sampled signal SMP off switch SW3 and finish sampling, simultaneously clear signal CLR opens switch SW 2 and makes capacitor C 2 discharges.
With reference to Fig. 2 and Fig. 5, when sawtooth signal Vsaw rose to reference value VTH, switch SW 4 made capacitor C osc discharge for open circuit, switch SW 5 for closed circuit, so the maximal value of sawtooth signal Vsaw is not subjected to the restriction of input voltage VC by reference value VTH decision.System designer can change the setting value of reference value VTH easily, to adjust the maximal value of sawtooth signal Vsaw.When reference value VTH was certain setting value, the maximal value of sawtooth signal Vsaw was fixed, and was not subjected to the influence of any input signal.The cycle of reference value VTH, charging current Iosc and capacitor C osc decision sawtooth signal Vsaw
Tosc=Cosc * VTH/Iosc, [formula 3]
Its non-definite value.Suppose that the electric current I c among Fig. 3 equals charging current Iosc, then charging current
Iosc＝Ic
=VC/Rosc, [formula 4]
Formula 4 substitution formula 3 are obtained the cycle of sawtooth signal Vsaw
Tosc=Cosc * Rosc * VTH/VC [formula 5]
VC is inversely proportional to input voltage.With reference to Fig. 1 and Fig. 5, suppose that it is Ton that comparison signal Sc makes the time of switch SW 1 conducting, then the voltage of capacitor C 2
VM＝IA×Ton/C2。[formula 6]
By the waveform 52,54 and 56 of Fig. 5 as can be known
Ton/Tosc=VB/VTH, [formula 7]
So obtain
Ton=Tosc * VB/VTH, [formula 8]
Ton=VB * Cosc/Iosc, [formula 9]
Formula 4 substitution formula 9 are obtained
Ton=(Rosc * Cosc) * (VB/VC), [formula 10]
Formula 10 substitution formula 6 are obtained
VM＝(Rosc×Cosc/C2)×(IA×VB/VC)。[formula 11]
Again
VOUT=VM, [formula 12]
So output voltage
VOUT＝[(Rosc×Cosc/C2)×(IA×VB/VC)]
＝k(IA×VB÷VC)。[formula 13]
For system designer, the circuit of this multiplier-divider 10 has higher elasticity.
More than; only be preferred embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claim was defined.
Claims (10)
1. a multiplier-divider produces output voltage in order to input current be multiply by first input voltage divided by second input voltage, it is characterized in that this multiplier-divider comprises:
Sawtooth generator produces sawtooth signal according to this second input voltage, and the cycle of this sawtooth signal and this second input voltage are inversely proportional to;
Comparer connects this sawtooth generator, relatively this sawtooth signal and first input voltage and produce first comparison signal;
First electric capacity;
First switch connects this comparer and first electric capacity, makes this input current produce the capacitance voltage that has proportionate relationship with this output voltage to this first electric capacity charging according to this first comparison signal; And
Second switch, in parallel with this first electric capacity, make this first capacitor discharge according to clear signal.
2. multiplier-divider as claimed in claim 1 is characterized in that, this sawtooth generator comprises:
Current source is in response to this second input voltage decision charging current;
Second electric capacity is in order to provide this sawtooth signal;
The 3rd switch is connected between this current source and second electric capacity, makes this charging current to this second electric capacity charging in response to charging signals;
The 4th switch, in parallel with this second electric capacity, make this second capacitor discharge in response to discharge signal; And
Second comparer connects this second electric capacity, relatively this sawtooth signal and reference value and produce second comparison signal to determine this charging and discharge signal;
Wherein, this reference value determines the maximal value of this sawtooth signal.
3. multiplier-divider as claimed in claim 1 is characterized in that, comprises that more sampling and holding circuit connect this first electric capacity, according to sampled signal this capacitance voltage sampling is produced this output voltage.
4. multiplier-divider as claimed in claim 3 is characterized in that, comprises that more pulse generator connects this first comparer, second and closes pass and sampling and holding circuit, produces this clear signal and sampled signal according to this first comparison signal.
5. multiplier-divider as claimed in claim 4 is characterized in that, this pulse generator comprises:
The phase inverter of a plurality of series connection connects this first comparer, in order to postpone and anti-phase this first comparison signal and produce the first, second, third and the 4th signal;
First with the door, connect this a plurality of phase inverters, produce this clear signal according to this first and second signal; And
Second with the door, connect this a plurality of phase inverters, produce this sampled signal according to the 3rd and the 4th signal.
6. one kind in order to input current be multiply by first input voltage produces output voltage divided by second input voltage method, it is characterized in that, comprising:
(a) be inversely proportional to the sawtooth signal of this second input voltage according to this second input voltage generation cycle;
(b) relatively this sawtooth signal and this first input voltage and produce comparison signal;
(c) charging produces the capacitance voltage that has proportionate relationship with this output voltage to first electric capacity to make this input current according to this comparison signal; And
(d) control this first capacitor discharge according to clear signal.
7. method as claimed in claim 6 is characterized in that, this step a comprises:
Charging current is provided;
Control this charging current according to the comparative result of this sawtooth signal and reference value second electric capacity is charged, wherein this reference value determines the maximal value of this sawtooth signal; And
Take out this sawtooth signal from this second electric capacity.
8. method as claimed in claim 7 is characterized in that, more comprises the value that determines this charging current according to this second input voltage.
9. method as claimed in claim 6 is characterized in that, this steps d comprises:
Postpone and anti-phase this comparison signal and produce first and second signal; And
Produce this clear signal according to this first and second signal.
10. method as claimed in claim 6 is characterized in that, more comprises this capacitance voltage sampling is produced this output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101567711A CN102236769A (en) | 2010-04-27 | 2010-04-27 | Multiplier-divider and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101567711A CN102236769A (en) | 2010-04-27 | 2010-04-27 | Multiplier-divider and method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102236769A true CN102236769A (en) | 2011-11-09 |
Family
ID=44887410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101567711A Pending CN102236769A (en) | 2010-04-27 | 2010-04-27 | Multiplier-divider and method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102236769A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106105034A (en) * | 2014-04-16 | 2016-11-09 | 密克罗奇普技术公司 | Slope generation module |
| KR101737514B1 (en) | 2015-12-08 | 2017-05-19 | 한국항공우주연구원 | Divider using analog circuit |
| US11307053B2 (en) | 2020-02-04 | 2022-04-19 | Samsung Electro-Mechanics Co., Ltd. | Device with position detection |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1836204A (en) * | 2003-08-12 | 2006-09-20 | 崇贸科技股份有限公司 | Switched charge multiplier-divider |
| US20060273769A1 (en) * | 2005-06-03 | 2006-12-07 | Richtek Technology Corp. | Pulse modulation system with nonlinear ramp |
| US20080062731A1 (en) * | 2006-09-07 | 2008-03-13 | Richtek Technology Corp. | Duty feed forward method and apparatus for modulating a duty of a pmw signal and power converting method and power converter using the same |
| US20080222230A1 (en) * | 2007-03-07 | 2008-09-11 | Spi Electronic Co., Ltd. | Multiplier-divider having error offset function |
| CN101292415A (en) * | 2005-10-09 | 2008-10-22 | 崇贸科技股份有限公司 | Apparatus and method for measuring output current from primary side of power converter |
-
2010
- 2010-04-27 CN CN2010101567711A patent/CN102236769A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1836204A (en) * | 2003-08-12 | 2006-09-20 | 崇贸科技股份有限公司 | Switched charge multiplier-divider |
| US20060273769A1 (en) * | 2005-06-03 | 2006-12-07 | Richtek Technology Corp. | Pulse modulation system with nonlinear ramp |
| CN101292415A (en) * | 2005-10-09 | 2008-10-22 | 崇贸科技股份有限公司 | Apparatus and method for measuring output current from primary side of power converter |
| US20080062731A1 (en) * | 2006-09-07 | 2008-03-13 | Richtek Technology Corp. | Duty feed forward method and apparatus for modulating a duty of a pmw signal and power converting method and power converter using the same |
| US20080222230A1 (en) * | 2007-03-07 | 2008-09-11 | Spi Electronic Co., Ltd. | Multiplier-divider having error offset function |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106105034A (en) * | 2014-04-16 | 2016-11-09 | 密克罗奇普技术公司 | Slope generation module |
| CN106105034B (en) * | 2014-04-16 | 2020-10-27 | 密克罗奇普技术公司 | Slope generation module |
| KR101737514B1 (en) | 2015-12-08 | 2017-05-19 | 한국항공우주연구원 | Divider using analog circuit |
| US11307053B2 (en) | 2020-02-04 | 2022-04-19 | Samsung Electro-Mechanics Co., Ltd. | Device with position detection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102156504B (en) | Solar-cell panel maximum power tracking device, tracking method and solar power supply device using same | |
| CN102314268B (en) | capacitive touch device | |
| CN102946129B (en) | Battery charging circuit and control method thereof | |
| CN102064703B (en) | Constant current output control device and method for switching power supply | |
| CN103699277B (en) | Touch sensing circuit and touch device | |
| TWI387185B (en) | Control device for an interleaving power factor corrector | |
| CN109327044B (en) | Power conversion circuit, inverter circuit, photovoltaic power generation system and control method thereof | |
| CN103516207A (en) | Synchronous rectifier timer for discontinuous mode DC/DC converter | |
| US20160226382A1 (en) | Control circuit for switching power converter | |
| JP2014071885A5 (en) | ||
| CN101247089B (en) | Switching Controller for Power Sharing of Paralleled Power Supplies | |
| CN103440073A (en) | Capacitance Sensing Circuit Eliminating the Effects of Parasitic Capacitance | |
| TW200306078A (en) | Analog-to-digital conversion | |
| CN102236769A (en) | Multiplier-divider and method thereof | |
| US8058912B2 (en) | Electronic device and signal generator thereof | |
| TWI444877B (en) | Capacitive touching apparatus | |
| CN106033964B (en) | Button triggers detection device and has its domestic appliance among domestic appliance | |
| CN201846236U (en) | Constant current output control device of switch power supply | |
| KR101997519B1 (en) | A touch sensing device for removing sensing errors occurred by noise from a display panel and fabrication variation | |
| CN111856260B (en) | Self-generating electric key detection circuit, self-generating electric key detection device and self-generating switch | |
| CN102865943B (en) | Time Domain Temperature Sensor | |
| CN213041958U (en) | Self-power-obtaining key detection circuit, self-power-obtaining key detection device and self-power-generating switch | |
| CN105515413B (en) | A kind of output voltage sampling circuit and method based on AC-DC converter | |
| Xing et al. | High sensitive readout circuit for capacitance touch panel with large size | |
| JP2012100366A (en) | Control circuit for switching power supply, and electronic device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111109 |