CN104467859A - Mixed signal feedback error sampling circuit and method - Google Patents
Mixed signal feedback error sampling circuit and method Download PDFInfo
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- CN104467859A CN104467859A CN201410609820.0A CN201410609820A CN104467859A CN 104467859 A CN104467859 A CN 104467859A CN 201410609820 A CN201410609820 A CN 201410609820A CN 104467859 A CN104467859 A CN 104467859A
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Abstract
The invention discloses a mixed signal feedback error sampling circuit and method. Rectified error current signals flow through a sampling resistor, pressure drops for representing the error current signals are generated on the sampling resistor accordingly, and it is equivalent that the error current signals are amplified; as the current direction is changed in the rectification process, and consideration needs to be given during actual error signal processing, so that current direction signals for representing the current direction are obtained through a current direction judgment circuit; the amplified error current signals are input into a high-accuracy analog-digital converter to generate digital error signals, so that the requirement for the accuracy of the analog-digital converter is reduced, namely the number of analog-digital converter bits for achieving the same accuracy is decreased.
Description
Technical field
The present invention relates to electric and electronic technical field, be specifically related to a kind of mixed signal feedback error sample circuit and method.
Background technology
In a closed-loop system, need to sample to feedback signal, carry out FEEDBACK CONTROL by feedback signal.In digital-to-analogue mixed signal closed-loop system; input is general adopts a high-precision adc (ADC); the analog signal of input is converted into the digital signal that can characterize corresponding simulation input variable size through high-precision adc, then compares to produce compensating signal with digital reference signal.
As shown in Figure 1, the mixed signal feedback error sample circuit of prior art is illustrated.Input analog signal V
fBto analog to digital converter (ADC), the internal reference of analog to digital converter is AD_ref, multistation digital signal V [n] is produced through analog-to-digital conversion, and compare with long number reference signal R [n], produce the digital signal E [n] characterizing its difference, compensated digital signal E [n] by digital compensator, form signal P [n], signal P [n] is converted into final analog feedback signal V through digital to analog converter again
c, by analog feedback signal V
ccarry out feeding back thus realizing FEEDBACK CONTROL.
In above-mentioned prior art, the closed-loop precision of the high-precision adc of a n position is AD_ref/ (2
n-1), AD_ref is the reference voltage of analog to digital converter inside.Therefore, require higher to precision of A/D converter, required figure place is more, therefore also higher for the requirement of the performance of ADC, adds the design of circuit, production cost.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of mixed signal feedback error sample circuit and method, the figure place of analog to digital converter can be reduced under same precision.
Technical solution of the present invention is, provides a kind of mixed signal feedback error sample circuit of following structure, comprises rectification circuit, sense of current decision circuitry and analog to digital converter, original sampled signal and reference signal are compared and obtain error current signal;
The input of described rectification circuit receives error current signal; The input of described rectification circuit is connected to the first input end of sense of current decision circuitry, the second input access reference voltage of sense of current decision circuitry, and sense of current decision circuitry exports the current direction signal characterizing error current sense;
Described rectification circuit exports the electric current after rectification, flows through sampling resistor; Sampling resistor is formed the pressure drop characterizing error current signal, and the pressure drop input analog-to-digital converter of described sign error current signal, exports the first digital error signal after analog-to-digital conversion.
Preferably, described rectification circuit comprises the first switching tube, second switch pipe, the first current mirror and the second current mirror, the first described switching tube and the series connection of second switch pipe, the first end of the first switching tube is connected with the first end of second switch pipe, second end of described first switching tube is connected with the input of the first current mirror, second end of described second switch pipe is connected with the input of the second current mirror, and the output of described second current mirror is connected with the common port of the first switching tube and the first current mirror; The common port of the first switching tube and second switch pipe is as the input of rectification circuit, and described error current signal accesses the common port of the first switching tube and second switch pipe, according to direction conducting first switching tube or the second switch pipe of error current signal; The first input end of described sense of current decision circuitry accesses the common port of the first switching tube and second switch pipe.
Preferably, described error sample circuit also comprises digital compensator and digital to analog converter, described digital compensator receives described first digital error signal and current direction signal, the second digital error signal is exported after digital compensator process, described digital to analog converter receives the second digital error signal, and exports analog error signal after carrying out digital-to-analogue conversion to it.
Preferably, the first described switching tube and the control end of second switch pipe access same control signal, the equal and opposite in direction of described control signal and described reference signal.
Preferably, described error current signal produces by after original sampled signal and the process of reference signal error originated from input amplifier.
Another technical solution of the present invention is, provides a kind of mixed signal feedback error method of sampling of following structure, comprises the following steps:
The original sampled signal obtained sampling and reference signal compare and obtain error current signal;
By rectification circuit, rectification is carried out to described error current signal, error current signal after rectification flows through sampling resistor, sampling resistor produces the pressure drop characterizing error current signal, the pressure drop input analog-to-digital converter of described sign error current signal, exports the first digital error signal after analog-to-digital conversion;
The current direction signal characterizing the sense of current is obtained according to the sense of current of described error current signal;
Described digital compensator receives described first digital error signal and current direction signal, the second digital error signal is exported after digital compensator process, described digital to analog converter receives the second digital error signal, and exports analog error signal after carrying out digital-to-analogue conversion to it.
Preferably, described rectification circuit comprises the first switching tube, second switch pipe, the first current mirror and the second current mirror, the first described switching tube and the series connection of second switch pipe, the first end of the first switching tube is connected with the first end of second switch pipe, second end of described first switching tube is connected with the input of the first current mirror, second end of described second switch pipe is connected with the input of the second current mirror, and the output of described second current mirror is connected with the common port of the first switching tube and the first current mirror; The common port of the first switching tube and second switch pipe is as the input of rectification circuit, and described error current signal accesses the common port of the first switching tube and second switch pipe, according to direction conducting first switching tube or the second switch pipe of error current signal.
Adopt circuit structure of the present invention and method, compared with prior art, have the following advantages: flow through sampling resistor by after error current signal rectification, thus on sampling resistor, produce the pressure drop characterizing error current signal, be equivalent to amplify process to error current signal, owing to changing the sense of current in switching process, and need when actual error signal transacting to consider, therefore obtain by the sense of current decision circuitry current direction signal characterizing the sense of current, error current signal input high-precision adc after amplifying process is to produce digital error signal, because this reducing the requirement to precision of A/D converter, namely the figure place reaching analog to digital converter needed for same accuracy reduces.
Accompanying drawing explanation
Fig. 1 is the structural representation of the mixed signal feedback error sample circuit of prior art;
Fig. 2 is the structural representation of the mixed signal feedback error sample circuit of the present invention;
Fig. 3 is the schematic diagram that original sampled signal and reference signal produce error current signal.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail, but the present invention is not restricted to these embodiments.The present invention contain any make in the spirit and scope of the present invention substitute, amendment, equivalent method and scheme.
To have the present invention to make the public and understand thoroughly, in the following preferred embodiment of the present invention, describe concrete details in detail, and do not have the description of these details also can understand the present invention completely for a person skilled in the art.
In the following passage, more specifically the present invention is described by way of example with reference to accompanying drawing.It should be noted that, accompanying drawing all adopts the form that comparatively simplifies and all uses non-ratio accurately, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.
Core of the present invention is, provides a kind of mixed signal feedback error sample circuit, comprising:
Comprise rectification circuit, sense of current decision circuitry and analog to digital converter, original sampled signal and reference signal are compared and obtains error current signal;
The input of described rectification circuit receives error current signal; The input of described rectification circuit is connected to the first input end of sense of current decision circuitry, the second input access reference voltage of sense of current decision circuitry, and sense of current decision circuitry exports the current direction signal characterizing error current sense;
Described rectification circuit exports the electric current after rectification, flows through sampling resistor; Sampling resistor is formed the pressure drop characterizing error current signal, and the pressure drop input analog-to-digital converter of described sign error current signal, exports the first digital error signal after analog-to-digital conversion.
On the other hand, a kind of mixed signal feedback error method of sampling is provided, comprises the following steps:
The original sampled signal obtained sampling and reference signal compare and obtain error current signal;
By rectification circuit, rectification is carried out to described error current signal, error current signal after rectification flows through sampling resistor, sampling resistor produces the pressure drop characterizing error current signal, the pressure drop input analog-to-digital converter of described sign error current signal, exports the first digital error signal after analog-to-digital conversion;
The current direction signal characterizing the sense of current is obtained according to the sense of current of described error current signal;
Described digital compensator receives described first digital error signal and current direction signal, the second digital error signal is exported after digital compensator process, described digital to analog converter receives the second digital error signal, and exports analog error signal after carrying out digital-to-analogue conversion to it.
For detail and the preferred version of embodiment, describe in detail in conjunction with the following drawings:
Shown in figure 2, illustrate mixed signal feedback error sample circuit.I
efor error current signal, error current signal I
eby the original sampled signal V obtained that samples
fBwith reference signal V
rEFcompare generation.Rectification circuit comprises the first switching tube N, second switch pipe P, the first current mirror 201 and the second current mirror 202.At error current signal I
ethe sense of current be positive direction (with Fig. 2 display from bottom to top for positive direction) time, now error current signal I
emake second switch pipe P conducting, and flow to the first current mirror 201 through the second current mirror 202, export the electric current after rectification from the first current mirror 201.At error current signal I
esense of current when being negative direction, error current signal I
ethen toward pumpback electricity, make the first switching tube N conducting, and flow to the first current mirror 201, export the electric current after rectification from the first current mirror 201.By above-mentioned rectification, no matter error current signal I
edirection be just or be negative, the first current mirror 201 output the sense of current unanimously, thus to achieve error current signal I
erectification, and produce pressure drop VE on sampling resistor R, described pressure drop VE can characterize error current signal I
esize.VE=(V
rEF-V
fB) gmR, I
e=(V
rEF-V
fB) gm, gm be the gain of error amplifier, so, by resistance R by error current signal I
ebe exaggerated, error is exaggerated, then then reduce the required precision of analog to digital converter, and the figure place reached needed for same accuracy reduces.For example, under the prior art, to reach the feedback accuracy of 1mv, the reference voltage AD_ref of analog to digital converter inside is 1.25V, then 1.25V/ (2
n-1) <1mv, then n is minimum is 11, and namely analog to digital converter at least needs 11, and adopts the present invention, makes gmR=16,1.25V/ (2n-1) < (16x1) mv, then n is minimum is 7.
Sense of current decision circuitry can adopt comparator COMP, its in-phase end is connected on the common port of the first switching tube N (adopting N-type metal-oxide-semiconductor) and second switch pipe P (adopting P type metal-oxide-semiconductor), when second switch pipe P conducting, then the voltage of described common port is greater than the control signal V of second switch pipe P
dD/ 2, the signal that the end of oppisite phase due to comparator COMP accesses equals control signal V
dD/ 2, then the current direction signal Sign that now comparator COMP exports is 1, and characterizing the now sense of current is just; Otherwise then Sign is 0, it is negative for characterizing the now sense of current.
Sampling resistor R is formed described pressure drop VE and inputs to analog to digital converter, after analog-to-digital conversion, export digital error signal E [n], digital error signal E [n] inputs digital compensator together with current direction signal Sign, current direction signal Sign is as the sign bit of process, after digital compensator process, output signal P [n] to digital to analog converter, be converted into analog signal, obtain analog error signal V
c.
Shown in figure 3, illustrate the generation of current error signal.By original sampled signal V
fBthe in-phase end of error originated from input amplifier EA, reference signal V
rEFthe end of oppisite phase of error originated from input amplifier EA, by producing error current signal I after Error processing
e, error current signal I
efor current source, the gain of error amplifier is gm.The present embodiment adopts mutual conductance error amplifier.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The amendment done within any spirit at above-mentioned execution mode and principle, equivalently to replace and improvement etc., within the protection range that all should be included in this technical scheme.
Claims (7)
1. a mixed signal feedback error sample circuit, is characterized in that: comprise rectification circuit, sense of current decision circuitry and analog to digital converter, original sampled signal and reference signal is compared and obtains error current signal;
The input of described rectification circuit receives error current signal; The first input end of sense of current decision circuitry is connected with the input of described rectification circuit, the second input access reference voltage of sense of current decision circuitry, and sense of current decision circuitry exports the current direction signal characterizing error current sense;
Described rectification circuit exports the electric current after rectification, flows through sampling resistor; Sampling resistor is formed the pressure drop characterizing error current signal, and the pressure drop input analog-to-digital converter of described sign error current signal, exports the first digital error signal after analog-to-digital conversion.
2. mixed signal feedback error sample circuit according to claim 1, it is characterized in that: described rectification circuit comprises the first switching tube, second switch pipe, first current mirror and the second current mirror, the first described switching tube and the series connection of second switch pipe, the first end of the first switching tube is connected with the first end of second switch pipe, second end of described first switching tube is connected with the input of the first current mirror, second end of described second switch pipe is connected with the input of the second current mirror, the output of described second current mirror is connected with the common port of the first switching tube and the first current mirror, the common port of the first switching tube and second switch pipe is as the input of rectification circuit, and described error current signal accesses the common port of the first switching tube and second switch pipe, according to direction conducting first switching tube or the second switch pipe of error current signal, the first input end of described sense of current decision circuitry accesses the common port of the first switching tube and second switch pipe.
3. mixed signal feedback error sample circuit according to claim 1 and 2, it is characterized in that: described error sample circuit also comprises digital compensator and digital to analog converter, described digital compensator receives described first digital error signal and current direction signal, the second digital error signal is exported after digital compensator process, described digital to analog converter receives the second digital error signal, and exports analog error signal after carrying out digital-to-analogue conversion to it.
4. mixed signal feedback error sample circuit according to claim 2, is characterized in that: the first described switching tube and the control end of second switch pipe access same control signal, the equal and opposite in direction of described control signal and described reference signal.
5. mixed signal feedback error sample circuit according to claim 1 and 2, is characterized in that: described error current signal produces by after original sampled signal and the process of reference signal error originated from input amplifier.
6. a mixed signal feedback error method of sampling, is characterized in that: comprise the following steps:
The original sampled signal obtained sampling and reference signal compare and obtain error current signal;
By rectification circuit, rectification is carried out to described error current signal, error current signal after rectification flows through sampling resistor, sampling resistor produces the pressure drop characterizing error current signal, the pressure drop input analog-to-digital converter of described sign error current signal, exports the first digital error signal after analog-to-digital conversion;
The current direction signal characterizing the sense of current is obtained according to the sense of current of described error current signal;
Described digital compensator receives described first digital error signal and current direction signal, the second digital error signal is exported after digital compensator process, described digital to analog converter receives the second digital error signal, and exports analog error signal after carrying out digital-to-analogue conversion to it.
7. the mixed signal feedback error method of sampling according to claim 6, it is characterized in that: described rectification circuit comprises the first switching tube, second switch pipe, first current mirror and the second current mirror, the first described switching tube and the series connection of second switch pipe, the first end of the first switching tube is connected with the first end of second switch pipe, second end of described first switching tube is connected with the input of the first current mirror, second end of described second switch pipe is connected with the input of the second current mirror, the output of described second current mirror is connected with the common port of the first switching tube and the first current mirror, the common port of the first switching tube and second switch pipe is as the input of rectification circuit, and described error current signal accesses the common port of the first switching tube and second switch pipe, according to direction conducting first switching tube or the second switch pipe of error current signal.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070104292A1 (en) * | 2005-11-04 | 2007-05-10 | Peter Gregorius | Timing recovery phase locked loop |
| CN101471602A (en) * | 2007-12-29 | 2009-07-01 | 比亚迪股份有限公司 | Bidirectional DC power supply circuit |
| CN101867289A (en) * | 2010-05-19 | 2010-10-20 | 杭州矽力杰半导体技术有限公司 | Switch power supply with constant voltage/constant current output and control method thereof |
| CN102035555A (en) * | 2010-12-29 | 2011-04-27 | 杭州矽力杰半导体技术有限公司 | Analog digital converter, conversion method and digital power supply controller adopting analog digital converter |
-
2014
- 2014-11-03 CN CN201410609820.0A patent/CN104467859B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070104292A1 (en) * | 2005-11-04 | 2007-05-10 | Peter Gregorius | Timing recovery phase locked loop |
| CN101471602A (en) * | 2007-12-29 | 2009-07-01 | 比亚迪股份有限公司 | Bidirectional DC power supply circuit |
| CN101867289A (en) * | 2010-05-19 | 2010-10-20 | 杭州矽力杰半导体技术有限公司 | Switch power supply with constant voltage/constant current output and control method thereof |
| CN102035555A (en) * | 2010-12-29 | 2011-04-27 | 杭州矽力杰半导体技术有限公司 | Analog digital converter, conversion method and digital power supply controller adopting analog digital converter |
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