CN101610070B - Preposed amplifier and method for correcting offset voltage of same - Google Patents
Preposed amplifier and method for correcting offset voltage of same Download PDFInfo
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- CN101610070B CN101610070B CN2008101285262A CN200810128526A CN101610070B CN 101610070 B CN101610070 B CN 101610070B CN 2008101285262 A CN2008101285262 A CN 2008101285262A CN 200810128526 A CN200810128526 A CN 200810128526A CN 101610070 B CN101610070 B CN 101610070B
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Abstract
The invention relates to a preposed amplifier and a method for correcting the offset voltage of the same, wherein the preposed amplifier comprises a plurality of amplifying circuits connected in series, and at least one of the amplifying circuits connected in series comprises a differential opposite-switch circuit, a comparer and a plurality of energy storage units, wherein the differential opposite-switch circuit is provided with differential input ends and differential output ends; the comparer is used for comparing potentials of the differential output ends to output comparison signals; and the energy storage units are singly and selectively coupled with one of the differential output ends according to the comparison signals to regulate the potentials of the differential output ends. Besides, the invention also discloses the method for correcting the offset voltage of the preposed amplifier.
Description
Technical field
The present invention relates to the amplifying circuit in a kind of receiver, and particularly relate to preamplifier and the method for middle calibrated offset voltage thereof in a kind of receiver.
Background technology
For the preamplifier in the general receiver, it is made up of the amplifying circuit of several grades of series connection usually, uses input signal is amplified in regular turn.Specifically, elder generation inputs to the differential wave of small-signal in the preamplifier usually, through the amplifying circuit of wherein connecting it is amplified in regular turn then, and then becomes the differential wave of large-signal, uses for subsequent conditioning circuit.
Yet in preamplifier, the amplifying circuit of each grade all has more or less offset voltage in wherein, makes amplifying circuit export and has different common voltage level between the differential wave of amplifying.Thus, export and the differential wave of amplifying just possibly have the work period problem of (duty cycle) distortion by preamplifier, and use its correcting deviation tolerance of receiver (skew tolerance) of this preamplifier also possibly therefore lower.
Summary of the invention
The object of the present invention is to provide the method for a kind of preamplifier and middle calibrated offset voltage thereof, use to improve and amplify the differential wave of output afterwards.
According to one embodiment of the invention, a kind of preamplifier is proposed.This preamplifier comprises the amplifying circuit of a plurality of series connection, and the amplifying circuit of series connection one of them comprises one differential to switching circuit, a comparator and a plurality of energy storage unit at least.Differential have pair of differential input and pair of differential output to switching circuit.Comparator is in order to compare the current potential of differential output end, to export a comparison signal.Energy storage unit according to comparison signal distinctly and optionally be coupled to differential output end one of them, with the adjustment differential output end current potential.
According to another embodiment of the present invention, propose a kind of in preamplifier the method for calibrated offset voltage.The method comprises: one differentially compares the current potential of one of switching circuit to differential output end each other at least one of amplifying circuit that will a plurality of series connection in preamplifier, to export a comparison signal; And according to comparison signal with a plurality of energy storage units distinctly and optionally be coupled to differential output end one of them, with the adjustment differential output end current potential.
According to technology contents of the present invention; The method of application of aforementioned preamplifier and middle calibrated offset voltage thereof can be removed offset voltage wherein; Make to have identical common voltage level between differential wave after the amplification that preamplifier exports, and the problem that the correcting deviation tolerance of work period distortion and receiver lowers is able to also solve.
Description of drawings
Fig. 1 shows the sketch map according to a kind of preamplifier of the embodiment of the invention.
Fig. 2 shows the sketch map of circuit in a kind of amplifying circuit as shown in Figure 1 according to the embodiment of the invention.
Fig. 3 and Fig. 4 show the flow chart according to the embodiment of the invention a kind of method of calibrated offset voltage in preamplifier.
The reference numeral explanation
100: preamplifier
102: amplifying circuit
200: differential to switching circuit
202: comparator
300～318: step
Embodiment
Fig. 1 shows the sketch map according to a kind of preamplifier of the embodiment of the invention.Preamplifier 100 comprises the amplifying circuit 102 of several grades (as: N level) series connection, and wherein each amplifying circuit 102 all can be a CML (current mode logic, CML) circuit.Little differential wave VIP and VIN input in the 1st grade the amplifying circuit 102, and are amplified by the amplifying circuit 102 of series connection in regular turn.Then, amplifying differential wave VOP later and VON is exported by the amplifying circuit 102 of N level again.
Fig. 2 shows the sketch map of main circuit in a kind of amplifying circuit as shown in Figure 1 according to the embodiment of the invention.It should be noted that in amplifying circuit shown in Figure 1 102 at this, at least wherein one can comprise circuit as shown in Figure 2.In one embodiment, circuit as shown in Figure 2 is included in the 1st grade the amplifying circuit 102, uses calibration offset voltage wherein.
Amplifying circuit 102 comprise one differential to switching circuit 200 (comprising transistor Q1, Q2, Q3 and resistance R 1, R2), a comparator 202, a plurality of energy storage unit (as: capacitor C 1, C2 ... And CN), one first switch P 1, a second switch P2 and a pair of reference energy storage element (as: capacitor C A and CB).Differential have pair of differential input (being VI1 and VI2) and pair of differential output (being N1 and N2) to switching circuit 200.Comparator 2 02 is in order to the current potential of differential output end N1 and N2 relatively, and so exports a comparison signal CMP_OUT.Capacitor C 1, C2 ... Open one with CN and to be coupled to an earth terminal (GND) under the beginning state, afterwards then according to comparison signal CMP_OUT distinctly and optionally be coupled to differential output end N1 and N2 one of them, with the current potential of adjustment differential output end N1 and N2.Wherein, capacitor C 1, C2 ... With the capacitance of CN can be designed to according to the situation of reality all identical, part is identical or even mutually different capacitance.Below for the purpose of the explanation for ease, suppose that the capacitance of all electric capacity is all identical.First switch P 1 is coupled between differential output end N1 and the N2, and when opening with differential output end N1 and N2 short circuit.Second switch P2 is coupled between differential input terminal VI1 and the VI2, and when opening with differential input terminal VI1 and VI2 short circuit.Capacitor C A and CB are respectively coupled to differential output end N1 and N2.
The operational scenario of offset voltage calibration in the preamplifier below will be described with an embodiment.At first, make differential output end N1 and N2 short circuit if first switch P 1 is opened, then comparator 202 can be according to itself existingly exporting comparison signal CMP_OUT from skew (self-offset) voltage in the comparator 202.At this moment; Capacitor C 1, C2 ... With CN can be according to comparison signal CMP_OUT; Distinctly and optionally be coupled to differential output end N1 and N2 one of them, use the current potential of adjustment differential output end N1 and N2, and thereby calibration comparator 202 in existing oneself voltage that squints itself.
Then, second switch P2 opens if first switch P 1 is closed, and makes differential input terminal VI1 and VI2 short circuit, and then comparator 202 can be exported comparison signal CMP_OUT according to the skew between differential output end N1 and the N2 (offset) voltage.At this moment; Capacitor C 1, C2 ... with CN can according to comparison signal CMP_OUT distinctly and optionally be coupled to differential output end N1 and N2 one of them; Use the current potential of adjusting differential output end N1 and N2 once more, and thereby calibration differential output end N1 and N2 between offset voltage.
For instance, if the current potential of differential output end N1 greater than the current potential of differential output end N2, then capacitor C 1, C2 ... And CN (or wherein several) can switch according to comparison signal CMP_OUT and be coupled to differential output end N1.Therefore, by following equality:
CA×V(N1)+CB×V(N2)＝(CA+C1+…)×V(N1*)+CB×V(N2)
Can learn that differential output end N1 adjustment current potential (being V (N1*)) later is less than its original current potential.In other words, the current potential of differential output end N1 can change according to the number that is coupled to the electric capacity of differential output end N1.
Afterwards, when first switch P 1 was all closed with second switch P2, then differential wave was more respectively by differential input terminal VI1 and VI2 input.At this moment, because the current potential of differential output end N1 and N2 calibrated by above-mentioned step, therefore from differential output N1 and N2 output and between the differential wave of amplification, it is poor just no longer to have an offset voltage.
Fig. 3 and Fig. 4 show the flow chart according to the embodiment of the invention a kind of method of calibrated offset voltage in preamplifier.Please be simultaneously with reference to figure 2,3 and 4.At first, with differential output end N1 and N2 short circuit (step 300).Then, through comparator 202 current potential of differential output end N1 and N2 is compared (step 302) each other.Afterwards, according to own existing in the comparator 202 from the voltage output comparison signal CMP_OUT (step 304) that squints.Then, according to comparison signal CMP_OUT, will open capacitor C 1 that the beginning state is coupled to earth terminal, C2 ... And CN, distinctly and optionally be coupled to differential output end N1 and N2 one of them (step 306), use the current potential of adjustment differential output end N1 and N2.Then, again through above-mentioned with capacitor C 1, C2 ... With CN distinctly and optionally be coupled to differential output end N1 and N2 one of them, to itself existingly calibrating (step 308) in the comparator 202 from the voltage that squints.Wherein, can respectively capacitor C A and CB be coupled to differential output end N1 and N2, make differential output end N1 and N2 open the beginning current potential can be stored in separately among capacitor C A and the CB.
Moreover, with differential input terminal VI1 and VI2 short circuit (step 310).Then, through comparator 202 current potential of differential output end N1 and N2 is compared (step 312) each other.Afterwards, according to the output of the offset voltage between differential output end N1 and N2 comparison signal CMP_OUT (step 314).Then, once more according to comparison signal CMP_OUT, with capacitor C 1, C2 ... Distinctly and optionally be coupled to differential output end N1 and N2 one of them (step 316) with CN, use the current potential of adjusting differential output end N1 and N2 once more.Then, through above-mentioned with capacitor C 1, C2 ... With CN distinctly and optionally be coupled to differential output end N1 and N2 one of them, the offset voltage between differential output end N1 and the N2 is calibrated (step 318).Thus, from differential output N1 and N2 output and between the differential wave after amplifying, it is poor just no longer to have an offset voltage.
Embodiment by the invention described above can know, the method for application of aforementioned preamplifier and middle calibrated offset voltage thereof can be removed offset voltage wherein, makes between differential wave after the amplification that preamplifier exports to have identical common voltage level.In addition; The receiver of the method for application of aforementioned preamplifier and middle calibrated offset voltage thereof; The work period (duty cycle) that wherein determines according to the differential wave after amplifying does not have the problem of distortion, and receiver also can keep good correcting deviation tolerance (skew tolerance).
Though the present invention discloses as above with embodiment; But it is not in order to qualification the present invention, those skilled in the art, under the premise without departing from the spirit and scope of the present invention; When can doing some changes and modification, so protection scope of the present invention should be as the criterion with claim of the present invention.
Claims (15)
1. preamplifier comprises:
The amplifying circuit of a plurality of series connection, the amplifying circuit of said series connection one of them comprises at least:
One is differential to switching circuit, has pair of differential input and pair of differential output;
One comparator, in order to relatively this to the current potential of differential output end, to export a comparison signal; And
A plurality of energy storage units, according to this comparison signal distinctly and optionally be coupled to this to differential output end one of them, adjusting this current potential to differential output end,
Wherein said energy storage unit opens one and is coupled to an earth terminal under the beginning state.
2. preamplifier as claimed in claim 1 also comprises:
One first switch is coupled to this between the differential output end, and when opening with this to the differential output end short circuit.
3. preamplifier as claimed in claim 2, wherein when this during to the differential output end short circuit, this comparator according to one in this comparator from this comparison signal of voltage output that squints.
4. preamplifier as claimed in claim 3, wherein said energy storage unit according to this comparison signal distinctly and optionally be coupled to this to differential output end one of them, to calibrate in this comparator this from the voltage that squints.
5. preamplifier as claimed in claim 1 also comprises:
One second switch is coupled to this between the differential input terminal, and when opening with this to the differential input terminal short circuit.
6. preamplifier as claimed in claim 5, wherein when this during to the differential input terminal short circuit, this comparator according to this to this comparison signal of the output of the offset voltage between differential output end.
7. preamplifier as claimed in claim 6, wherein said energy storage unit according to this comparison signal distinctly and optionally be coupled to this to differential output end one of them, to calibrate this to this offset voltage between differential output end.
8. preamplifier as claimed in claim 1 also comprises:
A pair of reference energy storage element is coupled to this to differential output end.
9. preamplifier as claimed in claim 1, wherein each said amplifying circuit is a current mode logic circuits.
10. preamplifier as claimed in claim 1, wherein each said energy storage unit is an electric capacity.
11. the method for a calibrated offset voltage in preamplifier comprises:
Current potential of a differential pair of differential output to switching circuit compares each other at least one of amplifying circuit that will a plurality of series connection in this preamplifier, to export a comparison signal; And
According to this comparison signal with a plurality of energy storage units distinctly and optionally be coupled to this to differential output end one of them, adjusting this current potential to differential output end,
Wherein open under the beginning state said energy storage unit is coupled to an earth terminal one.
12. method as claimed in claim 11 is wherein carried out to the step that the current potential of differential output end compares each other this through a comparator.
13. method as claimed in claim 12 also comprises:
With this to the differential output end short circuit;
Export this comparison signal according to one in this comparator from the voltage that squints; And
Through said energy storage unit distinctly and optionally is coupled to this to differential output end one of them, calibrate in this comparator this from the voltage that squints.
14. method as claimed in claim 11 also comprises:
With this differential pair of differential input short circuit to switching circuit;
According to this offset voltage between differential output end is exported this comparison signal; And
Through said energy storage unit distinctly and optionally is coupled to this to differential output end one of them, calibrate this to this offset voltage between differential output end.
15. method as claimed in claim 11 also comprises:
A pair of reference energy storage element is coupled to this to differential output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101285262A CN101610070B (en) | 2008-06-19 | 2008-06-19 | Preposed amplifier and method for correcting offset voltage of same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101285262A CN101610070B (en) | 2008-06-19 | 2008-06-19 | Preposed amplifier and method for correcting offset voltage of same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101610070A CN101610070A (en) | 2009-12-23 |
| CN101610070B true CN101610070B (en) | 2012-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101285262A Expired - Fee Related CN101610070B (en) | 2008-06-19 | 2008-06-19 | Preposed amplifier and method for correcting offset voltage of same |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5427658B2 (en) * | 2010-03-16 | 2014-02-26 | パナソニック株式会社 | Comparator offset correction device |
| CN103066936B (en) * | 2012-12-25 | 2015-08-19 | 清华大学深圳研究生院 | A kind of prime amplifier is by controlling the offset correction method of time delay |
| CN103107786B (en) * | 2012-12-25 | 2015-09-02 | 清华大学深圳研究生院 | A kind of prime amplifier is by the offset correction method of span of control limit of control |
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