CN101995900A - Gradient voltage generator used for continuous variable gain amplifier - Google Patents
Gradient voltage generator used for continuous variable gain amplifier Download PDFInfo
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- CN101995900A CN101995900A CN 201010505772 CN201010505772A CN101995900A CN 101995900 A CN101995900 A CN 101995900A CN 201010505772 CN201010505772 CN 201010505772 CN 201010505772 A CN201010505772 A CN 201010505772A CN 101995900 A CN101995900 A CN 101995900A
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Abstract
The invention relates to a gradient voltage generator used for a continuous variable gain amplifier, which comprises a forward output circuit, an inverted output circuit, a CMOS (Complementary Metal Oxide Semiconductor) transconductance circuit and a common-mode voltage generating circuit, wherein the CMOS transconductance circuit is used for converting the input voltage into current and transferring the current to the forward output circuit and the inverted output circuit through a current mirror which is formed by respectively connecting a drain electrode of a first NMOS (N-channel metal oxide semiconductor) pipe, a drain electrode of a second NMOS pipe, a drain electrode of a first PMOS pipe in the forward output circuit and a drain electrode of a second PMOS pipe in the inverted output circuit; and the input voltage of the common-mode voltage generating circuit and the common-mode voltage of the continuous variable gain amplifier are same, and the output ends of the common-mode voltage generating circuit are respectively connected with the low voltage input ends of both the forward output circuit and the inverted output circuit. By using the COMS transcomductance circuit of the invention, the relation between the gain characteristic curve of the continuous variable gain amplifier and the VAGC (Voltage Automatic Gain Control) is more accurate, and the influence of the process, the temperature, and the voltage to the performance of the continuous variable gain amplifier is decreased to be lowest.
Description
Technical field:
The present invention relates to a kind of gradient voltage generator that is used for the continuous variable gain amplifier.
Background technology:
Fig. 1 is the basic structure of a continuous variable gain amplifier (VGA), and its core circuit is the operational amplifier (Opamp) of two cascades.Negative feedback resistor R1 and R2 have determined Amplifier Gain.Gradient voltage generator (Ramp Gen) is accepted the control voltage V from automatic gain control circuit (AGC)
AGC, and be converted into one group of control voltage and send adjustable resistance R1 and R2 to, thereby realize gain control to continuous variable gain amplifier (VGA).
VGA among Fig. 1, its one pass gain equals R2/R1.As everyone knows, most of radio-frequency receiving systems require the gain and control voltage (V of VGA
AGC) become " decibel-linearity " to concern (as Fig. 2) within the specific limits.Approximation method commonly used is to make R2/R1=(1+X)/(1-X).Easily card is when-0.6≤X≤0.6, (1+X)/(1-X) ≈ e
2X
Traditional Ramp Gen circuit is seen Fig. 3, and its basic functional principle is as follows: constant voltage (V
Ref) be a changeless voltage.As control voltage (V
AGC) variation the time, the output voltage V cp﹠amp of Ramp Gen circuit; The Vcn inverse change.This output voltage is acted on thyrite, can realize R2/R1=mentioned above (1+X)/(1-X).
The Ramp Gen circuit of traditional structure has two shortcomings usually.At first, since the body effect of M1 and M2, output voltage V cp﹠amp; Vcn and control voltage V
AGCBetween the linear relationship out of true, and be subject to the influence of technology, temperature, change in voltage.Secondly, output voltage V cp﹠amp; Vcn is defined as the voltage with respect to ground, so the R1 of VGA and R2 will change along with common-mode voltage variation among Fig. 1.
In sum, based on its gain of the VGA of traditional structure Ramp Gen circuit and control voltage V
AGCConcern out of true, be subject to the influence of technology, temperature, change in voltage, and for different common mode voltages, its gain characteristic curve is different.These problems affect the performance of VGA, reduced its practicality.
Summary of the invention:
In order to solve the problems of the technologies described above, the invention provides a kind of gradient voltage generator that is used for the continuous variable gain amplifier, realization is for the accurate control of the gain characteristic curve of VGA, thereby the performance of minimizing VGA is subjected to the influence of the variation of technology, temperature, supply voltage, common mode voltage.
The technical solution adopted for the present invention to solve the technical problems is: a kind of gradient voltage generator that is used for the gain amplifier of continuous variable, be provided with the forward output circuit, reverse output circuit, CMOS transconductance circuit and common mode voltage generative circuit, described CMOS transconductance circuit is converted into electric current with input voltage, and the drain electrode by a NMOS pipe, the drain electrode of the PMOS pipe in the drain electrode of the 2nd NMOS pipe and the forward output circuit, oppositely the drain electrode of the 2nd PMOS pipe in the output circuit connects the current mirror that is constituted respectively, this current transfer is arrived the forward output circuit, oppositely go in the output circuit, the input voltage of described common mode voltage generative circuit is identical with the common mode voltage of continuous variable gain amplifier, and its output terminal is connected to the low-voltage input end of forward output circuit and reverse output circuit respectively.
The present invention utilizes the CMOS transconductance circuit, has designed a kind of new accurate gradient voltage generator, and this gradient voltage generator is applied to the design of continuous variable gain amplifier.Make the gain characteristic curve and the V of variable gain amplifier
AGCRelation more accurate, and technology, temperature, voltage reduced to minimum to the variable gain amplifier Effect on Performance.
Description of drawings:
Fig. 1 is the basic structure of continuous variable gain amplifier.
Fig. 2 is continuous variable gain amplifier " decibel-linearity " gain characteristic curve.
Fig. 3 is the basic structure of traditional gradient voltage generator.
Fig. 4 is the basic structure of gradient voltage generator of the present invention.
Among the figure: 1, forward output circuit; 2, reverse output circuit; 3, CMOS transconductance circuit; 4, common mode voltage generative circuit; 5, NMOS pipe (M5); 6, the 2nd NMOS pipe (M6); 7, PMOS pipe; 8, the 2nd PMOS pipe; 9, output terminal; 10, the 3rd PMOS pipe (M1); 11, the 4th PMOS pipe (M2); 12, the 3rd NMOS pipe (M3); 13, the 4th NMOS pipe (M4); 14, first resistance (R1); 15, output resistance (R2).
Embodiment:
The present invention is further described below in conjunction with drawings and Examples.
As shown in Figure 4, the middle part of figure is a CMOS transconductance circuit 3.The one NMOS pipe 5 (M5) and the 2nd NMOS pipe 6 (M6) constitute current mirror, the 3rd PMOS pipe 10 (M1) and the 4th PMOS pipe 11 (M2) are that input difference is right, and the 3rd NMOS pipe 12 (M3) and the 4th NMOS pipe 13 (M4) have then constituted negative feedback loop with the 3rd PMOS pipe 10 (M1) and the 4th PMOS pipe 11 (M2).The both sides of figure are that forward output circuit 1 and reverse output circuit 2 are basic identical with the traditional structure among Fig. 3, the drain electrode of the drain electrode of its PMOS pipe (7), the 2nd PMOS pipe (8) is managed the drain electrode of (5) with a NMOS, the drain electrode of the 2nd NMOS pipe (6) links to each other, and unique difference is that output voltage is with respect to common mode voltage (V
CM) definition.Fig. 4 lower left corner is common mode voltage generative circuit 4, and its output terminal 9 is connected to the forward output circuit 1 and the reverse low-voltage input end of output circuit 2 respectively, and the common mode voltage of its input voltage and continuous variable gain amplifier identical all be V
CM, because there is electric current from this gradient voltage generator, to flow into (V
CM), so a voltage buffer is absolutely necessary.
As control voltage V
AGCWhen being added in the 4th PMOS pipe 11 (M2) grid, the negative-feedback circuit that the 3rd NMOS pipe 12 (M3) and the 4th NMOS pipe 13 (M4) constitute will guarantee that input difference is operated in the saturation region to the 3rd PMOS pipe 10 (M1) and the 4th PMOS pipe 11 (M2).This moment, the electric current of the 3rd PMOS pipe 10 (M1) and the 4th PMOS pipe 11 (M2) was constant, and the voltage that is added in first resistance 14 (R1) two ends so will be constantly equal to V
AGC-V
RefSo flow through the electric current Δ I=(V of first resistance 14 (R1)
AGC-V
Ref)/R1.Δ I flows among the 3rd NMOS pipe 12 (M3) and the 4th NMOS pipe 13 (M4), and passes through current mirror: NMOS pipe the 5 and the 2nd NMOS pipe 6 (M5﹠amp; M6) transfer on the output resistance 15 (R2).If the gain that current mirror produces is 1, the output voltage of Ramp Gen equals (V so
AGC-V
Ref) R2/R1+V
DCV
DCBe to work as V
AGCWith V
RefThe dc voltage of Ramp Gen output point when equating, V
DCBe to determine, can be written as V by bias current and output resistance 15 (R2) from Bandgap
DC=(I
Bias-N*I
b) * R2+V
CMDescribed I
BiasAnd I
bAll from Bandgap, so V
DCCan be write as k*V
Bg* R2/R
Bg+ V
CM, wherein k is a constant; V
BgBe the output voltage of Bandgap, be one not with the steady state value of technology, temperature, change in voltage; Obviously easily see V
DCOnly and R
2And R
BgAs long as resistance ratio is relevant, therefore R
2And R
BgCoupling, V
DCJust can regard a constant voltage+V as
CM
Obviously see that easily the output voltage of Ramp Gen finally can be written as:
(V
AGC-V
ref)R2/R?1+k*V
bg*R2/R
bg+V
CM
V
CMBeing the common mode voltage of VGA among Fig. 1, also is the bias voltage of adjustable resistance.So V
CMVariable-resistance influence has been offset by the output voltage of Ramp Gen.
In sum the output voltage of Ramp Gen only with the ratio and the V of resistance
AGCRelevant, it doesn't matter with technology, temperature, voltage, and can offset V
CMInfluence to the VGA adjustable resistance.This RampGen circuit application in VGA, can be made the gain characteristic curve and control voltage V of VGA
AGCRelation more accurate, technology, temperature, voltage are reduced to minimum to the VGA Effect on Performance.
Claims (1)
1. gradient voltage generator that is used for the gain amplifier of continuous variable, be provided with forward output circuit (1), reverse output circuit (2), it is characterized in that: described gradient voltage generator also is provided with a CMOS transconductance circuit (3) and a common mode voltage generative circuit (4), described CMOS transconductance circuit (3) is converted into electric current with input voltage, and the drain electrode by NMOS pipe (5), the drain electrode of NMOS pipe (6) and the drain electrode of the pipe of the PMOS in the forward output circuit (1) (7), oppositely the drain electrode of the 2nd PMOS pipe (8) in the output circuit (2) connects the current mirror that is constituted respectively, this current transfer is arrived forward output circuit (1), oppositely go in the output circuit (2), the input voltage of described common mode voltage generative circuit (4) is identical with the common mode voltage of continuous variable gain amplifier, and its output terminal (9) is connected to the low-voltage input end of forward output circuit (1) and reverse output circuit (2) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010505772.2A CN101995900B (en) | 2010-10-13 | 2010-10-13 | Gradient voltage generator used for continuous variable gain amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010505772.2A CN101995900B (en) | 2010-10-13 | 2010-10-13 | Gradient voltage generator used for continuous variable gain amplifier |
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| Publication Number | Publication Date |
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| CN101995900A true CN101995900A (en) | 2011-03-30 |
| CN101995900B CN101995900B (en) | 2014-07-02 |
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| CN201010505772.2A Active CN101995900B (en) | 2010-10-13 | 2010-10-13 | Gradient voltage generator used for continuous variable gain amplifier |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI477942B (en) * | 2012-07-10 | 2015-03-21 | Macronix Int Co Ltd | Voltage buffer apparatus |
| US9018933B2 (en) | 2012-07-19 | 2015-04-28 | Macronix International Co., Ltd. | Voltage buffer apparatus |
| CN107171650A (en) * | 2016-03-08 | 2017-09-15 | 晶豪科技股份有限公司 | Variable-gain amplification circuit |
| CN109787583A (en) * | 2018-11-27 | 2019-05-21 | 西安电子科技大学 | A kind of low frequency fully differential Gm-C filter applied to ECG signal acquisition |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101013911A (en) * | 2007-02-13 | 2007-08-08 | 鼎芯通讯（上海）有限公司 | Control circuit of radio-frequency variable gain amplifier and gain control method |
| CN101350605A (en) * | 2008-09-12 | 2009-01-21 | 东南大学 | Improved bipolar type variable gain amplifier with minimum gain control |
| US20090102559A1 (en) * | 2005-11-23 | 2009-04-23 | Nxp B.V. | Monotonic variable gain amplifier and an automatic gain control circuit |
| CN201828845U (en) * | 2010-10-13 | 2011-05-11 | 苏州科山微电子科技有限公司 | Gradient voltage generator for continuous variable gain amplifier |
-
2010
- 2010-10-13 CN CN201010505772.2A patent/CN101995900B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090102559A1 (en) * | 2005-11-23 | 2009-04-23 | Nxp B.V. | Monotonic variable gain amplifier and an automatic gain control circuit |
| CN101013911A (en) * | 2007-02-13 | 2007-08-08 | 鼎芯通讯（上海）有限公司 | Control circuit of radio-frequency variable gain amplifier and gain control method |
| CN101350605A (en) * | 2008-09-12 | 2009-01-21 | 东南大学 | Improved bipolar type variable gain amplifier with minimum gain control |
| CN201828845U (en) * | 2010-10-13 | 2011-05-11 | 苏州科山微电子科技有限公司 | Gradient voltage generator for continuous variable gain amplifier |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI477942B (en) * | 2012-07-10 | 2015-03-21 | Macronix Int Co Ltd | Voltage buffer apparatus |
| US9018933B2 (en) | 2012-07-19 | 2015-04-28 | Macronix International Co., Ltd. | Voltage buffer apparatus |
| CN107171650A (en) * | 2016-03-08 | 2017-09-15 | 晶豪科技股份有限公司 | Variable-gain amplification circuit |
| CN107171650B (en) * | 2016-03-08 | 2020-04-17 | 晶豪科技股份有限公司 | Variable gain amplifier circuit |
| CN109787583A (en) * | 2018-11-27 | 2019-05-21 | 西安电子科技大学 | A kind of low frequency fully differential Gm-C filter applied to ECG signal acquisition |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101995900B (en) | 2014-07-02 |
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Effective date of registration: 20170323 Address after: Siming District Feng Yu Road Xiamen City, Fujian province 361000 No. 57 room 402 Patentee after: Xiamen science and Technology Co., Ltd. Address before: 215021, Jiangsu, Suzhou Industrial Park, Jinji Lake Avenue, No. 1355, international science and Technology Park, phase A404, 2 Patentee before: Suzhou Cosine Microelectronics Technology Co., Ltd. |
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Effective date of registration: 20181101 Address after: 362000 3001 Luoshan three Century Avenue, Luoshan, Quanzhou, Fujian. Patentee after: Keshan core creation (Fujian) Technology Co., Ltd. Address before: 361000 room 402, 57 Feng Yu Road, Siming District, Xiamen, Fujian. Patentee before: Xiamen science and Technology Co., Ltd. |