CN102195580B - PGA (programmable gain amplifier) circuit and implementation method thereof - Google Patents
PGA (programmable gain amplifier) circuit and implementation method thereof Download PDFInfo
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- CN102195580B CN102195580B CN201010128047.8A CN201010128047A CN102195580B CN 102195580 B CN102195580 B CN 102195580B CN 201010128047 A CN201010128047 A CN 201010128047A CN 102195580 B CN102195580 B CN 102195580B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000010586 diagram Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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Abstract
The invention provides a PGA (programmable gain amplifier) circuit and an implementation method thereof. The circuit comprises a PGA, wherein a signal input channel of the PGA is provided with a multi-path switch; and a distortion offset unit is arranged between the multi-path switch and the PGA and used for offsetting influences of the switch resistance R' of the multi-path switch on input signals Vin of the PGA. According to the invention, the distortion generated by an MUX (multiplexer) in the PGA circuit can be compensated.
Description
Technical field
The present invention relates to circuit field, particularly relate to a kind of programmable gain amplifier circuit and implementation method.
Background technology
PGA (programmable gain amplifier, programmable gain amplifier) is a kind of amplifier that can be realized adjustable gain joint by programming.At present in CMOS (complementary metal oxide semiconductors (CMOS)) technique adopting PGA, be usually provided with MUX (Multiplexer, variable connector).Fig. 1 is the structure chart of variable connector, as shown in Figure 1, it is made up of PMOS (P-channel metal-oxide-semiconductor) switch 101 and NMOS (N NMOS N-channel MOS N) switch 102, and variable connector itself has resistance.
Fig. 2 is the circuit diagram that variable connector is applied in PGA circuit, as shown in Figure 2, cmos signal path is provided with variable connector 201 and programmable gain amplifier 202, the conducting resistance R ' of variable connector 201 on signal path changes with input signal Vin, Vout/Vin=-R2/ (R1+R '), therefore, due to the impact of variable connector 201, cause output signal Vout distortion.Although conducting resistance R ' can be reduced by the area increasing variable connector 201 in CMOS chip, still can not eliminate the impact brought thus completely, but also chip area can be made to increase, cost increase.
Summary of the invention
The object of this invention is to provide a kind of programmable gain amplifier circuit and implementation method, the distortion that MUX produces in PGA circuit can be compensated.
To achieve these goals, on the one hand, provide a kind of programmable gain amplifier circuit, comprising: programmable gain amplifier, it is characterized in that,
The signal input channel of described programmable gain amplifier is provided with variable connector, between described variable connector and described programmable gain amplifier, is also provided with distortion cancellation unit;
Described distortion cancellation unit is for offsetting the switch resistance R ' of described variable connector to the impact of the input signal Vin of described programmable gain amplifier.
Preferably, in above-mentioned circuit, described distortion cancellation unit comprises the first amplifier and the second amplifier;
The forward end ground connection of described first amplifier, the negative end of described first amplifier connects described variable connector by the first resistance R1, is connected with the second resistance R2 between the negative end of described first amplifier and the output of described first amplifier;
The forward end ground connection of described second amplifier, the negative end of described second amplifier connects the output of described first amplifier by the 3rd resistance R3, be connected with the 4th resistance R4 between the negative end of described second amplifier and the output of described second amplifier, between described 4th resistance R4 and the output of described second amplifier, be provided with second switch;
Wherein, R1=R2=R3=R4, the output of described second amplifier connects described programmable gain amplifier.
Preferably, in above-mentioned circuit, described programmable gain amplifier comprises the 3rd amplifier;
The forward end ground connection of described 3rd amplifier, the negative end of described 3rd amplifier, by the output of described second amplifier of the 5th variable resistor R5 connection, is connected with the 6th variable resistor R6 between the negative end of described 3rd amplifier and the output of described 3rd amplifier.
Preferably, in above-mentioned circuit, described variable connector is made up of PMOS switch and nmos switch.
Preferably, in above-mentioned circuit, described first amplifier, described second amplifier and described 3rd amplifier have identical circuit structure.
Preferably, in above-mentioned circuit, described programmable gain amplifier circuit is cmos circuit.
To achieve these goals, the present invention also provides a kind of implementation method of programmable gain amplifier circuit, and described circuit comprises programmable gain amplifier, and described method comprises:
The signal input channel of described programmable gain amplifier arranges variable connector, distortion cancellation unit is also set between described variable connector and described programmable gain amplifier;
The switch resistance R ' of described variable connector is offset on the impact of the input signal Vin of described programmable gain amplifier by described distortion cancellation unit.
Preferably, in above-mentioned implementation method, realize described distortion cancellation unit in the following way:
Described distortion cancellation unit comprises the first amplifier and the second amplifier;
The forward end ground connection of described first amplifier, the negative end of described first amplifier connects described variable connector by the first resistance R1, is connected with the second resistance R2 between the negative end of described first amplifier and the output of described first amplifier;
The forward end ground connection of described second amplifier, the negative end of described second amplifier connects the output of described first amplifier by the 3rd resistance R3, be connected with the 4th resistance R4 between the negative end of described second amplifier and the output of described second amplifier, between described 4th resistance R4 and the output of described second amplifier, be provided with second switch;
Wherein, R1=R2=R3=R4, the output of described second amplifier connects described programmable gain amplifier.
Preferably, in above-mentioned implementation method, realize described programmable gain amplifier in the following way:
Described programmable gain amplifier comprises the 3rd amplifier;
The forward end ground connection of described 3rd amplifier, the negative end of described 3rd amplifier, by the output of described second amplifier of the 5th variable resistor R5 connection, is connected with the 6th variable resistor R6 between the negative end of described 3rd amplifier and the output of described 3rd amplifier.
Preferably, in above-mentioned implementation method, described first amplifier, described second amplifier and described 3rd amplifier adopt identical circuit structure.
At least there is following technique effect in the present invention:
1) produce a new distortion by distortion cancellation unit, compensate the distortion that MUX produces, thus offset the impact of MUX, new distortion is identical with the distortion of MUX, and therefore the present invention more effectively, more thoroughly can reduce distortion than conventional method.
2) circuit of the programmable gain amplifier of the embodiment of the present invention realizes in cmos circuitry, and by making amplifier A1, A2, A3 adopt identical circuit structure, is easy to realize in standard CMOS circuitry.
Accompanying drawing explanation
Fig. 1 is the structure chart of variable connector;
Fig. 2 is the circuit diagram that variable connector is applied in PGA circuit;
The circuit diagram of the programmable gain amplifier circuit that Fig. 3 provides for the embodiment of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with accompanying drawing, specific embodiment is described in detail.
In order to eliminate the distorted signals that variable connector causes in PGA circuit, the embodiment of the present invention provides a kind of circuit of programmable gain amplifier, Fig. 3 is its circuit diagram, as shown in the figure, it comprises: programmable gain amplifier 302, the signal input channel of described programmable gain amplifier 302 is provided with variable connector 301, between described variable connector 301 and described programmable gain amplifier 302, is also provided with distortion cancellation unit 303;
Described distortion cancellation unit 303 is for offsetting the switch resistance R ' of described variable connector to the impact of the input signal Vin of described programmable gain amplifier.
Visible, the present invention newly increases a distortion cancellation unit, produces the distortion identical with variable connector, and compensates the distortion of variable connector with it, thus the impact that elimination variable connector produces.
In another embodiment of the present invention, described distortion cancellation unit comprises the first amplifier A1 and the second amplifier A2;
The forward end ground connection of described first amplifier A1, the negative end of described first amplifier A1 connects described variable connector by the first resistance R1, is connected with the second resistance R2 between the negative end of described first amplifier A1 and the output of described first amplifier A1;
The forward end ground connection of described second amplifier A2, the negative end of described second amplifier A2 connects the output of described first amplifier A1 by the 3rd resistance R3, be connected with the 4th resistance R4 between the negative end of described second amplifier A3 and the output of described second amplifier A2, between described 4th resistance R4 and the output of described second amplifier, be provided with second switch Km; The output of described second amplifier connects described programmable gain amplifier 302.Setting R1=R2=R3=R4=R.
Therefore, output Vout1=-R/ (R+R ') Vin of the first amplifier A1; Output Vout2=-(R+R ")/R*Vout1 of the second amplifier A2; Wherein R " being the resistance of Km, because R ' and R " is very little relative to R, so K switch 1 is equal with the Vgs of the metal-oxide-semiconductor in Km, and R ' and R " equal, that is: Vout2=Vin.Vout2 is the signal not having distortion, thus input programmable gain amplifier 302 is the signal not having distortion, and the impact of variable connector 301 has been cancelled.
Described programmable gain amplifier 302 comprises the 3rd amplifier A3;
The forward end ground connection of described 3rd amplifier A3, the negative end of described 3rd amplifier A3, by the output of the described second amplifier A2 of the 5th variable resistor R5 connection, is connected with the 6th variable resistor R6 between the negative end of described 3rd amplifier A3 and the output of described 3rd amplifier A3.Thus the function of programmable gain amplifier 302 is realized by the 3rd amplifier A3.
Described variable connector can be made up of PMOS switch and nmos switch.Described programmable gain amplifier circuit is cmos circuit.
Described first amplifier A1, described second amplifier A2 and described 3rd amplifier A3 have identical circuit structure, are easy to realize in standard CMOS circuitry.
The embodiment of the present invention also provides a kind of implementation method of programmable gain amplifier circuit, and described circuit comprises programmable gain amplifier, and described method comprises:
Step one, the signal input channel of described programmable gain amplifier arranges variable connector, between described variable connector and described programmable gain amplifier, also arranges distortion cancellation unit;
Step 2, offsets the switch resistance R ' of described variable connector to the impact of the input signal Vin of described programmable gain amplifier by described distortion cancellation unit.
Visible, in the inventive method embodiment, by producing a new distortion, compensate the distortion that MUX produces, thus offset the impact of MUX, new distortion is identical with the distortion of MUX, and therefore the present invention more effectively, more thoroughly can reduce distortion than conventional method.
Wherein, described distortion cancellation unit is realized in the following way: described distortion cancellation unit comprises the first amplifier and the second amplifier; The forward end ground connection of described first amplifier, the negative end of described first amplifier connects described variable connector by the first resistance R1, is connected with the second resistance R2 between the negative end of described first amplifier and the output of described first amplifier; The forward end ground connection of described second amplifier, the negative end of described second amplifier connects the output of described first amplifier by the 3rd resistance R3, be connected with the 4th resistance R4 between the negative end of described second amplifier and the output of described second amplifier, between described 4th resistance R4 and the output of described second amplifier, be provided with second switch; Wherein, R1=R2=R3=R4, the output of described second amplifier connects described programmable gain amplifier.
Wherein, described programmable gain amplifier is realized in the following way: described programmable gain amplifier comprises the 3rd amplifier; The forward end ground connection of described 3rd amplifier, the negative end of described 3rd amplifier, by the output of described second amplifier of the 5th variable resistor R5 connection, is connected with the 6th variable resistor R6 between the negative end of described 3rd amplifier and the output of described 3rd amplifier.
Wherein, described first amplifier A1, described second amplifier A2 and described 3rd amplifier A3 adopt identical circuit structure, are easy to realize in standard CMOS circuitry.
As from the foregoing, the embodiment of the present invention has following advantage:
1) produce a new distortion by distortion cancellation unit, compensate the distortion that MUX produces, thus offset the impact of MUX, new distortion is identical with the distortion of MUX, and therefore the present invention more effectively, more thoroughly can reduce distortion than conventional method.
2) circuit of the programmable gain amplifier of the embodiment of the present invention realizes in cmos circuitry, and by making amplifier A1, A2, A3 adopt identical circuit structure, is easy to realize in standard CMOS circuitry.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. a programmable gain amplifier circuit, comprising: programmable gain amplifier, it is characterized in that,
The signal input channel of described programmable gain amplifier is provided with variable connector, between described variable connector and described programmable gain amplifier, is also provided with distortion cancellation unit;
Described distortion cancellation unit is for offsetting the switch resistance R' of described variable connector to the impact of the input signal Vin of described programmable gain amplifier;
Described distortion cancellation unit comprises the first amplifier and the second amplifier;
The forward end ground connection of described first amplifier, the negative end of described first amplifier connects described variable connector by the first resistance R1, is connected with the second resistance R2 between the negative end of described first amplifier and the output of described first amplifier;
The forward end ground connection of described second amplifier, the negative end of described second amplifier connects the output of described first amplifier by the 3rd resistance R3, be connected with the 4th resistance R4 between the negative end of described second amplifier and the output of described second amplifier, between described 4th resistance R4 and the output of described second amplifier, be provided with second switch;
Wherein, R1=R2=R3=R4, the output of described second amplifier connects described programmable gain amplifier.
2. programmable gain amplifier circuit according to claim 1, is characterized in that, described programmable gain amplifier comprises the 3rd amplifier;
The forward end ground connection of described 3rd amplifier, the negative end of described 3rd amplifier, by the output of described second amplifier of the 5th variable resistor R5 connection, is connected with the 6th variable resistor R6 between the negative end of described 3rd amplifier and the output of described 3rd amplifier.
3. programmable gain amplifier circuit according to claim 1, is characterized in that, described variable connector is made up of PMOS switch and nmos switch.
4. programmable gain amplifier circuit according to claim 2, is characterized in that, described first amplifier, described second amplifier and described 3rd amplifier have identical circuit structure.
5. the programmable gain amplifier circuit according to any one of claim 1-4, described programmable gain amplifier circuit is cmos circuit.
6. an implementation method for programmable gain amplifier circuit, described circuit comprises programmable gain amplifier, it is characterized in that, described method comprises:
The signal input channel of described programmable gain amplifier arranges variable connector, distortion cancellation unit is also set between described variable connector and described programmable gain amplifier;
The switch resistance R' of described variable connector is offset on the impact of the input signal Vin of described programmable gain amplifier by described distortion cancellation unit;
Wherein, described distortion cancellation unit is realized in the following way:
Described distortion cancellation unit comprises the first amplifier and the second amplifier;
The forward end ground connection of described first amplifier, the negative end of described first amplifier connects described variable connector by the first resistance R1, is connected with the second resistance R2 between the negative end of described first amplifier and the output of described first amplifier;
The forward end ground connection of described second amplifier, the negative end of described second amplifier connects the output of described first amplifier by the 3rd resistance R3, be connected with the 4th resistance R4 between the negative end of described second amplifier and the output of described second amplifier, between described 4th resistance R4 and the output of described second amplifier, be provided with second switch;
Wherein, R1=R2=R3=R4, the output of described second amplifier connects described programmable gain amplifier.
7. implementation method according to claim 6, is characterized in that, realizes described programmable gain amplifier in the following way:
Described programmable gain amplifier comprises the 3rd amplifier;
The forward end ground connection of described 3rd amplifier, the negative end of described 3rd amplifier, by the output of described second amplifier of the 5th variable resistor R5 connection, is connected with the 6th variable resistor R6 between the negative end of described 3rd amplifier and the output of described 3rd amplifier.
8. implementation method according to claim 7, is characterized in that, described first amplifier, described second amplifier and described 3rd amplifier adopt identical circuit structure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010128047.8A CN102195580B (en) | 2010-03-16 | 2010-03-16 | PGA (programmable gain amplifier) circuit and implementation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010128047.8A CN102195580B (en) | 2010-03-16 | 2010-03-16 | PGA (programmable gain amplifier) circuit and implementation method thereof |
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| CN102195580A CN102195580A (en) | 2011-09-21 |
| CN102195580B true CN102195580B (en) | 2015-05-06 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2466301A (en) * | 2008-12-19 | 2010-06-23 | Cambridge Silicon Radio Ltd | Low distortion switched gain amplifier with compensation for switch non-linearity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3060496B2 (en) * | 1990-07-31 | 2000-07-10 | ソニー株式会社 | Switch circuit |
| JP2000341061A (en) * | 1999-05-26 | 2000-12-08 | Mitsubishi Electric Corp | Switching noise reduction circuit |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2466301A (en) * | 2008-12-19 | 2010-06-23 | Cambridge Silicon Radio Ltd | Low distortion switched gain amplifier with compensation for switch non-linearity |
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| Title |
|---|
| 全差分可调频率四阶Chebyshev滤波器的实现;江金光等;《电子与信息学报》;20040520;第26卷(第5期);第800-806页 * |
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Effective date of registration: 20210120 Address after: 401120 no.117-338, Yunhan Avenue, Beibei District, Chongqing Patentee after: Chongqing Zhongxing micro artificial intelligence chip technology Co.,Ltd. Address before: 100083, Haidian District, Xueyuan Road, Beijing No. 35, Nanjing Ning building, 15 Floor Patentee before: Vimicro Corp. |