CN103457556A - Variable gain amplifier and control method thereof - Google Patents
Variable gain amplifier and control method thereof Download PDFInfo
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- CN103457556A CN103457556A CN201210174144XA CN201210174144A CN103457556A CN 103457556 A CN103457556 A CN 103457556A CN 201210174144X A CN201210174144X A CN 201210174144XA CN 201210174144 A CN201210174144 A CN 201210174144A CN 103457556 A CN103457556 A CN 103457556A
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Abstract
The invention provides a variable gain amplifier and a control method thereof. All transistor switches of a first gain control unit and a second gain control unit take load impedance as loads, so that the problems that difference in loads connected with the transistor switches in the prior art causes difference of the load impedance from an input end of the variable gain amplifier and further causes step order drift of gain control of the variable gain amplifier are solved, and accuracy of the variable gain amplifier and the control method thereof is improved.
Description
Technical field
The present invention relates to wireless communication technology field, particularly a kind of variable gain amplifier and control method thereof.
Background technology
Along with the progress of wireless communication technology, wireless communication system is controlled power, is also that the requirement of gain control range improves day by day.For realizing gain control function, wireless communication transmitter is generally used variable gain amplifier (Variable Gain Amplifier, VGA), so that adjustable gain to be provided.
Please refer to Fig. 1, its electrical block diagram that is existing variable gain amplifier.As shown in Figure 1, described variable gain amplifier comprises: the first gain control unit 10, and described the first gain control unit 10 is connected in the first input end of difference channel structure; The second gain control unit 11, described the second gain control unit 11 is connected in the second input of difference channel structure; Wherein, the first gain control unit 10 and the second gain control unit 11 include a plurality of transistor switches, a part of transistor switch in the first gain control unit 10 is connected with load impedance, another part transistor switch is connected with power supply Vdda, a part of transistor switch in the second gain control unit 11 is connected with load impedance, another part transistor switch is connected with power supply Vdda, by the connecting and disconnecting realization gain of a plurality of transistor switches in the first gain control unit 10 and the second gain control unit 11, controls.
Concrete, the first gain control unit 10 comprises transistor switch M0a, M1a, M2a, M3a, M1c, M2c and M3c, and wherein, M0a, M1a, M2a and M3a are connected with load impedance, and M1c, M2c and M3c are connected with power supply Vdda.M0a is normal on-state, and M1a, M2a and M3a carry out break-make control by control signal A1, A2 and A3 respectively, and M1c, M2c and M3c pass through respectively control signal
and
carry out break-make control, wherein, A1, A2, A3 and
complementary.The second gain control unit 11 comprises transistor switch M0b, M1b, M2b, M3b, M1d, M2d and M3d, and wherein, M0b, M1b, M2b and M3b are connected with load impedance, and M1d, M2d and M3d are connected with power supply Vdda.Same, M0b is normal on-state, and M1d, M2d and M3d carry out break-make control by control signal A1, A2 and A3 respectively, and M1d, M2d and M3d pass through respectively control signal
and
carry out break-make control.
While controlling by the connecting and disconnecting realization gain of above-mentioned transistor switch, concrete example is as input control signal A1A2A3=100, now, transistor switch M1a, M1b, M2c, M3c, M2d and M3d connect (certainly, M0a and M0b are also in on-state), transistor switch M2a, M3a, M1c, M2b, M3b and M1d disconnect, the first input end input current Idc+Iac of difference channel structure flows to respectively load impedance and power supply Vdda by transistor switch M0a, M1a, M2c and M3c, thereby realizes shunting; Same, the second input input current Idc+Iac of difference channel structure (wherein, the interchange input current Iac of described the second input has different polarity from the interchange input current Iac of first input end, arrow by two different directions in Fig. 1 means) flow to respectively load impedance and power supply Vdda by transistor switch M0b, M1b, M2d and M3d, thus realize shunting.
When input control signal changes, for example, input control signal A1A2A3=101, corresponding, the electric current that flows to load impedance and power supply Vdda is just different, and the change of the electric current by flowing into load impedance, realized the control of different gains.
But, because the transistor switch in this existing variable gain amplifier connects different loads, the connection load impedance had, some connection power supply Vdda, resistance difference and PVT impact (the external condition impacts such as voltage, temperature) due to these two devices (load impedance and power supply Vdda) itself, will cause the impedance of seeing into from the VGA input that the difference can not be ignored is arranged.
And thisly from input, see into, each resistance difference of controlling branch road (being comprised of a transistor switch and connected load) will cause the first gain control unit 10 and the second gain control unit 11 for the inaccuracy of current distributing, just cause thus the step that gain is controlled to drift about.In addition, the transistor switch that existing variable gain amplifier needs is much larger than controlling figure place, at this, control figure place for 3 and need 14 transistor switches, increase if control figure place, will cause transistor switch further to increase, will cause thus the increase of device cost; And also will cause the variable gain amplifier device area to increase, be unfavorable for trend toward miniaturization; Moreover the increase of transistor switch, must cause connecting the increase of contact, will cause thus the increase of parasitic capacitance, affects device performance.
Summary of the invention
The object of the present invention is to provide a kind of variable gain amplifier and control method thereof, to solve the resistance difference of the load that transistor switch was connect in prior art, the problem that the step that causes the variable gain amplifier gain to be controlled drifts about.
For solving the problems of the technologies described above, the invention provides a kind of variable gain amplifier, comprising:
The first gain control unit, in order to realize gain, control, described the first gain control unit is connected in the first input end of difference channel structure, and described the first gain control unit comprises a plurality of transistor switches, and each transistor switch is all usingd identical load impedance as load;
The second gain control unit, in order to realize gain, control, described the second gain control unit is connected in the second input of difference channel structure, and described the second gain control unit comprises a plurality of transistor switches, and each transistor switch is all usingd identical load impedance as load.
Optionally, in described variable gain amplifier, a plurality of transistor switches in described the first gain control unit comprise: often connect transistor switch and signal controlling transistor switch.
Optionally, in described variable gain amplifier, the output of described normal connection transistor switch is connected in the first output of difference channel structure; Described signal controlling transistor switch is connected in the second output of difference channel structure.
Optionally, in described variable gain amplifier, the quantity of described normal connection transistor switch is one.
Optionally, in described variable gain amplifier, the quantity of described signal controlling transistor switch is identical with the control figure place.
Optionally, in described variable gain amplifier, a plurality of transistor switches in described the second gain control unit comprise: often connect transistor switch and signal controlling transistor switch.
Optionally, in described variable gain amplifier, the output of described normal connection transistor switch is connected in the second output of difference channel structure; Described signal controlling transistor switch is connected in the first output of difference channel structure.
Optionally, in described variable gain amplifier, the quantity of described normal connection transistor switch is one.
Optionally, in described variable gain amplifier, the quantity of described signal controlling transistor switch is identical with the control figure place.
Optionally, in described variable gain amplifier, the alternating current of described first input end input is different from the alternating current polarity of the second input input.
Accordingly, the present invention also provides a kind of control method of above-mentioned variable gain amplifier, comprising:
To first input end and the second input input current signal;
The current signal of described first input end and the input of the second input inputs to load impedance after described the first gain control unit and the second gain control unit effect.
Optionally, in the control method of described variable gain amplifier, the current signal of described first input end input transfers to the first output after the first gain control unit effect; Perhaps the first output and the second output.
Optionally, in the control method of described variable gain amplifier, the current signal of described first input end input transfers to the first output after the normal connection transistor switch in the first gain control unit.
Optionally, in the control method of described variable gain amplifier, the current signal of described first input end input transfers to the second output after the signal controlling transistor switch in the first gain control unit.
Optionally, in the control method of described variable gain amplifier, the current signal of described the second input input transfers to the second output after the second gain control unit effect; Perhaps the second output and the first output.
Optionally, in the control method of described variable gain amplifier, the current signal of described the second input input transfers to the second output after the normal connection transistor switch in the second gain control unit.
Optionally, in the control method of described variable gain amplifier, the current signal of described the second input input transfers to the first output after the signal controlling transistor switch in the second gain control unit.
Optionally, in the control method of described variable gain amplifier, the alternating current of first input end input is different from the alternating current polarity of the second input input.
In variable gain amplifier provided by the present invention and control method thereof, by by each transistor switch, the all crystals pipe switch in the first gain control unit and the second gain control unit is all using load impedance as load, thereby avoided the load difference connect due to transistor switch in the prior art, the difference that causes the load impedance that variable gain amplifier sees into from input, and then cause the problem of the step drift that variable gain amplifier gain controls, improved the accuracy of variable gain amplifier and control method thereof.
The accompanying drawing explanation
Fig. 1 is the electrical block diagram of existing variable gain amplifier;
Fig. 2 is the electrical block diagram of the variable gain amplifier of the embodiment of the present invention;
Fig. 3 is the electrical block diagram of the variable gain amplifier of the embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, variable gain amplifier provided by the invention and control method thereof are described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts very the form of simplifying, only in order to convenient, the purpose of the aid illustration embodiment of the present invention lucidly.
Please refer to Fig. 2, the electrical block diagram of its variable gain amplifier that is the embodiment of the present invention.As shown in Figure 2, described variable gain amplifier comprises:
The first gain control unit 20, in order to realize gain, control, described the first gain control unit 20 is connected in the first input end 22 of difference channel structure, and described the first gain control unit 20 comprises a plurality of transistor switches, and each transistor switch is all usingd identical load impedance 26 as load;
The second gain control unit 21, in order to realize gain, control, described the second gain control unit 21 is connected in the second input 23 of difference channel structure, and described the second gain control unit 21 comprises a plurality of transistor switches, and each transistor switch is all usingd identical load impedance 26 as load.
Wherein, described first input end 22 and the second input 23 are referred to as input, or the input of difference channel, or the input of VGA etc.
Concrete, a plurality of transistor switches in described the first gain control unit 20 comprise: often connect transistor switch and signal controlling transistor switch.The output of described normal connection transistor switch is connected in the first output 24 of difference channel structure; Described signal controlling transistor switch is connected in the second output 25 of difference channel structure.
A plurality of transistor switches in described the second gain control unit 21 comprise: often connect transistor switch and signal controlling transistor switch.The output of described normal connection transistor switch is connected in the second output 25 of difference channel structure; Described signal controlling transistor switch is connected in the first output 24 of difference channel structure.
Wherein, described normal connection transistor switch refers to that this transistor switch is always in on-state, described signal controlling transistor switch refers to that the connecting and disconnecting of this transistor switch are controlled by external signal, the digital signal that common described external signal is " 0 ", " 1 ".
At this, described the first gain control unit 20 comprises a normal transistor switch M0a of connection and four signal controlling transistor switch M1a, M2a, M3a, M4a.Concrete, described transistor switch M0a, M1a, M2a, M3a, M4a are for being total to the grid switch, and source/drain terminal of M0a is connected with first input end 22, and leakage/source of M0a is connected with the first output 24; Source/drain terminal of M1a, M2a, M3a, M4a all is connected with first input end 22, and leakage/source of M1a, M2a, M3a, M4a all is connected with the second output 25.
Same, the second gain control unit 21 comprises a normal transistor switch M0b of connection and four signal controlling transistor switch M1b, M2b, M3b, M4b.Concrete, described transistor switch M0b, M1b, M2b, M3b, M4b are for being total to the grid switch, and source/drain terminal of M0b is connected with the second input 23, and leakage/source of M0b is connected with the second output 25; Source/drain terminal of M1b, M2b, M3b, M4b all is connected with the second input 23, and leakage/source of M1b, M2b, M3b, M4b all is connected with the first output 24.
In the variable gain amplifier provided at the present embodiment, the quantity of the signal controlling transistor switch in the first gain control unit 20 and the second gain control unit 21 is all identical with control signal (at this, control signal is 4 to be: A1, A2, A3, A4), whole variable gain amplifier utilizes 10 transistor switches to realize the control of 4 control signals.With the variable gain amplifier of mentioning in background technology, need 14 transistor switches could realize the control of 3 control signals, visible, the variable gain amplifier that the present embodiment provides is for the huge contribution of the aspects such as increase of the reducing of the reduction of device cost, device area, device performance.
Certainly, in other embodiments of the invention, the quantity of described normal connection transistor switch and signal controlling transistor switch is not limited to above-mentioned number, all can be more, and certainly, the quantity of signal controlling transistor switch can also be still less individual.
When utilizing above-mentioned variable gain amplifier to gain control, specifically comprise following process:
To first input end 22 input current signal Idc+Iac (being direct current Idc and alternating current Iac), wherein to the second input 23 input current signal Idc+Iac (simultaneously, the interchange input current Iac of described the second input 23 has different polarity from the interchange input current Iac of first input end 22, and the arrow by two different directions in Fig. 2 means);
The current signal of described first input end 22 and the second input 23 inputs inputs to load impedance 26 after described the first gain control unit 20 and the second gain control unit 21 effects.
Concrete, the current signal Idc+Iac of described first input end 22 inputs transfers to the first output 24 after the normal connection transistor switch M0a in the first gain control unit 20; When the control signal opening signal is controlled transistor switch, the current signal Idc+Iac of described first input end 22 inputs also transfers to the second output 25 after the signal controlling transistor switch in the first gain control unit 20.
The current signal Idc+Iac of described the second input 23 inputs transfers to the second output 25 after the normal connection transistor switch M0b in the second gain control unit 21; When the control signal opening signal is controlled transistor switch, the current signal Idc+Iac of described the second input 23 inputs also transfers to the first output 24 after the signal controlling transistor switch in the second gain control unit 21.
Suppose that control signal is A1A2A3A4=1000,
In the first gain control unit 20, transistor switch M1a connects (certainly, transistor switch M0a is also open-minded), the current signal Idc+Iac of first input end 22 inputs is shunted by transistor switch M0a and M1a, then, transfer to the first output 24 through the electric current of transistor switch M0a (electric current after shunting is less than the current signal Idc+Iac of original input); Current delivery to the second output 25 through transistor switch M1a;
In the second gain control unit 21, transistor switch M1b connects (certainly, transistor switch M0b is also open-minded), the current signal Idc+Iac of the second input 23 inputs is shunted by transistor switch M0b and M1b, then, transfer to the second output 25 through the electric current of transistor switch M0b (electric current after shunting is less than the current signal Idc+Iac of original input); Current delivery to the first output 24 through transistor switch M1b.
By the shunting of transistor switch (to electric current), just can realize gain control, specifically show below:
Suppose, the monolateral size of current that the circuit prime flows into variable gain amplifier is I
total, each MOS switch (transistor switch) pipe channel length is unanimously L, MOS switch M0a-M4a channel width is: W
0, X
1* W
0, X
2* W
0, X
3* W
0, X
4* W
0, same, MOS switch M0b-M4b channel width is: W
0, X
1* W
0, X
2* W
0, X
3* W
0, X
4* W
0.
As digital control position A1A2A3A4=0000, MOS switch M1a-M4a and M1b-M4b all close, all by gate device switch (MOS switch) M0a-M0b altogether, now flow to the ac current signal maximum of load impedance 26 (i.e. the first output 24 and the second output 25): I from the ac current signal of prime
out=I
total, concerning variable gain amplifier, gain is GAIN to the maximum
0;
When digital control position A1 is high level, A2-A4 is that low level (is A1=1, A2A3A4=000) time, MOS switch M1a-M1b conducting, after the M1a-M1b cross cancellation, (this difference of polarity due to alternating current, flow into the current summation of same output, be cross cancellation), cause the electric current that flows to load to reduce, now
now gain is reduced to GAIN
1;
In like manner,
Work as A1A2=1, during A3A4=0,
Gain is GAIN
2
Work as A1A2A3=1, during A4=0,
Gain is GAIN
3
When A1A2A3A4=1,
Gain is GAIN
4
Therefore,
(formula 1)
Like this, the size of low and high level and transistor switch by the transistor switch control signal, just can realize that proportional gain controls.Preferably, when transistor switch, in opening when (or being called conducting state, operating state), it works in (altogether gate transistor) saturation region, has avoided thus the infringement to the transistor switch linearity.On the disclosed basis of the application, the gain ratio that concrete size can design is as required derived.
In order to further illustrate on the disclosed basic mountain of the application, can realize the different variable gain amplifiers that require, the following example of special tool (please refer to Fig. 3):
A radio frequency driver amplifier circuit of controlling function with variable gain in the TD-SCDMA transmitter, the radio-frequency voltage signal is after coupling capacitance, enter common source and common grid amplifier M1-M4, change current signal into, then the variable gain amplifier proposed through the application, enter the laod network of passive transducer structure, convert the power signal driver output to ohm load.The gain step of supposing VGA is 9.5dB, and total gain control range is 38dB.That is:
Therefore, according to formula (1), the ratio that just can release the design size of MOS switch M4a-M0a and M4b-M0b is:
That is, when the transistor switch in described variable gain amplifier is of a size of aforementioned proportion, just can realize that gain step is 9.5dB, total gain control range is 38dB.
Foregoing description is only the description to preferred embodiment of the present invention, and not to any restriction of the scope of the invention, any change, modification that the those of ordinary skill in field of the present invention is done according to above-mentioned disclosure, all belong to the protection range of claims.
Claims (18)
1. a variable gain amplifier, is characterized in that, comprising:
The first gain control unit, in order to realize gain, control, described the first gain control unit is connected in the first input end of difference channel structure, and described the first gain control unit comprises a plurality of transistor switches, and each transistor switch is all usingd identical load impedance as load;
The second gain control unit, in order to realize gain, control, described the second gain control unit is connected in the second input of difference channel structure, and described the second gain control unit comprises a plurality of transistor switches, and each transistor switch is all usingd identical load impedance as load.
2. variable gain amplifier as claimed in claim 1, is characterized in that, a plurality of transistor switches in described the first gain control unit comprise: often connect transistor switch and signal controlling transistor switch.
3. variable gain amplifier as claimed in claim 2, is characterized in that, the output of described normal connection transistor switch is connected in the first output of difference channel structure; Described signal controlling transistor switch is connected in the second output of difference channel structure.
4. variable gain amplifier as claimed in claim 2, is characterized in that, the quantity of described normal connection transistor switch is one.
5. variable gain amplifier as claimed in claim 2, is characterized in that, the quantity of described signal controlling transistor switch is identical with the control figure place.
6. variable gain amplifier as claimed in claim 1, is characterized in that, a plurality of transistor switches in described the second gain control unit comprise: often connect transistor switch and signal controlling transistor switch.
7. variable gain amplifier as claimed in claim 6, is characterized in that, the output of described normal connection transistor switch is connected in the second output of difference channel structure; Described signal controlling transistor switch is connected in the first output of difference channel structure.
8. variable gain amplifier as claimed in claim 6, is characterized in that, the quantity of described normal connection transistor switch is one.
9. variable gain amplifier as claimed in claim 6, is characterized in that, the quantity of described signal controlling transistor switch is identical with the control figure place.
10. variable gain amplifier as described as any one in claim 1 to 9, is characterized in that, the alternating current of described first input end input is different from the alternating current polarity of the second input input.
11. the control method as the described variable gain amplifier of any one in claim 1 to 10, is characterized in that, comprising:
To first input end and the second input input current signal;
The current signal of described first input end and the input of the second input inputs to load impedance after described the first gain control unit and the second gain control unit effect.
12. the control method of variable gain amplifier as claimed in claim 11, is characterized in that, the current signal of described first input end input transfers to the first output after the first gain control unit effect; Perhaps the first output and the second output.
13. the control method of variable gain amplifier as claimed in claim 12, is characterized in that, the current signal of described first input end input transfers to the first output after the normal connection transistor switch in the first gain control unit.
14. the control method of variable gain amplifier as claimed in claim 12, is characterized in that, the current signal of described first input end input transfers to the second output after the signal controlling transistor switch in the first gain control unit.
15. the control method of variable gain amplifier as claimed in claim 11, is characterized in that, the current signal of described the second input input transfers to the second output after the second gain control unit effect; Perhaps the second output and the first output.
16. the control method of variable gain amplifier as claimed in claim 15, is characterized in that, the current signal of described the second input input transfers to the second output after the normal connection transistor switch in the second gain control unit.
17. the control method of variable gain amplifier as claimed in claim 15, is characterized in that, the current signal of described the second input input transfers to the first output after the signal controlling transistor switch in the second gain control unit.
18. the control method as the described variable gain amplifier of any one in claim 11 to 17, is characterized in that, the alternating current of first input end input is different from the alternating current polarity of the second input input.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105720974A (en) * | 2016-01-20 | 2016-06-29 | 深圳市同创国芯电子有限公司 | Oscillator circuit, phase-locked loop circuit, and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090072908A1 (en) * | 2007-09-14 | 2009-03-19 | Sony Corporation | Gain control circuit and optical recording and reproducing device using thereof |
| US20110115507A1 (en) * | 2007-11-20 | 2011-05-19 | Eugene Heaney | Power delivery circuit monitoring |
| CN201846315U (en) * | 2010-09-20 | 2011-05-25 | 东南大学 | Digital variable gain amplifier |
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2012
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090072908A1 (en) * | 2007-09-14 | 2009-03-19 | Sony Corporation | Gain control circuit and optical recording and reproducing device using thereof |
| US20110115507A1 (en) * | 2007-11-20 | 2011-05-19 | Eugene Heaney | Power delivery circuit monitoring |
| CN201846315U (en) * | 2010-09-20 | 2011-05-25 | 东南大学 | Digital variable gain amplifier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105720974A (en) * | 2016-01-20 | 2016-06-29 | 深圳市同创国芯电子有限公司 | Oscillator circuit, phase-locked loop circuit, and device |
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