CN103187940A - Programmable amplifier and receiver - Google Patents
Programmable amplifier and receiver Download PDFInfo
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- CN103187940A CN103187940A CN2011104483286A CN201110448328A CN103187940A CN 103187940 A CN103187940 A CN 103187940A CN 2011104483286 A CN2011104483286 A CN 2011104483286A CN 201110448328 A CN201110448328 A CN 201110448328A CN 103187940 A CN103187940 A CN 103187940A
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Abstract
The invention discloses a programmable amplifier and a receiver. A gain control unit controls on and off of transconductance branches of a transconductance circuit to control the number of the transconductance branches in working states, so as to adjust a relationship among a gain, a noise factor and linearity. When the gain of the amplifier is required to be reduced, the gain control unit transmits a switch control signal to open one or more transconductance branches of the transconductance circuit; after the number of the transconductance branches in the working states is reduced, the gain of the amplifier is reduced, the current density of the transconductance branches in the working states is increased, and the linearity of the amplifier is improved; on the contrary, the number of the transconductance branches in the working states in the transconductance circuit is increased, the gain of the amplifier is increased, and the noise performance of the amplifier is better. Therefore, the linearity and noise performance of the amplifier can be adjusted according to the change situation of the gain, the amplifier can be in the optimal working state in different communication environments, and the use cost is lowered.
Description
Technical field
The present invention relates to the amplifying circuit technical field, concrete a kind of programmable amplifier and a kind of receiver.
Background technology
In communication system, receiver need be handled multiple different communication environment, for example when the useful signal amplitude that receives is very little, needs the sensitivity of receiver best, needs the gain maximum of receiver, noise factor minimum this moment; Amplitude at the received useful signal of receiver is not very little, and specific sensitivity is big, but has this moment other interference to exist, and need consider the linearity of receiver this time.Therefore receiver generally all includes a programmable amplifier (PGA), to go to adjust dynamically the gain of PGA according to the amplitude of the current signal that receives, concrete adjustment standard is: expectation PGA has optimum noise factor in the time of high-gain, expectation PGA has the optimum linearity in the time of low gain, need the compromise of the linearity and noise factor in the time of intermediate gain, as shown in Table 1.
Table 1
But in existing P GA design, for the big as far as possible requirement of satisfying various communication environments, all with the noise factor of PGA and the linearity no matter gain how, all according to the highest requirement design, as shown in Table 2.
Table 2
Set-up mode shown in the table 2 is in order to make the PGA can both be general in various communication environments as far as possible.Be that existing P GA adopts fixing noise factor and the linearity at different gains, can not be according to noise factor and the linearity of the in good time adjustment PGA of the variation of gain, arranging like this can be wasted resources such as more electric current, silicon chip, increases the receiver power consumption, improved use cost.
Summary of the invention
The main technical problem to be solved in the present invention is, a kind of programmable amplifier and a kind of receiver are provided, can be according to the variation of the gain of programmable amplifier, dynamically adjust its noise factor and the linearity, make programmable amplifier under different communication environments, can both be in the optimal working state as far as possible, to economize on resources, reduce use cost.
For solving the problems of the technologies described above, the invention provides a kind of programmable amplifier, comprise load circuit, switching circuit and transconductance circuit, the power end of described load circuit is connected with VDD, input is connected with the output of described switching circuit, the input of described switching circuit is connected with the output of described transconductance circuit, the earth terminal ground connection of described transconductance circuit; Described transconductance circuit comprises the mutual conductance branch road of a plurality of parallel connections, and each mutual conductance branch road is used for will changing into electric current from the signal that the signal input part of described amplifying circuit is imported and exporting from output; Described switching circuit comprises a plurality of switching branches for each mutual conductance branch road switching of control; Described amplifier also comprises gain control unit, and described gain control unit is connected with described switching circuit, is used for the switching that the transmit button control signal is given described each switching branches of described switching circuit control.
In an embodiment of the present invention, described gain control unit also is connected with described load circuit, is used for sending the load resistance that load control signal is controlled described load circuit.
In an embodiment of the present invention, described programmable amplifier also comprises the variable current source circuit, described transconductance circuit is by described variable current source circuit ground, described gain control unit also is connected with described variable current source circuit, be used for sending current controling signal to described variable current source circuit, control the size of described variable current source output current.
In an embodiment of the present invention, described programmable amplifier also comprises bias voltage circuit, and the power end of described bias voltage circuit is connected with described VDD, and input is connected with the signal input part of described transconductance circuit; Described gain control unit also is connected with described bias voltage circuit, is used for sending voltage control signal to described bias voltage circuit, controls the size of the output voltage of described bias voltage circuit.
In an embodiment of the present invention, the output of described bias voltage circuit is connected with the signal input part of described transconductance circuit by signal isolation circuit.
In an embodiment of the present invention, described transconductance circuit is the transconductance circuit based on NMOS pipe or PMOS pipe or triode or MESFET pipe or HEMT pipe.
In an embodiment of the present invention, described switching circuit is the switching circuit based on NMOS pipe or PMOS pipe or triode or MESFET pipe or HEMT pipe.
The present invention also provides a kind of receiver, and described receiver comprises programmable amplifier as mentioned above.
The invention has the beneficial effects as follows: the programmable amplifier among the present invention comprises load circuit, switching circuit and transconductance circuit, the power end of load circuit is connected with VDD, input is connected with the output of switching circuit, the input of switching circuit is connected with the output of transconductance circuit, the earth terminal ground connection of transconductance circuit; Transconductance circuit comprises the mutual conductance branch road of a plurality of parallel connections, and each mutual conductance branch road is used for the signal of importing from the signal input part of transconductance circuit is changed into electric current output; Switching circuit comprises a plurality of switching branches for each mutual conductance branch road switching of control; Amplifier also comprises the gain control unit that is connected with switching circuit, is used for the switching that output switch control signal is controlled each switching branches.The break-make that is each mutual conductance branch road of transconductance circuit among the present invention can be controlled by gain control unit, for example when needs reduce Amplifier Gain, but gain control unit transmit button control signal disconnects the wherein one or more mutual conductance branch road of transconductance circuit, after in running order mutual conductance branch road reduces, Amplifier Gain just reduces, the current density of in running order mutual conductance branch road is increased, the linearity of amplifier is improved; Otherwise then in running order mutual conductance branch road increases in the transconductance circuit, and Amplifier Gain improves, and its noiseproof feature is also just more good.Therefore the amplifier among the present invention can make amplifier can both be in the optimal working state under different communication environments according to its linearity of adjustment and the noiseproof feature of the change dynamics that gains, and avoids the waste of resources such as electric current and silicon chip, reduces use cost.
Description of drawings
Fig. 1 is the programmable amplifier structural representation of the embodiment of the invention one;
Fig. 2 is the programmable amplifier structural representation one of the embodiment of the invention two;
Fig. 3 is the programmable amplifier structural representation two of the embodiment of the invention two;
Fig. 4 is the programmable amplifier structural representation three of the embodiment of the invention two;
Fig. 5 is the programmable amplifier structural representation four of the embodiment of the invention two;
Fig. 6 is the programmable amplifier structural representation five of the embodiment of the invention two;
Fig. 7 is the programmable amplifier circuit structure diagram one of the embodiment of the invention three;
Fig. 8 is the variable current source circuit structure diagram shown in Fig. 7;
Fig. 9 is the programmable amplifier circuit structure diagram two of the embodiment of the invention three.
Embodiment
By reference to the accompanying drawings the present invention is described in further detail below by embodiment.
Embodiment one:
Amplifier in this example sees also Fig. 1, and programmable amplifier comprises load circuit, switching circuit and the transconductance circuit that is series at successively between VDD and the ground; Wherein, as shown in Figure 1, the power end of load circuit is connected with VDD, and input is connected with the output of switching circuit, and the input of switching circuit is connected with the output of transconductance circuit, the earth terminal end ground connection of transconductance circuit.Transconductance circuit in this example comprises the mutual conductance branch road of a plurality of parallel connections, each mutual conductance branch road is used for the external signal of importing from the signal input part of transconductance circuit is changed into electric current output, because each mutual conductance branch road parallel connection, so the electric current of the final output of transconductance circuit is each mutual conductance branch road output current sum.Switching circuit in this example comprises a plurality of switching branches for each mutual conductance branch road switching of control, and each switching branches can be the corresponding a plurality of mutual conductance branch roads of switching branches (namely a switching branches is controlled a plurality of mutual conductance branch roads) with corresponding relation between each mutual conductance branch road, also can be the corresponding mutual conductance branch road of a switching branches (i.e. mutual conductance branch road of a switching branches control), be preferably the corresponding mutual conductance branch road of a switching branches in this example.
Programmable amplifier in this example also comprises the gain control unit that is connected with switching circuit, gain control unit is used for output switch control signal and gives the switching circuit that is attached thereto, the switching of each switching branches that the control switch circuit comprises, the switching that is each mutual conductance branch road of transconductance circuit in this example can be controlled by gain control unit, specifically controls as follows:
When bigger according to the range value of the signal that receives, in the time of need reducing the gain of programmable amplifier, wherein one or more switching branches of gain control unit transmit button control signal cut-off switch circuit, and then the disconnection one or more mutual conductance branch road corresponding with above-mentioned switching branches, the in running order mutual conductance branch road of transconductance circuit will reduce like this, and then the gain of programmable amplifier is reduced, and because the minimizing of putting the in running order mutual conductance branch road in mutual conductance road, make the electric current increase that inputs in running order mutual conductance branch road via switching branches, and then the current density of in running order mutual conductance branch road is increased, the linearity of programmable amplifier is improved.
Otherwise, when less according to the range value of the signal that receives, when needing to increase the gain of programmable amplifier, gain control unit transmit button control signal is communicated with wherein one or more switching branches that is in off-state of switching circuit, and then the connection one or more mutual conductance branch road corresponding with above-mentioned switching branches, the in running order mutual conductance branch road of amplifying circuit is increased, therefore can increase the gain of programmable amplifier, the gain of programmable amplifier improves, and its noiseproof feature is also just more good.
As from the foregoing, relation between the gain of the programmable amplifier in this example, noise factor and the linearity is not that mode shown in table 2 arranges, but dynamically adjust relation between the gain of programmable amplifier and noise factor, the linearity by the number of the in running order mutual conductance branch road of gain control unit control transconductance circuit, make programmable amplifier under different communication environments, all be in the optimal working state as much as possible, avoid the waste of resource, reduce use cost.
Embodiment two:
Disclose among the embodiment one by the number of the in running order mutual conductance branch road of control transconductance circuit and dynamically adjusted the gain of programmable amplifier and the circuit structure diagram of the relation between mutual conductance coefficient and the linearity.This example also further discloses on the basis of embodiment one, and the relation between the gain of programmable amplifier and mutual conductance coefficient, the linearity is further adjusted, and is so that the relation between the three better meets actual needs, specific as follows:
Adjustment mode one: see also Fig. 2, on the basis of embodiment one, gain control unit in this example also is connected with load circuit, gain control unit also is used for sending load control signal to load circuit, with the load resistance in the control load circuit, and then the gain of control amplifier, it is finer and smoother to make that Amplifier Gain changes, the easier accurate requirement of satisfying system
Adjustment mode two: see also Fig. 3, on the basis of embodiment one, Programmable Logic Controller also can comprise the variable current source circuit, and transconductance circuit is by the variable current source circuit ground, and namely the bias current of transconductance circuit is decided by the direct current of variable current source.The current density of in running order like this mutual conductance branch road has increased the mode that can be controlled and adjust again, is convenient to the current density according to the in running order mutual conductance branch road of the meticulousr adjustment of the requirement of system.In addition, the variable current source circuit also is connected with gain control unit, gain control unit can send current controling signal to the variable current source circuit, the size of control variable current source output current, with the size of control transconductance circuit bias current, and then gain and the noise factor of adjustment programmable amplifier that can be meticulousr.
Adjustment mode three: the bias voltage of adjustable warping transconductance circuit is adjusted the relation between the gain of programmable amplifier, noise factor, the linearity.See also Fig. 4, on the basis of embodiment one, programmable amplifier also comprises bias voltage circuit, the input of bias voltage circuit is connected with VDD, output is connected with the signal input part of transconductance circuit, being transconductance circuit, the bias voltage that bias voltage circuit provides for transconductance circuit in this example of direct voltage is provided is adjustable, specifically be connected with bias voltage circuit by gain control unit, gain control unit transmission voltage control signal is realized with the output voltage size that changes the control bias voltage circuit to bias voltage circuit.Miss for the signal self-bias voltage circuit that prevents the input of transconductance circuit input, see also Fig. 5, the output of the bias voltage circuit in this example is connected with the signal input part of transconductance circuit by signal isolation circuit.
As from the foregoing, in this example more than the basis of embodiment one row further discloses several fine-tuning modes, the relation with between the gain of further adjustment programmable amplifier and noise factor, the linearity makes it be in more excellent operating state.But the adjustment mode in this example is not limited in above three kinds of adjustment modes, also can be above three kinds of combination in any of adjusting mode, for example, see also Fig. 6, adjustment mode shown in Figure 6 comprises adjustment mode one and adjustment mode two, and specifically selecting for use between adjustment mode one and the adjustment mode two can be selected according to actual conditions, can select wherein a kind of adjustment mode for use, also can select two kinds of adjustment modes simultaneously for use.Above-mentioned three kinds of concrete combinations of adjusting mode do not repeat them here.
Embodiment three:
For a better understanding of the present invention, be that the present invention will be further described for example with concrete switching circuit, transconductance circuit below.
Transconductance circuit in this example can be the transconductance circuit based on NMOS pipe or PMOS pipe or triode or MESFET pipe or HEMT pipe; Switching circuit also can be the switching circuit based on NMOS pipe or PMOS pipe or triode or MESFET pipe or HEMT pipe.Transconductance circuit can be selected identical device for use simultaneously with switching circuit, also can select different devices for use.Be that the present invention is described further for example based on the NMOS pipe all with transconductance circuit and switching circuit below.
See also Fig. 7, transconductance circuit 10 is differential transconductance circuit of both-end input, and signal is from its signal input part V
Ip, V
InInput, one end of load circuit 30 is connected with VDD, the other end is connected with switching circuit 20, switching circuit 20 comprises a plurality of switching branches, transconductance circuit 10 comprises and above-mentioned a plurality of switching branches mutual conductance branch road one to one, gain control unit 50 is controlled each switching branches respectively by control line 51, to control the switching of corresponding mutual conductance branch road.Programmable amplifier in this example also comprises variable current source circuit 40, variable current source circuit 40 is connected with the output of transconductance circuit 10, and be connected with gain control unit 50 by control line 53 simultaneously, gain control unit 50 is used for the size of control variable current source circuit 40 output currents (be transconductance circuit bias current is provided).Gain control unit 50 is connected with load circuit 30 by load control line 52, gain control unit 50 sends the size of the load resistance in the load control signal control load circuit 30, to control the size of current that inputs to the mutual conductance branch road via switching branches, with the current density on the control mutual conductance branch road.The variable current source circuit specifically sees also shown in Figure 8ly in this example, and the 401 reference direct currents with outside input change into voltage, give electric current output module 403 by switch arrays 402.Current controling signal line 53 reaches the purpose of control 403 output currents by changing the closure of switch in 402.Below concrete control procedure is illustrated.
See also Fig. 9, transconductance circuit 10 is single-ended transconductance circuit, comprises load circuit 30, switching circuit 20 and transconductance circuit 10, also comprises bias voltage circuit 70, and the power end of bias voltage circuit 70 is connected with VDD, (is isolation resistance R by signal isolation circuit
DC) be connected with the signal input part (being the grid of mutual conductance metal-oxide-semiconductor) of transconductance circuit 10.Gain control unit is connected with register by control line 54, is connected with load circuit 30 by control line 52, with the resistance of control load circuit 30, also is connected with switching circuit 20 by control line 51, to control the switching of corresponding mutual conductance branch road.Bias voltage circuit comprises variable current source 40, current supply switch module 62 and the bias voltage generation module 61 that is connected with diode, gain control unit 50 also is connected with each switching branches of current supply switch module 62 by control line 53, with the size of control variable current source 40 output currents, and then the size of control bias voltage circuit 70 output voltages.The gain control principle of programmable amplifier shown in Figure 9 and shown in Figure 7 similar does not repeat them here.
In summary, relation between the gain of programmable amplifier provided by the invention, noise factor and the linearity is not that mode shown in table 2 arranges, but dynamically adjust relation between the gain of programmable amplifier and noise factor, the linearity by the number of the in running order mutual conductance branch road of gain control unit control transconductance circuit, make programmable amplifier under different communication environments, all be in the optimal working state as much as possible, avoid the waste of resource, reduce use cost.
Above content be in conjunction with concrete execution mode to further describing that the present invention does, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. programmable amplifier, it is characterized in that comprising load circuit, switching circuit and transconductance circuit, the power end of described load circuit is connected with VDD, input is connected with the output of described switching circuit, the input of described switching circuit is connected with the output of described transconductance circuit, the earth terminal ground connection of described transconductance circuit; Described transconductance circuit comprises the mutual conductance branch road of a plurality of parallel connections, and each mutual conductance branch road is used for changing into electric current output from the signal that the signal input part of described transconductance circuit is imported; Described switching circuit comprises a plurality of switching branches for each mutual conductance branch road switching of control; Described amplifier also comprises gain control unit, and described gain control unit is connected with described switching circuit, is used for the switching that the transmit button control signal is given described each switching branches of described switching circuit control.
2. programmable amplifier as claimed in claim 1 is characterized in that, described gain control unit also is connected with described load circuit, is used for sending the load resistance that load control signal is controlled described load circuit.
3. programmable amplifier as claimed in claim 1 or 2, it is characterized in that, described programmable amplifier also comprises the variable current source circuit, described transconductance circuit is by described variable current source circuit ground, described gain control unit also is connected with described variable current source circuit, be used for sending current controling signal to described variable current source circuit, control the size of described variable current source output current.
4. programmable amplifier as claimed in claim 1 or 2 is characterized in that, described programmable amplifier also comprises bias voltage circuit, and the power end of described bias voltage circuit is connected with described VDD, and input is connected with the signal input part of described transconductance circuit; Described gain control unit also is connected with described bias voltage circuit, is used for sending voltage control signal to described bias voltage circuit, controls the size of the output voltage of described bias voltage circuit.
5. programmable amplifier as claimed in claim 3 is characterized in that, described programmable amplifier also comprises bias voltage circuit, and the power end of described bias voltage circuit is connected with described VDD, and input is connected with the signal input part of described transconductance circuit; Described gain control unit also is connected with described bias voltage circuit, is used for sending voltage control signal to described bias voltage circuit, controls the size of the output voltage of described bias voltage circuit.
6. programmable amplifier as claimed in claim 4 is characterized in that, the output of described bias voltage circuit is connected with the signal input part of described transconductance circuit by signal isolation circuit.
7. as claim 6 programmable amplifier, it is characterized in that, described programmable amplifier also comprises the variable current source circuit, described transconductance circuit is by described variable current source circuit ground, described gain control unit also is connected with described variable current source circuit, be used for sending current controling signal to described variable current source circuit, control the size of described variable current source output current.
8. programmable amplifier as claimed in claim 1 or 2 is characterized in that, described transconductance circuit is the transconductance circuit based on NMOS pipe or PMOS pipe or triode or MESFET pipe or HEMT pipe.
9. programmable amplifier as claimed in claim 1 or 2 is characterized in that, described switching circuit is the switching circuit based on NMOS pipe or PMOS pipe or triode or MESFET pipe or HEMT pipe.
10. a receiver is characterized in that, described receiver comprises the programmable amplifier as described in each as claim 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110448328.6A CN103187940B (en) | 2011-12-28 | 2011-12-28 | A kind of programmable amplifier and a kind of receiver |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110448328.6A CN103187940B (en) | 2011-12-28 | 2011-12-28 | A kind of programmable amplifier and a kind of receiver |
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| CN103187940A true CN103187940A (en) | 2013-07-03 |
| CN103187940B CN103187940B (en) | 2016-08-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901644A (en) * | 2014-03-07 | 2015-09-09 | 安凯(广州)微电子技术有限公司 | Gain circuit |
| CN106153084A (en) * | 2016-08-24 | 2016-11-23 | 成都芯进电子有限公司 | A kind of magnetic sensitivity temperature-compensation circuit and proframmable linear Hall sensor chip |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080088374A1 (en) * | 2006-10-13 | 2008-04-17 | Mediatek Inc. | Variable gain amplifiers |
| US20100123520A1 (en) * | 2008-11-19 | 2010-05-20 | Supertex, Inc. | Low Noise Binary-Coded Gain Amplifier and Method for Time-Gain Compensation in Medical Ultrasound Imaging |
| CN201846315U (en) * | 2010-09-20 | 2011-05-25 | 东南大学 | Digital variable gain amplifier |
-
2011
- 2011-12-28 CN CN201110448328.6A patent/CN103187940B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080088374A1 (en) * | 2006-10-13 | 2008-04-17 | Mediatek Inc. | Variable gain amplifiers |
| US20100123520A1 (en) * | 2008-11-19 | 2010-05-20 | Supertex, Inc. | Low Noise Binary-Coded Gain Amplifier and Method for Time-Gain Compensation in Medical Ultrasound Imaging |
| CN201846315U (en) * | 2010-09-20 | 2011-05-25 | 东南大学 | Digital variable gain amplifier |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901644A (en) * | 2014-03-07 | 2015-09-09 | 安凯(广州)微电子技术有限公司 | Gain circuit |
| CN106153084A (en) * | 2016-08-24 | 2016-11-23 | 成都芯进电子有限公司 | A kind of magnetic sensitivity temperature-compensation circuit and proframmable linear Hall sensor chip |
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| CN103187940B (en) | 2016-08-24 |
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