CN103187940B - A kind of programmable amplifier and a kind of receiver - Google Patents
A kind of programmable amplifier and a kind of receiver Download PDFInfo
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- CN103187940B CN103187940B CN201110448328.6A CN201110448328A CN103187940B CN 103187940 B CN103187940 B CN 103187940B CN 201110448328 A CN201110448328 A CN 201110448328A CN 103187940 B CN103187940 B CN 103187940B
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- programmable amplifier
- amplifier
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- mutual conductance
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Abstract
The invention discloses a kind of programmable amplifier and receiver, controlled the break-make of each mutual conductance branch road of transconductance circuit by gain control unit to control the number of in running order mutual conductance branch road, and then adjust gain, relation between noise coefficient and the linearity.When needing the gain reducing amplifier, gain control unit sends switch controlling signal and disconnects the wherein one or more mutual conductance branch road of transconductance circuit, after in running order mutual conductance branch road reduces, the gain of amplifier just reduces, the electric current density of in running order mutual conductance branch road increases, and makes the linearity of amplifier improve；Otherwise, then in running order in transconductance circuit mutual conductance branch road increases, and the gain of amplifier improves, and its noiseproof feature is the best.Therefore the amplifier in the present invention can adjust its linearity and noiseproof feature dynamically according to the change of gain, makes amplifier can be in the duty of optimum under different communication environments, reduces use cost.
Description
Technical field
The present invention relates to amplifying circuit technical field, concrete a kind of programmable amplifier and a kind of receiver.
Background technology
In a communications system, receiver needs to process multiple different communication environment, such as at the useful signal received
The when that amplitude being the least, the sensitivity needing receiver is best, and the gain now needing receiver is maximum, and noise coefficient is minimum；
Amplitude at the useful signal received by receiver is not the least, and specific sensitivity is larger, but now has other interference
Exist, need to consider the linearity of receiver this time.Therefore receiver the most all includes a programmable amplifier
(PGA), going to adjust dynamically the gain of PGA with the amplitude according to the signal being currently received, concrete adjustment standard is: high-gain
When expectation PGA have optimum noise coefficient, the when of low gain expect PGA have optimum the linearity, intermediate gain
Time need the linearity and noise coefficient compromise, as shown in Table 1.
Table 1
But in existing PGA designs, for the biggest requirement meeting various communication environment, all making an uproar PGA
The no matter gain of sonic system number and the linearity how, all designs according to highest demand, as shown in Table 2.
Table 2
Set-up mode shown in table 2 is to make the PGA can be general in various communication environments as far as possible.The most existing
PGA uses fixing noise coefficient and the linearity for different gain, it is impossible to according to the in good time adjustment PGA's of the change of gain
Noise coefficient and the linearity, such resources such as can wasting more electric current, silicon chip that arranges, increase receiver power consumption, improve
Use cost.
Summary of the invention
The main technical problem to be solved in the present invention is to provide a kind of programmable amplifier and a kind of receiver, can basis
The change of the gain of programmable amplifier, dynamically adjusts its noise coefficient and the linearity, makes programmable amplifier exist as far as possible
The duty of optimum can be under different communication environments, to economize on resources, reduce use cost.
For solving above-mentioned technical problem, the present invention provides a kind of programmable amplifier, including load circuit, on-off circuit and
Transconductance circuit, the power end of described load circuit is connected with VDD, and input is connected with the outfan of described on-off circuit, described
The input of on-off circuit is connected with the outfan of described transconductance circuit, the earth terminal ground connection of described transconductance circuit；Described mutual conductance
Circuit includes the mutual conductance branch road of multiple parallel connection, and each mutual conductance branch road is for the letter that will input from the signal input part of described amplifying circuit
Number change into electric current and export from outfan；Described on-off circuit includes the multiple switches for controlling each mutual conductance branch road switching
Branch road；Described amplifier also includes that gain control unit, described gain control unit are connected with described on-off circuit, is used for sending
Switch controlling signal controls the switching of described each switching branches to described on-off circuit.
In an embodiment of the present invention, described gain control unit is also connected with described load circuit, is used for sending
Load control signal controls the load resistance in described load circuit.
In an embodiment of the present invention, described programmable amplifier also includes variable current source circuit, described mutual conductance
Circuit passes through described variable current source circuit ground, and described gain control unit is also connected with described variable current source circuit, uses
In transmission current controling signal to described variable current source circuit, control the size of described variable current source output electric current.
In an embodiment of the present invention, described programmable amplifier also includes bias voltage circuit, described biased electrical
The power end of volt circuit is connected with described VDD, and input is connected with the signal input part of described transconductance circuit；Described gain control
Unit is also connected with described bias voltage circuit, is used for sending voltage control signal to described bias voltage circuit, controls described
The size of the output voltage of bias voltage circuit.
In an embodiment of the present invention, the outfan of described bias voltage circuit passes through signal isolation circuit with described
The signal input part of transconductance circuit connects.
In an embodiment of the present invention, described transconductance circuit be based on NMOS tube or PMOS or audion or
MESFET pipe or the transconductance circuit of HEMT pipe.
In an embodiment of the present invention, described on-off circuit be based on NMOS tube or PMOS or audion or
MESFET pipe or the on-off circuit of HEMT pipe.
Present invention also offers a kind of receiver, described receiver includes programmable amplifier described above.
The invention has the beneficial effects as follows: the programmable amplifier in the present invention includes load circuit, on-off circuit and mutual conductance
Circuit, the power end of load circuit is connected with VDD, and input is connected with the outfan of on-off circuit, the input of on-off circuit
It is connected with the outfan of transconductance circuit, the earth terminal ground connection of transconductance circuit；Transconductance circuit includes the mutual conductance branch road of multiple parallel connection, respectively
Mutual conductance branch road is for changing into the signal inputted from the signal input part of transconductance circuit electric current output；On-off circuit include for
Control multiple switching branches of each mutual conductance branch road switching；Amplifier also includes the gain control unit being connected with on-off circuit, uses
The switching of each switching branches is controlled in output switch control signal.The i.e. break-make of each mutual conductance branch road of transconductance circuit in the present invention
Can be controlled by gain control unit, such as, when needing the gain reducing amplifier, gain control unit can send switch
Control signal disconnects the wherein one or more mutual conductance branch road of transconductance circuit, after in running order mutual conductance branch road reduces,
The gain of amplifier just reduces, and makes the electric current density of in running order mutual conductance branch road increase, makes the linearity of amplifier carry
High；Otherwise, then in running order in transconductance circuit mutual conductance branch road increases, and the gain of amplifier improves, and its noiseproof feature is also
The best.Therefore the amplifier in the present invention can adjust its linearity and noiseproof feature dynamically according to the change of gain, makes to put
Big device can be in the duty of optimum under different communication environments, it is to avoid the waste of the resource such as electric current and silicon chip, reduces
Use cost.
Accompanying drawing explanation
Fig. 1 is the programmable amplifier structural representation of the embodiment of the present invention one；
Fig. 2 is the programmable amplifier structural representation one of the embodiment of the present invention two；
Fig. 3 is the programmable amplifier structural representation two of the embodiment of the present invention two；
Fig. 4 is the programmable amplifier structural representation three of the embodiment of the present invention two；
Fig. 5 is the programmable amplifier structural representation four of the embodiment of the present invention two；
Fig. 6 is the programmable amplifier structural representation five of the embodiment of the present invention two；
Fig. 7 is the programmable amplifier circuit structure diagram one of the embodiment of the present 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 present invention three.
Detailed description of the invention
Combine accompanying drawing below by detailed description of the invention the present invention is described in further detail.
Embodiment one:
Amplifier in this example, refers to Fig. 1, and programmable amplifier includes the load being sequentially connected in series between VDD and ground
Circuit, on-off circuit and transconductance circuit；Wherein, as it is shown in figure 1, the power end of load circuit is connected with VDD, input and switch
The outfan of circuit connects, and the input of on-off circuit is connected with the outfan of transconductance circuit, the earth terminal termination of transconductance circuit
Ground.Transconductance circuit in this example includes the mutual conductance branch road of multiple parallel connection, and each mutual conductance branch road is for defeated from the signal of transconductance circuit
The external signal entering end input changes into electric current output, due to each mutual conductance branch circuit parallel connection, the electricity that therefore transconductance circuit finally exports
Stream exports electric current sum for each mutual conductance branch road.On-off circuit in this example includes for controlling the multiple of each mutual conductance branch road switching
Corresponding relation between switching branches, and each switching branches with each mutual conductance branch road can be the corresponding multiple mutual conductances of switching branches
Branch road (i.e. one switching branches controls multiple mutual conductance branch roads), it is possible to be the corresponding mutual conductance branch road (i.e. of a switching branches
Individual switching branches controls a mutual conductance branch road), this example is preferably the corresponding mutual conductance branch road of a switching branches.
Programmable amplifier in this example also includes the gain control unit being connected with on-off circuit, and gain control unit is used
Give the on-off circuit being attached thereto in output switch control signal, control the switching of each switching branches that on-off circuit includes, i.e.
In this example, the switching of each mutual conductance branch road of transconductance circuit can be controlled by gain control unit, and concrete control is as follows:
When relatively big according to the range value of the signal received, when needing the gain reducing programmable amplifier, gain control
Unit sends switch controlling signal and disconnects wherein one or more switching branches of on-off circuit, and then disconnection is propped up with above-mentioned switch
The one or more mutual conductance branch road that road is corresponding, the in running order mutual conductance branch road of such transconductance circuit will reduce, Jin Erke
Make the gain reduction of programmable amplifier, and owing to putting the minimizing of the in running order mutual conductance branch road in mutual conductance road, make via opening
Close branch road and input to the electric current increase of in running order mutual conductance branch road, and then make the electricity of in running order mutual conductance branch road
Current density increases, and makes the linearity of programmable amplifier improve.
Otherwise, when the range value according to the signal received is less, needs the gain increasing programmable amplifier, gain
Control unit sends switch controlling signal makes the switching branches that wherein one or more is off of on-off circuit connect,
And then the one or more mutual conductance branch road that connection is corresponding with above-mentioned switching branches, the mutual conductance making amplifying circuit in running order is propped up
Road increases, and therefore can increase the gain of programmable amplifier, and the gain of programmable amplifier improves, and its noiseproof feature is also more
Good.
From the foregoing, it will be observed that relation between the gain of programmable amplifier, noise coefficient and the linearity in this example not as
Mode shown in table 2 is configured, but controls, by gain control unit, the mutual conductance branch road that transconductance circuit is in running order
Number dynamically adjust the relation between the gain of programmable amplifier and noise coefficient, the linearity, make programmable amplifier
Under different communication environments, it is in the duty of optimum the most as far as possible, it is to avoid the waste of resource, reduces use cost.
Embodiment two:
Embodiment one discloses and is dynamically adjusted by the number controlling the in running order mutual conductance branch road of transconductance circuit
The circuit structure diagram of the relation between gain and mutual conductance coefficient and the linearity of whole programmable amplifier.This example it is further disclosed that
On the basis of embodiment one, the relation between gain and mutual conductance coefficient, the linearity of programmable amplifier entered one
Successive step, so that the relation between three better meets and is actually needed, specific as follows:
Adjustment mode one: refer to Fig. 2, on the basis of embodiment one, the gain control unit in this example also with load
Circuit connect, gain control unit be additionally operable to send load control signal to load circuit, to control the load in load circuit
Resistance, and then control the gain of amplifier so that the change in gain of amplifier is finer and smoother, it is easier to meet precisely wanting of system
Ask
Adjustment mode two: refer to Fig. 3, on the basis of embodiment one, Programmable Logic Controller may also include variable current
Source circuit, transconductance circuit is decided by variable current source by the bias current of variable current source circuit ground, i.e. transconductance circuit
DC current.The electric current density of the most in running order mutual conductance branch road adds again a side that can be controlled and adjust
Formula, it is simple to according to the electric current density adjusting in running order mutual conductance branch road that the requirement of system is finer.It addition, it is variable
Current source circuit is also connected with gain control unit, and gain control unit can send current controling signal to variable current source electricity
Road, controls the size of variable current source output electric current, to control the size of transconductance circuit bias current, and then can be finer
Adjust the gain of programmable amplifier and noise coefficient.
Adjustment mode three: the bias voltage of adjustable warping transconductance circuit adjusts the gain of programmable amplifier, noise system
Relation between number, the linearity.Referring to Fig. 4, on the basis of embodiment one, programmable amplifier also includes biased electrical piezoelectricity
Road, the input of bias voltage circuit is connected with VDD, and outfan is connected with the signal input part of transconductance circuit, is mutual conductance electricity
Road provides bias voltage circuit in this example of DC voltage to be adjustable for the bias voltage that transconductance circuit provides, especially by gain
Control unit is connected with bias voltage circuit, and gain control unit sends voltage control signal to bias voltage circuit to change control
The output voltage size of bias voltage circuit processed realizes.For the signal automatic biasing electricity preventing transconductance circuit input from inputting
Volt circuit is missed, and the outfan referring to the bias voltage circuit in Fig. 5, this example passes through signal isolation circuit and transconductance circuit
Signal input part connects.
From the foregoing, it will be observed that the basic row in embodiment one further discloses above several fine-tuning mode, to enter one in this example
Relation between the gain of successive step programmable amplifier and noise coefficient, the linearity so that it is be in more excellent duty.But
Adjustment mode in this example is not limited in three of the above and adjusts mode, can be also the combination in any of three of the above adjustment mode,
Such as, referring to Fig. 6, the adjustment mode shown in Fig. 6 includes adjustment mode one and adjustment mode two, and adjusts mode one and adjust
Concrete selection between mode two can select according to practical situation, can be selected for one of which and adjusts mode, it is possible to selects simultaneously
Mode is adjusted with two kinds.Above-mentioned three kinds of concrete combinations adjusting mode do not repeat them here.
Embodiment three:
In order to be better understood from the present invention, as a example by concrete on-off circuit, transconductance circuit, the present invention is done into one below
Step explanation.
Transconductance circuit in this example may be based on NMOS tube or PMOS or audion or MESFET pipe or HEMT pipe across
Conductive path；On-off circuit is alternatively based on NMOS tube or PMOS or audion or MESFET pipe or the on-off circuit of HEMT pipe.
Transconductance circuit and on-off circuit can select identical device simultaneously, it is possible to select different devices.Below with transconductance circuit and opening
Close circuit and be all based on as a example by NMOS tube that the present invention is described further.
Referring to Fig. 7, transconductance circuit 10 is the differential transconductance circuit of double-width grinding, and signal is from its signal input part Vip、Vin
Input, one end of load circuit 30 is connected with VDD, and the other end is connected with on-off circuit 20, and on-off circuit 20 includes multiple switch
Branch road, transconductance circuit 10 includes and above-mentioned multiple switching branches mutual conductance branch road one to one, and gain control unit 50 is by control
Line 51 processed controls each switching branches respectively, to control the switching of corresponding mutual conductance branch road.Programmable amplifier in this example also includes
Variable current source circuit 40, variable current source circuit 40 is connected with the outfan of transconductance circuit 10, and simultaneously by control line 53
Being connected with gain control unit 50, gain control unit 50 is used for controlling variable current source circuit 40 and exports electric current and (be mutual conductance
Circuit provide bias current) size.Gain control unit 50 is connected with load circuit 30 by load control line 52, gain control
Unit 50 processed sends load control signal and controls the size of the load resistance in load circuit 30, defeated via switching branches to control
Enter the size of current to mutual conductance branch road, to control the electric current density on mutual conductance branch road.In this example, variable current source circuit specifically please
Shown in Figure 8, the 401 reference DC currents that outside is inputted, change into voltage, give electric current by switch arrays 402 defeated
Go out module 403.Current controling signal line 53, by changing the Guan Bi of 402 breaker in middle, reaches to control the purpose of 403 output electric currents.
Below concrete control process is illustrated.
Gain control unit 50 can be connected with depositor by control line 54, and the numerical value of depositor derives from this amplification of application
The system requirements of device.Such as when the amplitude that the system applying this amplifier detects input signal is the least, amplification can be improved
The gain of device, when apply this amplifier system detect that input signal amplitude is bigger, or exist certain interference time
Wait, it will the gain of step-down amplifier, improve and the operation of step-down amplifier gain can by write in depositor suitably
Yield value realizes.Such as: when gain control unit 50 by control line a to on-off circuit 20 in be attached thereto a pair
When the VG input of metal-oxide-semiconductor (Mc11 and Mc21) is 0, metal-oxide-semiconductor Mc11 and Mc21 disconnects, the most either flows through Mc11 to MA11's
DC current is still the most cut-off from the path of the alternating current of MA11 to Mc11, and the another side of differential pair is to flow through Mc12 to arrive
The path of the DC current of MA12 and the alternating current from MA12 to Mc12 is also turned off and then decreases and participates in the active of amplification
The number of device MOS, reduces the gain of amplifier, adds other electric current densities participating in the metal-oxide-semiconductor amplified, adds and put
The linearity of big device.Accordingly, when needs increase gain, gain control unit 50 passes through control line a in on-off circuit 20
A pair metal-oxide-semiconductor (Mc11 and Mc21) being attached thereto VG input for Vbc (Vbc be through optimization make amplifier gain and
Best one bias voltage of noiseproof feature) time, to connect metal-oxide-semiconductor Mc11 and Mc21, increase the number of metal-oxide-semiconductor in transconductance circuit
?.
Referring to Fig. 9, transconductance circuit 10 is single-ended transconductance circuit, including load circuit 30, on-off circuit 20 and mutual conductance electricity
Road 10, also includes that bias voltage circuit 70, the power end of bias voltage circuit 70 are connected with VDD, by signal isolation circuit (i.e.
Isolation resistance RDC) be connected with the signal input part (i.e. the grid of mutual conductance metal-oxide-semiconductor) of transconductance circuit 10.Gain control unit is by control
Line 54 processed is connected with depositor, is connected with load circuit 30 by control line 52, to control the resistance of load circuit 30, also by
Control line 51 is connected with on-off circuit 20, to control the switching of corresponding mutual conductance branch road.Bias voltage circuit includes variable current
Source 40, current supply switch module 62 and with diode connect bias voltage generation module 61, gain control unit 50 also by
Control line 53 is connected with each switching branches of current supply switch module 62, exports the size of electric current controlling variable current source 40,
And then control the size of bias voltage circuit 70 output voltage.The gain control principle of the programmable amplifier shown in Fig. 9 and Fig. 7
Shown similar, do not repeat them here.
In summary, the relation between the present invention provides the gain of programmable amplifier, noise coefficient and the linearity is also
Non-mode as shown in table 2 is configured, but controls, by gain control unit, the mutual conductance that transconductance circuit is in running order
The number of branch road dynamically adjusts the relation between the gain of programmable amplifier and noise coefficient, the linearity, makes able to programme putting
Big device is in the duty of optimum under different communication environments the most as far as possible, it is to avoid the waste of resource, reduces and uses into
This.
Above content is to combine specific embodiment further description made for the present invention, it is impossible to assert this
Bright being embodied as is confined to these explanations.For general technical staff of the technical field of the invention, do not taking off
On the premise of present inventive concept, it is also possible to make some simple deduction or replace, all should be considered as belonging to the protection of the present invention
Scope.
Claims (10)
1. a programmable amplifier, it is characterised in that include load circuit, on-off circuit and transconductance circuit, described load circuit
Power end be connected with VDD, input is connected with the outfan of described on-off circuit, and the input of described on-off circuit is with described
The outfan of transconductance circuit connects, the earth terminal ground connection of described transconductance circuit；Described transconductance circuit includes the mutual conductance of multiple parallel connection
Branch road, each mutual conductance branch road for changing into electric current output by the signal inputted from the signal input part of described transconductance circuit；Described
On-off circuit includes the multiple switching branches for controlling each mutual conductance branch road switching；Described amplifier also includes gain control list
Unit, described gain control unit is connected with described on-off circuit, is used for sending switch controlling signal and controls to described on-off circuit
The switching of each described switching branches.
2. programmable amplifier as claimed in claim 1, it is characterised in that described gain control unit is also electric with described load
Road connects, and controls the load resistance in described load circuit for sending load control signal.
3. programmable amplifier as claimed in claim 1 or 2, it is characterised in that described programmable amplifier also includes variable
Current source circuit, described transconductance circuit pass through described variable current source circuit ground, described gain control unit also with described can
Time-dependent current source circuit connects, and is used for sending current controling signal to described variable current source circuit, controls described variable current source
The size of circuit output current.
4. programmable amplifier as claimed in claim 1 or 2, it is characterised in that described programmable amplifier also includes biasing
Potential circuit, the power end of described bias voltage circuit is connected with described VDD, and outfan inputs with the signal of described transconductance circuit
End connects；Described gain control unit is also connected with described bias voltage circuit, be used for sending voltage control signal to described partially
Put potential circuit, control the size of the output voltage of described bias voltage circuit.
5. programmable amplifier as claimed in claim 3, it is characterised in that described programmable amplifier also includes bias voltage
Circuit, the power end of described bias voltage circuit is connected with described VDD, and outfan connects with the signal input part of described transconductance circuit
Connect；Described gain control unit is also connected with described bias voltage circuit, is used for sending voltage control signal to described biased electrical
Volt circuit, controls the size of the output voltage of described bias voltage circuit.
6. programmable amplifier as claimed in claim 4, it is characterised in that the outfan of described bias voltage circuit is by letter
Number isolation circuit be connected with the signal input part of described transconductance circuit.
7. programmable amplifier as claimed in claim 6, it is characterised in that described programmable amplifier also includes variable current
Source circuit, described transconductance circuit pass through described variable current source circuit ground, described gain control unit also with described can power transformation
Current source circuit connects, and is used for sending current controling signal to described variable current source circuit, controls described variable current source circuit
The size of output electric current.
8. programmable amplifier as claimed in claim 1 or 2, it is characterised in that described transconductance circuit be based on NMOS tube or
PMOS or audion or MESFET are managed or the transconductance circuit of HEMT pipe.
9. programmable amplifier as claimed in claim 1 or 2, it is characterised in that described on-off circuit be based on NMOS tube or
PMOS or audion or MESFET are managed or the on-off circuit of HEMT pipe.
10. a receiver, it is characterised in that described receiver includes amplification able to programme as described in any one of claim 1-9
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
|---|---|---|---|
| CN201110448328.6A CN103187940B (en) | 2011-12-28 | 2011-12-28 | A kind of programmable amplifier and a kind of receiver |
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| Publication Number | Publication Date |
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| CN103187940A CN103187940A (en) | 2013-07-03 |
| CN103187940B true CN103187940B (en) | 2016-08-24 |
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| CN201110448328.6A Active CN103187940B (en) | 2011-12-28 | 2011-12-28 | A kind of programmable amplifier and a kind of receiver |
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| CN104901644A (en) * | 2014-03-07 | 2015-09-09 | 安凯(广州)微电子技术有限公司 | Gain circuit |
| CN106153084B (en) * | 2016-08-24 | 2018-11-27 | 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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201846315U (en) * | 2010-09-20 | 2011-05-25 | 东南大学 | Digital variable gain amplifier |
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| US7701288B2 (en) * | 2006-10-13 | 2010-04-20 | Mediatek Inc. | Variable gain amplifiers |
| US7948315B2 (en) * | 2008-11-19 | 2011-05-24 | Supertex, Inc. | Low noise binary-coded gain amplifier and method for time-gain compensation in medical ultrasound imaging |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201846315U (en) * | 2010-09-20 | 2011-05-25 | 东南大学 | Digital variable gain amplifier |
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