CN101471636B - Amplifier with variable gain and high dynamic range - Google Patents
Amplifier with variable gain and high dynamic range Download PDFInfo
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- CN101471636B CN101471636B CN200710194392XA CN200710194392A CN101471636B CN 101471636 B CN101471636 B CN 101471636B CN 200710194392X A CN200710194392X A CN 200710194392XA CN 200710194392 A CN200710194392 A CN 200710194392A CN 101471636 B CN101471636 B CN 101471636B
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Abstract
A high dynamic range amplifier with variable gain comprises an amplifier module, a control unit and a circuit for regulating output current capacity. The amplifier module is used for amplifying an input signal and consists of a plurality of amplifier units which are coupled with each other in parallel and have different gain values; the control unit is used for enabling at least one amplifier unit according to a gain control signal, and at least one enabled amplifier unit is used for responding to the input signal to output a current signal; the circuit for regulating output current capacity is used for receiving a current signal output by at least one enabled amplifier unit and regulating the strength of the current signal under the control of the control unit to output an output signal correspondingly, wherein, each of the amplifier units is coupled with the circuit for regulating output current capacity in series.
Description
Technical field
The invention relates to a kind of amplifier, and particularly relevant for a kind of amplifier with variable gain and high dynamic range.
Background technology
In communication field, employed receiver when receiving signal often uses dynamic amplifier to amplify the signal that is received.When the amplitude of reception input signal changed, dynamically Amplifier Gain will change to keep the size of output signal thereupon.
Please refer to Fig. 1, it has shown that traditional use electric current controls the circuit diagram of the dynamic amplifier of device (current steering circuit).Dynamically amplifier 100 is to utilize electric current to control device 140, with according to controlling signal V
CTLVoltage adjust the gain of dynamic amplifier 100.When the amplitude of input signal Vi becomes big, controlling signal V
CTLVoltage can step-down to reduce output current i
oSize, to reduce the gain of dynamic amplifier 100.Yet, when the amplitude of input signal Vi is excessive, the transistor Q of differential amplifier 120
121And Q
122To operate in the saturation region, make the output signal distortion.Therefore, even reduced output current i this moment
oSize, still can't solve output current i
oThe problem of wave distortion.The old friend, traditional dynamic amplifier 100 has the linearity can't reach the shortcoming of desired requirement inadequately greatly.The linearity herein is meant, allows the scope of amplitude of the input signal that output signal can distortion.
In order to improve the linearity, tradition utilizes the dynamic amplifier of degeneration resistance circuit adjustment gain (Degenerating Resistance Tuning) to be suggested, and its circuit diagram as shown in Figure 2.This degeneration resistance circuit is reached by a metal-oxide semiconductor (MOS) (Metal Oxide Semiconductor) field-effect transistor (MOS transistor).Dynamically amplifier 200 utilizes the grid-control voltage V of controlling filed effect transistor 240
CTL', the equivalent resistance when changing field-effect transistor 240 conductings is to adjust the gain of dynamic amplifier 200.So, can allow the scope of amplitude of the receivable input signal Vi that the output signal of dynamic amplifier 200 can distortion increase, to improve the dynamic range of dynamic amplifier 200.Because dynamically the gain of amplifier 200 is relevant with the resistance value of field-effect transistor 240, yet, when the frequency of input signal Vi was too high, the parasitic capacitance of degeneration resistance circuit will increase for the influence of gain, and makes that the yield value of dynamic amplifier 200 when high frequency can't accurately be regulated and control.Simultaneously, when receiving the high frequency input signal, dynamically the linearity of amplifier 200 also is difficult to control.
In addition, in U.S. Patent number 3,728, a high dynamic range radio frequency receiver (Radio Receiver With Wide Dynamic Range) is also proposed in No. 633.Its receiver system comprises two receivers, and first receiver is controlled by AGC bias voltage (AGC bias), and second receiver controlled by the AGC (Delayed AGC) after postponing.When input signal position standard (signal input levels) was big more, the position standard of AGC was big more.AGC is during greatly to a crossover point (Cross-Over Point), and first receiver gain is zero, and second receiver begins effect.AGC after this receiver system utilizes the AGC bias voltage and postpones switches two receivers, and does not use switch.
And in No. 5,625,321, the U.S. Patent number variable gain amplifier device (Variable Gain Amplifier Apparatus) is also proposed, used two variable gain amplifiers (variable gain amplifier).The gain ratio of these two variable gain amplifiers (gain ratio) has complementary relationship (complementary relation), and is controlled by same gain controlling signal (gain control signal).When the yield value of a variable gain amplifier became big, the yield value of another variable gain amplifier diminished.
Be the unmanageable problem of the linearity that solves above-mentioned dynamic amplifier 200, United States Patent (USP) 6,049,251 also disclose a kind of high dynamic range variable gain amplifier circuit (Very-Wide-Range Variable-Gain Amplifier).As shown in Figure 3A, it has shown the circuit diagram of above-mentioned high dynamic range variable gain amplifier.This high dynamic range variable gain amplifier comprises two amplifier circuits 320 and 340.Please refer to Fig. 3 B and Fig. 3 C, it has shown the detailed circuit diagram of amplifier circuit 320 and 340 respectively.R among Fig. 3 B
E1Resistance value less, so amplifier circuit 320 has the high-gain values and the low linearity.R among Fig. 3 C
E2Resistance value bigger, so amplifier circuit 340 has low gain value and high linearity.Amplifier circuit 320 and 340 is coupled in parallel, and controls its yield value by automatic gain controlling signal AGC1 and AGC2 respectively.Since the gain difference of amplifier circuit 320 and 340, can reach amplifier with two different linearities, and can improve dynamic range.
Yet,, need again at least one amplifier circuit in parallel if will improve the scope of acceptable input signal again.At this moment, will make required assembly increase, cost also improves thereupon, and increases the complexity of entire circuit.Therefore, how improving the scope of the receivable input signal of amplifier, can not improve circuit complexity again, is one of problem of endeavouring of industry.
Summary of the invention
The object of the present invention is to provide a kind of amplifier with variable gain and high dynamic range, dynamic range that can boost amplifier can reduce required circuit unit again and reduce circuit complexity.
For achieving the above object, amplifier with variable gain and high dynamic range provided by the invention comprises:
One amplifier module, in order to amplify an input signal, this amplifier module comprises a plurality of amplifier units, and those amplifier units are coupled in parallel, and the yield value of those amplifier units is different;
One control unit, in order to according to a gain controlling signal, activation is one of those amplifier units at least, at least one this amplifier unit of this that is enabled in order in response to this input signal to export a current signal; And
One circuit for regulating output current capacity, in order to be received from this current signal of this this at least one amplifier unit output that is enabled, and under the control of this control unit, regulate the size of this current signal, to export an output signal accordingly, respectively this amplifier unit and this circuit for regulating output current capacity are coupled in series;
Wherein, this control unit is controlled this circuit for regulating output current capacity according to this gain controlling signal.
Described amplifier with variable gain and high dynamic range, wherein, this gain controlling signal is big or small corresponding with this input signal, and this control unit comprises:
One pre-segmenting unit, in order to receive this gain controlling signal, and according to the size of this gain controlling signal, export a plurality of enable signals accordingly, with those amplifier units of difference activation, this pre-segmenting unit is regulated controlling signal in order to produce a section according to this gain controlling signal, this circuit for regulating output current capacity is regulated the size that controlling signal is regulated this current signal according to this section, when this gain controlling signal increased or reduces along with the time is linear, this section was regulated the waveform of controlling signal on time shaft and is essentially a sawtooth waveforms.
Described amplifier with variable gain and high dynamic range, wherein, this sawtooth waveforms is to have sluggish sawtooth waveforms.
Described amplifier with variable gain and high dynamic range, wherein, this pre-segmenting unit comprises:
One analog/digital converter is one first signal in order to change this gain controlling signal;
One digital/analog converter is one second signal in order to change this first signal; And
One subtracter after this gain controlling signal is deducted this second signal, produces this section and regulates controlling signal.
Described amplifier with variable gain and high dynamic range, wherein, this control unit also comprises a unit transducer, regulates the size of controlling signal in order to adjust this section, and this circuit for regulating output current capacity is regulated the size that controlling signal is regulated this current signal according to adjusted this section.
Described amplifier with variable gain and high dynamic range, wherein, this amplifier module comprises:
One first amplifier circuit comprises one first differential amplifier, in order to amplify this input signal;
One second amplifier circuit comprises:
One current source cell;
One second differential amplifier, in order to amplify this input signal, this second differential amplifier is coupled to this current source cell; And
One first resistor blocks, be coupled to this second differential amplifier, this first resistor blocks comprises a plurality of main resistors and a plurality of main switch, respectively this main switch is respectively at optionally conducting under the control of this control unit, the main switch of this of conducting uses so that corresponding main resistor has current path, and the yield value of this second differential amplifier is relevant with the resistance value of the main resistor with current path; And
One selected cell, be used under the control of this control circuit, this first differential amplifier of activation and this second differential amplifier the two one of, make this first differential amplifier of activation and this second differential amplifier the two one of output correspond to this current signal of this input signal.
Described amplifier with variable gain and high dynamic range, wherein, this first differential amplifier has a first transistor and a transistor seconds, the base stage of this first transistor and this transistor seconds is in order to receive this input signal, and the emitter-base bandgap grading of this first transistor and this transistor seconds all is coupled to earthed voltage;
Wherein, this current source cell comprises one first current source and one second current source, this second differential amplifier comprises one the 3rd transistor AND gate 1 the 4th transistor, those main resistors comprise a plurality of first main resistor and a plurality of second main resistor, the 3rd transistor AND gate the 4th transistorized base stage is in order to receive this input signal, the 3rd transistor AND gate the 4th transistorized emitter-base bandgap grading is coupled to this first current source and this second current source respectively, the 3rd transistorized emitter-base bandgap grading also is coupled to those first main resistors, the 4th transistorized emitter-base bandgap grading also is coupled to those second main resistors, and each first main resistor electrically connects by a main switch and this second main resistor;
Wherein, the collection utmost point of this first transistor and this transistor seconds is coupled to the 3rd transistor AND gate the 4th transistorized collection utmost point respectively, and the collection utmost point of this first transistor and this transistor seconds is in order to export this current signal.
Described amplifier with variable gain and high dynamic range, wherein, also comprise a signal input end, a direct current bias voltage buffer circuit and a bias circuit, this signal input end is in order to receive this input signal, this Dc bias buffer circuit is coupled between this signal input end and this amplifier module, and this bias circuit is in order to provide Dc bias to this amplifier module.
Described amplifier with variable gain and high dynamic range, wherein, this Dc bias buffer circuit comprises four capacitors, one end of these four capacitors is coupled to this signal input end, the other end of these four capacitors is coupled to this first transistor, this transistor seconds, the 3rd transistor and the 4th transistorized base stage respectively, and this bias circuit is in order to provide Dc bias to this first transistor, this transistor seconds, the 3rd transistor and the 4th transistorized base stage.
Described amplifier with variable gain and high dynamic range, wherein, this amplifier module also comprises one second resistor blocks, comprise a plurality of first auxiliary resistors, a plurality of second auxiliary resistor and a plurality of auxiliary switch, the 3rd transistorized base stage also is coupled to those first auxiliary resistors, the 4th transistorized base stage also is coupled to those second auxiliary resistors, and each first auxiliary resistor electrically connects by an auxiliary switch and this second auxiliary resistor.
Described amplifier with variable gain and high dynamic range, wherein, this circuit for regulating output current capacity comprises one the 5th transistor, one the 6th transistor, one the 7th transistor and one the 8th transistor, the 6th transistor and the 7th transistorized collection extremely all are electrically connected to a supply voltage, the 5th transistor and the 6th transistorized emitter-base bandgap grading all are electrically connected to the collection utmost point of this first transistor, the 7th transistor and the 8th transistorized emitter-base bandgap grading all are coupled to the collection utmost point of this transistor seconds, the 5th transistorized base stage is electrically connected to the 8th transistorized base stage, the 6th transistorized base stage is electrically connected to the 7th transistorized base stage, and the voltage of the 5th transistor and the 6th transistorized base stage is controlled by this control unit;
Wherein, the 5th transistor and the 8th transistorized collection utmost point are in order to export this output signal.
Described amplifier with variable gain and high dynamic range, wherein, also comprise a matching unit, when this input signal is the signal of single-ended input, this matching unit converts this input signal that produces the both-end input in order to this input signal with single-ended input, and this first differential amplifier and second differential amplifier are in order to amplify this input signal of both-end input.
Amplifier with variable gain and high dynamic range provided by the present invention, by the different amplifier unit of a plurality of yield values of coupled in parallel, and shared magnitude of current regulating circuit, the dynamic range that improves amplifier can be reached, and the advantage of simplifying circuit can be reached.In addition, by using the Dc bias buffer circuit, reach the effect of the different amplifier circuit of quick switching.
Description of drawings
Fig. 1 shows traditional circuit diagram that uses electric current to control the dynamic amplifier of device.
Fig. 2 shows that tradition utilizes the circuit diagram of the dynamic amplifier of degeneration resistance circuit adjustment gain.
The circuit diagram of the gain-changeable amplifier circuit of the high dynamic range of Fig. 3 A demonstration United States Patent (USP) 6,049,251.
Fig. 4 shows the system block diagrams according to the amplifier with variable gain and high dynamic range of one embodiment of the invention.
One example of the detailed circuit diagram of the amplifier with variable gain and high dynamic range of Fig. 5 displayed map 4.
An example of the circuit diagram of pre-segmenting unit in Fig. 6 displayed map 5.
The gain controlling signal VC of the pre-segmenting unit of Fig. 7 A-7D displayed map 6 and section are regulated an example of the oscillogram of controlling signal VCseg.
Fig. 8 A and Fig. 8 B show the section adjusting controlling signal VCseg with sluggish sawtooth waveforms of the gain controlling signal VC that corresponds to Fig. 7 A and Fig. 7 C respectively.
Primary clustering symbol description in the accompanying drawing:
100: dynamic amplifier
120,220: differential amplifier
Q
121, Q
122, Q
221, Q
222, Q1～Q8: transistor
140: electric current is controlled device
240: the degeneration resistance circuit
320,340,520,540: amplifier circuit
400,500: amplifier with variable gain and high dynamic range
420: amplifier module
422: amplifier unit
440: control unit
460: circuit for regulating output current capacity
501: signal input end
502: current mirror
510: matching unit
530: the Dc bias buffer circuit
543: resistor blocks
550: bias circuit
570: resistor blocks
580: pre-segmenting unit
590: the unit transducer
620: analog/digital converter
640: digital/analog converter
660: subtracter
680: amplifier unit is selected circuit
C1, C2, C3, C4: capacitor
CS1, CS2: current source
R1, R2: main resistor
R3, R4: auxiliary resistor
SW1, SW2: activation switch
SW3: main switch
SW4: auxiliary switch
Embodiment
Amplifier with variable gain and high dynamic range of the present invention comprises an amplifier module, a control unit and a circuit for regulating output current capacity.Amplifier module is in order to amplify an input signal.Amplifier module comprises a plurality of amplifier units, and these a plurality of amplifier units are coupled in parallel, and the yield value of these a little amplifier units is different.Control unit is in order to according to a gain controlling signal, and a plurality of amplifier units of activation one of at least.At least one amplifier unit that is enabled be in order in response to input signal to export a current signal.Circuit for regulating output current capacity is in order to being received from the current signal of at least one amplifier unit output that is enabled, and under the control of control unit, regulates the size of current signal, to export an output signal accordingly.Each amplifier unit and circuit for regulating output current capacity are coupled in series.
For foregoing of the present invention can be become apparent, below especially exemplified by a preferred embodiment, and conjunction with figs. is described in detail below:
Please refer to Fig. 4, it shows the system block diagrams according to the amplifier with variable gain and high dynamic range of one embodiment of the invention.Amplifier with variable gain and high dynamic range 400 shown in Figure 4 comprises amplifier module 420, control unit 440 and circuit for regulating output current capacity 460.Amplifier module 420 is in order to amplify input signal Vi.Amplifier module 420 comprises a plurality of amplifier units 422.A plurality of amplifier unit 422 coupled in parallel, and the yield value of a plurality of amplifier unit 422 is different.Control unit 440 is in order to according to a plurality of amplifier units 422 of gain controlling signal VC activation one of at least.At least one amplifier unit 422 that is enabled be in order in response to input signal Vi to export a current signal Io.Circuit for regulating output current capacity 460 is in order to being received from the current signal Io of at least one amplifier unit of being enabled 422 outputs, and under the control of control unit 440, regulates the size of current signal Io, to export an output signal Out accordingly.Each amplifier unit 422 is a coupled in series with circuit for regulating output current capacity 460.Control unit 440 is controlled circuit for regulating output current capacity 460 according to gain controlling signal VC.
In present embodiment, by the amplifier unit 422 that uses a plurality of coupled in parallel, by control unit 440 under the control of gain controlling signal VC, select different amplifier units 422, can improve the scope of amplitude that allows the input signal Vi that output signal Out can distortion of amplifier 400, also can improve the dynamic range of amplifier 400.In addition, each amplifier unit 422 and circuit for regulating output current capacity 460 coupled in series of amplifier with variable gain and high dynamic range 400 of the present invention, make a circuit for regulating output current capacity 460 can be a plurality of amplifier unit 422 and share, therefore can simplify circuit effectively.So, present embodiment realize a high dynamic range put device greatly in, also can reach the simplification circuit, reduce the purpose of circuit unit to reduce cost.In present embodiment, circuit for regulating output current capacity 460 for example is to use electric current to control device to reach, so also be not limited thereto.
Please refer to Fig. 5, an example of the detailed circuit diagram of the amplifier with variable gain and high dynamic range of its displayed map 4.Amplifier module 420 comprises amplifier circuit 520 and 540 and one selected cell.Amplifier circuit 520 comprises one first differential amplifier, in order to amplify input signal Vi.Amplifier circuit 540 comprises a current source cell, one second differential amplifier and a resistor blocks 543.Second differential amplifier is in order to amplify input signal Vi, and second differential amplifier is coupled to current source cell, and resistor blocks 543 is coupled to second differential amplifier.Resistor blocks 543 comprises a plurality of main resistor R 1 and R2 and a plurality of main switch SW 3.Each main switch SW 3 is respectively at optionally conducting under the control of control unit 440, and main switch SW 3 usefulness of conducting are so that corresponding main resistor R 1 and R2 have current path.The yield value of second differential amplifier is relevant with the resistance value of main resistor R 1 with current path and R2.Selected cell is used under the control of control circuit 440, activation first differential amplifier and second differential amplifier the two one of, make first differential amplifier of activation and second differential amplifier the two one of output correspond to the current signal Io of input signal Vi.
Amplifier with variable gain and high dynamic range 500 also comprises a signal input end 501 and a matching unit 510.Signal input end 501 is in order to receive input signal Vi.When input signal Vi is the signal of single-ended input, be the signal of a radio frequency (Radio Frequency) for example, matching unit 510 converts the differential input signal Vd of both-end input in order to the input signal Vi with single-ended input, and makes input 510 and subordinate's circuit of matching unit 510 finish impedance matching.Matching unit 510 is that (Balance to Unbalance Transformer BALUN) reaches by single-ended commentaries on classics both-end transducer for example.First differential amplifier and second differential amplifier will be handled the differential input signal Vd that input signal Vi converts.
First differential amplifier of amplifier circuit 520 has transistor Q1 and transistor Q2.The base stage of transistor Q1 and Q2 is in order to receive differential input signal Vd, and the emitter-base bandgap grading of transistor Q1 and Q2 all is coupled to earthed voltage.The current source cell of amplifier circuit 540 comprises current source CS1 and CS2, and current source CS1 and CS2 are realized by current mirror 502.Second differential amplifier comprises transistor Q3 and Q4, and the base stage of the 3rd transistor Q3 and Q4 is in order to receive differential input signal Vd, and the emitter-base bandgap grading of transistor Q3 and Q4 is coupled to current source CS1 and CS2 respectively.The emitter-base bandgap grading of transistor Q3 also is coupled to a plurality of main resistor R 1, and the emitter-base bandgap grading of transistor Q4 also is coupled to a plurality of main resistor R 2.Each main resistor R 1 is to electrically connect by a main switch SW 3 and a main resistor R 2.The collection utmost point of transistor Q1 and Q2 is coupled to the collection utmost point of transistor Q3 and Q4 respectively, and the collection utmost point of transistor Q1 and Q2 is in order to output current signal Io.Above-mentioned selected cell for example comprises activation switch SW 1 and SW2, and activation switch SW 1 is electrically connected to the emitter-base bandgap grading of transistor Q1 and Q2, and 2 of activation switch SW are electrically connected to current mirror 502.The emitter-base bandgap grading of above-mentioned transistor Q1 and Q2 also can be coupled to a current source, and right present embodiment is that all to be coupled to earthed voltage be that example is done explanation to the emitter-base bandgap grading with transistor Q1 and Q2.
Amplifier with variable gain and high dynamic range 500 also comprises a direct current bias voltage buffer circuit 530 and a bias circuit 550.Dc bias buffer circuit 530 is coupled between signal input end 501 and the amplifier module 420, preferably is coupled between matching unit 510 and the amplifier module 420.Bias circuit 550 is in order to provide Dc bias to amplifier module 420.Dc bias buffer circuit 530 for example comprises four capacitor C1～C4.The other end that the end of four capacitor C1～C4 is coupled to 501, four capacitor C1～C4 of signal input end by matching unit 510 is coupled to the base stage of transistor Q1～Q4 respectively.Bias circuit 550 is in order to provide the base stage of Dc bias to transistor Q1～Q4.Capacitor C1～C4 is respectively in order to the voltage between the base stage of isolated transistor Q1 and Q2 and transistor Q3 and Q4.The Dc bias of the base stage of transistor Q1～Q4 is directly provided by bias circuit 550.
The mode of operation of amplifier with variable gain and high dynamic range 500 is described as follows.Control unit 440 is according to gain controlling signal VC, and output switch controlling signal CSW1 and CSW2 come control switch SW1 and SW2 respectively, with selective amplifier circuit 520 and 540 at least one of them.Gain controlling signal VC is provided by an external circuit, and when input signal Vi is big more, then gain controlling signal VC can be accordingly more little.If control unit 440 selective amplifier circuit 540, then control unit 440 is also exported a plurality of enable signals and is controlled main switch.Present embodiment is main resistor R 1 and R2 and three the main switch SW 3 that comprise three different resistance values with resistor blocks 543, and a plurality of enable signal MC1～MC3 of control unit 440 output control main switch SW 3 and do explanation for example.By the main switch SW of three of conductings 3 one of them, or two main switch SW of conducting simultaneously can allow resistor blocks 543 have various equivalent resistance more than 3.The resistor blocks 543 of different equivalent resistances can make amplifier circuit 540 equivalences become the amplifier unit 422 of a plurality of different gains of Fig. 4.
When the gain controlling signal VC that is received when control unit 440 changes along with the size of input signal Vi, for example, when the amplitude of input signal Vi became big, the voltage of gain controlling signal VC will diminish, and made control unit 440 select the less amplifier unit 422 of yield value.That is when being minimum amplitude as if input signal Vi, control unit 440 is with first conducting activation switch SW 1 and not conducting activation switch SW 2, with activation amplifier circuit 520 and disabled amplifier circuit 540.At this moment, the yield value of amplifier module 420 equals the yield value of amplifier circuit 520 in fact, and the yield value of amplifier module 420 is maximum, and the linearity be a minimum.When input signal Vi increased gradually, control unit 440 was with conducting activation switch SW 1 and not conducting activation switch SW 2, with disabled amplifier circuit 520 and activation amplifier circuit 540.And control unit 440 is according to the main switch SW 3 of gain controlling signal VC turning part, with the yield value of the amplifier circuit 540 that obtains corresponding to input signal Vi.At this moment, the yield value of amplifier module 420 is the yield value of amplifier circuit 540, and the yield value of amplifier module 420 is for diminishing, and it is big that the linearity becomes.So, when input signal Vi was maximum, resistor blocks 543 is controlled so as to had maximum equivalent resistance, so that the yield value minimum of amplifier circuit 540, linearity maximum.So, can be according to the scope design resistor blocks 543 of the amplitude size of input signal Vi, and can all can have corresponding yield value to amplify input signal Vi and undistorted in this scope, and reach the purpose that yield value that high dynamic range adjusts is adjusted.
In addition, Dc bias buffer circuit 530 has been isolated the voltage between the base stage of transistor Q1 and Q2 and transistor Q3 and Q4.So, when selecting unit switched amplifier circuit 520 and 540, because the base stage of transistor Q1 and Q2 and transistor Q3 and Q4 is kept fixing respectively, capacitor C1～C4 does not just need again through charge or discharge, amplifier circuit 520 and 540 just can reach quick switching, reduces the effect of the time of transient response.
Furthermore, amplifier with variable gain and high dynamic range 500 also can comprise a resistor blocks 570 again.Resistor blocks 570 comprises a plurality of auxiliary resistor R3, R4 and a plurality of auxiliary switch SW4.The base stage of transistor Q3 more is coupled to a plurality of auxiliary resistor R3, and the base stage of transistor Q4 also is coupled to a plurality of auxiliary resistor R4, and each auxiliary resistance device R3 electrically connects by an auxiliary switch SW4 and an auxiliary resistor R4.And control unit 440 is also exported a plurality of enable signals, for example is AC1, AC2 and AC3, controls a plurality of auxiliary switch SW4, so that resistor blocks 570 produces different equivalent resistances.Because the yield value of amplifier circuit 540 also can be subjected to the influence of base terminal resistance except the influence of the resistance that is subjected to the emitter-base bandgap grading end.Therefore,, can make that the changeable of amplifier circuit 540, the number of selectable yield value also are to increase, also can allow the yield value of amplifier circuit 540 do adjustment more subtly by using resistor blocks 570.
The amplifier circuit 520 of present embodiment and 540 is shared circuit for regulating output current capacity 460, to reach the saving circuit unit, the advantage that reduces cost.Circuit for regulating output current capacity 460 comprises transistor Q5～Q8, and the collection of transistor Q6 and Q7 extremely all is electrically connected to a supply voltage vcc.The emitter-base bandgap grading of transistor Q5 and Q6 all is electrically connected to the collection utmost point of transistor Q1, and the emitter-base bandgap grading of transistor Q7 and Q8 all is coupled to the collection utmost point of transistor Q2.The base stage of transistor Q5 is electrically connected to the base stage of transistor Q8, and the base stage of transistor Q6 is electrically connected to the base stage of transistor Q7, and the voltage of the base stage of transistor Q5 and Q6 is controlled by control unit 440.The collection utmost point of transistor Q5 and transistor Q8 is in order to output output signal Out.
Further, control unit 440 comprises a pre-segmenting unit 580 and a unit transducer 590.Pre-segmenting unit 580 is in order to receiving gain controlling signal VC, and according to the size of gain controlling signal VC, export a plurality of enable signal MC1～MC3, AC1～AC3, CSW1 and CSW2 accordingly, with difference at least one main switch SW 3 of conducting and at least one auxiliary switch SW4, and conducting activation switch SW 1 or SW2.Pre-segmenting unit 580 is also regulated controlling signal VCseg in order to produce a section according to gain controlling signal VC.Circuit for regulating output current capacity 460 is regulated the size that controlling signal VCseg regulates current signal Io according to section.When gain controlling signal VC increased or reduces along with the time is linear, section was regulated the waveform of controlling signal VCseg on time shaft and is essentially a sawtooth waveforms.Unit transducer 590 is to regulate the size of controlling signal VCseg in order to adjust section, to produce Current Control signal Vcs.Circuit for regulating output current capacity 460 is to regulate controlling signal VCseg according to adjusted section, that is Current Control signal Vcs, the size of regulating current signal Io.
The size of current of transistor Q5～Q8 is relevant to the exponential quantity of the cross-pressure between emitter-base bandgap grading with its base stage owing to flow through.Therefore, preferably, unit transducer 590 along with the section of time linear change is regulated controlling signal VCseg, converts magnitude of voltage the Current Control signal Vcs of the size of current that can change the transistor Q5～Q8 that flows through linearly to.
Please refer to Fig. 6, an example of the circuit diagram of pre-segmenting unit 580 in its displayed map 5.Pre-segmenting unit 580 comprises an analog/digital converter 620, a digital/analog converter 640 and a subtracter 660.Analog/digital converter 620 is a signal V1 VC number in order to conversion gain control news.Digital/analog converter 640 is a signal V2 in order to change the first signal V1.Subtracter 660 produces section and regulates controlling signal VCseg in order to after gain controlling signal VC is deducted the second signal V2.
Please refer to Fig. 6, pre-segmenting unit 580 can also comprise amplifier unit selection circuit 680, in order to size according to signal V1, export a plurality of enable signal MC1～MC3, AC1～AC3, CSW1 and CSW2 accordingly, with difference at least one main switch SW 3 of conducting and at least one auxiliary switch SW4, and conducting activation switch SW 1 or SW2.
Please be simultaneously with reference to Fig. 7 A-7D, the gain controlling signal VC of the pre-segmenting unit 580 of its displayed map 6 and section are regulated an example of the oscillogram of controlling signal VCseg.Please refer to Fig. 7 A and Fig. 7 C, when gain controlling signal VC increased or reduces along with the time is linear, section was regulated the waveform of controlling signal VCseg on time shaft and is essentially a sawtooth waveforms, shown in Fig. 7 B and Fig. 7 D.In Fig. 7 C and Fig. 7 D, be that to be divided into five sections be that example is done explanation section is regulated controlling signal VCseg.In these five sections, section is regulated controlling signal VCseg and respectively the amplifier unit 422 of five different gains values is controlled.Five section Seg1～Seg5 with Fig. 7 D are the example explanation.When the magnitude of voltage of gain controlling signal VC descends by maximum VC (max) is past, the pairing amplifier unit of section Seg1 422 is selected, and the value that section is regulated controlling signal VCseg also descends by VCseg (max) is past, make the electric current that flows through transistor Q5 and Q8 of circuit for regulating output current capacity 460, begin toward descending by maximum with the ratio R of output current Io.When the magnitude of voltage of gain controlling signal VC drops to VC (1), the pairing amplifier unit of section Seg2 422 is selected, and section is regulated the value of controlling signal VCseg still by the past decline of VCseg (max), make the electric current that flows through transistor Q5 and Q8 of circuit for regulating output current capacity 460, be still by maximum with the ratio R of output current Io and begin toward descending.Mode of operation in section Seg3～Seg5 is also similar.The advantage of such practice is, when switching different amplifier units 422 along with the size of gain controlling signal VC, circuit for regulating output current capacity 460 pairing ratio R begin to descend from maximum earlier, so, can make the amplifier with variable gain and high dynamic range 500 formed by circuit for regulating output current capacity 460 and amplifier module 420 the entire gain value maxgain value that can reach in the section thus begin to descend.So, can improve the variable scope of the entire gain value of amplifier with variable gain and high dynamic range 500, and improve the overall efficiency of amplifier 500.
In addition, in order to improve resistivity to noise, and the amplifier unit 422 that makes that is caused when avoiding system unstable produces too much change action, the waveform that the section of waveform that corresponds to the gain controlling signal VC of Fig. 7 A and Fig. 7 C is regulated controlling signal VCseg also can be designed to have sluggish tooth ripple, and it is respectively shown in Fig. 8 A and Fig. 8 B.Please be simultaneously with reference to Fig. 7 C and Fig. 8 B.So-called herein sluggishness is meant that the scope of two adjacent sections has part to overlap.Suppose that the pairing amplifier unit of present section Seg1 ' 422 is selected, when the magnitude of voltage of gain controlling signal VC continued to drop to VC (1), control unit 440 still can not selected different amplifier unit 422.After the magnitude of voltage of gain controlling signal VC continued to drop to VC ' (1), pairing amplifier unit 422 ability of section Seg2 ' were selected.Similarly, as the same during reverse operating.Suppose that the pairing amplifier unit of present section Seg2 ' 422 is selected.When the magnitude of voltage of gain controlling signal VC continued to rise to VC ' (1), control unit 440 still can not selected different amplifier unit 422.After the magnitude of voltage of gain controlling signal VC continued to rise to VC (1), pairing amplifier unit 422 ability of section Seg1 ' were selected.
In sum, though the present invention describes as above with an embodiment, so it is not in order to limit the present invention.Those skilled in the art under the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is as the criterion when the content that the claim scope that look application is defined.
Claims (11)
1. amplifier with variable gain and high dynamic range comprises:
One amplifier module, in order to amplify an input signal, this amplifier module comprises a plurality of amplifier units, and those amplifier units are coupled in parallel, and the yield value of those amplifier units is different;
One control unit, in order to according to a gain controlling signal, activation is one of those amplifier units at least, at least one this amplifier unit of this that is enabled in order in response to this input signal to export a current signal; And
One circuit for regulating output current capacity, in order to be received from this current signal of this this at least one amplifier unit output that is enabled, and under the control of this control unit, regulate the size of this current signal, to export an output signal accordingly, respectively this amplifier unit and this circuit for regulating output current capacity are coupled in series;
Wherein, this control unit is controlled this circuit for regulating output current capacity according to this gain controlling signal;
Wherein, this gain controlling signal is big or small corresponding with this input signal, and this control unit comprises:
One pre-segmenting unit, in order to receive this gain controlling signal, and according to the size of this gain controlling signal, export a plurality of enable signals accordingly, with those amplifier units of difference activation, this pre-segmenting unit is regulated controlling signal in order to produce a section according to this gain controlling signal, this circuit for regulating output current capacity is regulated the size that controlling signal is regulated this current signal according to this section, when this gain controlling signal increased or reduces along with the time is linear, this section was regulated the waveform of controlling signal on time shaft and is essentially a sawtooth waveforms.
2. amplifier with variable gain and high dynamic range as claimed in claim 1, wherein, this sawtooth waveforms is to have sluggish sawtooth waveforms.
3. amplifier with variable gain and high dynamic range as claimed in claim 1, wherein, this pre-segmenting unit comprises:
One analog/digital converter is one first signal in order to change this gain controlling signal;
One digital/analog converter is one second signal in order to change this first signal; And
One subtracter after this gain controlling signal is deducted this second signal, produces this section and regulates controlling signal.
4. amplifier with variable gain and high dynamic range as claimed in claim 1, wherein, this control unit comprises a unit transducer, regulate the size of controlling signal in order to adjust this section, this circuit for regulating output current capacity is regulated the size that controlling signal is regulated this current signal according to adjusted this section.
5. amplifier with variable gain and high dynamic range as claimed in claim 1, wherein, this amplifier module comprises:
One first amplifier circuit comprises one first differential amplifier, in order to amplify this input signal;
One second amplifier circuit comprises:
One current source cell;
One second differential amplifier, in order to amplify this input signal, this second differential amplifier is coupled to this current source cell; And
One first resistor blocks, be coupled to this second differential amplifier, this first resistor blocks comprises a plurality of main resistors and a plurality of main switch, respectively this main switch is respectively at optionally conducting under the control of this control unit, the main switch of this of conducting uses so that corresponding main resistor has current path, and the yield value of this second differential amplifier is relevant with the resistance value of the main resistor with current path; And
One selected cell, be used under the control of this control circuit, this first differential amplifier of activation and this second differential amplifier the two one of, make this first differential amplifier of activation and this second differential amplifier the two one of output correspond to this current signal of this input signal.
6. amplifier with variable gain and high dynamic range as claimed in claim 5, wherein, this first differential amplifier has a first transistor and a transistor seconds, the base stage of this first transistor and this transistor seconds is in order to receive this input signal, and the emitter-base bandgap grading of this first transistor and this transistor seconds all is coupled to earthed voltage;
Wherein, this current source cell comprises one first current source and one second current source, this second differential amplifier comprises one the 3rd transistor AND gate 1 the 4th transistor, those main resistors comprise a plurality of first main resistor and a plurality of second main resistor, the 3rd transistor AND gate the 4th transistorized base stage is in order to receive this input signal, the 3rd transistor AND gate the 4th transistorized emitter-base bandgap grading is coupled to this first current source and this second current source respectively, the 3rd transistorized emitter-base bandgap grading also is coupled to those first main resistors, the 4th transistorized emitter-base bandgap grading also is coupled to those second main resistors, and each first main resistor electrically connects by a main switch and this second main resistor;
Wherein, the collection utmost point of this first transistor and this transistor seconds is coupled to the 3rd transistor AND gate the 4th transistorized collection utmost point respectively, and the collection utmost point of this first transistor and this transistor seconds is in order to export this current signal.
7. amplifier with variable gain and high dynamic range as claimed in claim 6, wherein, comprise a signal input end, a direct current bias voltage buffer circuit and a bias circuit, this signal input end is in order to receive this input signal, this Dc bias buffer circuit is coupled between this signal input end and this amplifier module, and this bias circuit is in order to provide Dc bias to this amplifier module.
8. amplifier with variable gain and high dynamic range as claimed in claim 7, wherein, this Dc bias buffer circuit comprises four capacitors, one end of these four capacitors is coupled to this signal input end, the other end of these four capacitors is coupled to this first transistor, this transistor seconds, the 3rd transistor and the 4th transistorized base stage respectively, and this bias circuit is in order to provide Dc bias to this first transistor, this transistor seconds, the 3rd transistor and the 4th transistorized base stage.
9. amplifier with variable gain and high dynamic range as claimed in claim 6, wherein, this amplifier module comprises one second resistor blocks, comprise a plurality of first auxiliary resistors, a plurality of second auxiliary resistor and a plurality of auxiliary switch, the 3rd transistorized base stage also is coupled to those first auxiliary resistors, the 4th transistorized base stage also is coupled to those second auxiliary resistors, and each first auxiliary resistor electrically connects by an auxiliary switch and this second auxiliary resistor.
10. amplifier with variable gain and high dynamic range as claimed in claim 6, wherein, this circuit for regulating output current capacity comprises one the 5th transistor, one the 6th transistor, one the 7th transistor and one the 8th transistor, the 6th transistor and the 7th transistorized collection extremely all are electrically connected to a supply voltage, the 5th transistor and the 6th transistorized emitter-base bandgap grading all are electrically connected to the collection utmost point of this first transistor, the 7th transistor and the 8th transistorized emitter-base bandgap grading all are coupled to the collection utmost point of this transistor seconds, the 5th transistorized base stage is electrically connected to the 8th transistorized base stage, the 6th transistorized base stage is electrically connected to the 7th transistorized base stage, and the voltage of the 5th transistor and the 6th transistorized base stage is controlled by this control unit;
Wherein, the 5th transistor and the 8th transistorized collection utmost point are in order to export this output signal.
11. amplifier with variable gain and high dynamic range as claimed in claim 5, wherein, comprise a matching unit, when this input signal is the signal of single-ended input, this matching unit converts this input signal that produces the both-end input in order to this input signal with single-ended input, and this first differential amplifier and second differential amplifier are in order to amplify this input signal of both-end input.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710194392XA CN101471636B (en) | 2007-12-26 | 2007-12-26 | Amplifier with variable gain and high dynamic range |
| US12/101,311 US7688144B2 (en) | 2007-12-14 | 2008-04-11 | Variable-gain wide-dynamic-range amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710194392XA CN101471636B (en) | 2007-12-26 | 2007-12-26 | Amplifier with variable gain and high dynamic range |
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| Publication Number | Publication Date |
|---|---|
| CN101471636A CN101471636A (en) | 2009-07-01 |
| CN101471636B true CN101471636B (en) | 2011-11-23 |
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| CN200710194392XA Expired - Fee Related CN101471636B (en) | 2007-12-14 | 2007-12-26 | Amplifier with variable gain and high dynamic range |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101582060B1 (en) * | 2011-11-14 | 2015-12-31 | 인텔 코포레이션 | Macro-transistor devices |
| CN104065423B (en) * | 2013-03-18 | 2017-04-05 | 神讯电脑(昆山)有限公司 | Signal processing system and the signal processing method |
| CN104065394B (en) * | 2013-03-18 | 2017-04-05 | 神讯电脑(昆山)有限公司 | Path switching system and the path switching method |
| CN103389161A (en) * | 2013-07-30 | 2013-11-13 | 东莞理工学院 | Method and phase locking amplifier device for detecting terahertz weak signal |
| WO2019019058A1 (en) | 2017-07-26 | 2019-01-31 | 深圳市汇顶科技股份有限公司 | Dynamic amplifying circuit |
| CN109729758B (en) * | 2017-08-30 | 2023-05-26 | 深圳市汇顶科技股份有限公司 | Dynamic amplifying circuit |
| CN109756194B (en) * | 2017-11-07 | 2022-11-22 | 瑞昱半导体股份有限公司 | Amplifier circuit and related receiver |
| CN110113017B (en) * | 2018-02-01 | 2023-09-08 | 马维尔亚洲私人有限公司 | Variable gain amplifier device and power system |
| CN108418559B (en) * | 2018-02-07 | 2021-12-14 | 南京中感微电子有限公司 | Nonlinear compensation power amplifying circuit and polar coordinate transmitter |
| CN108449058B (en) * | 2018-02-07 | 2021-08-20 | 南京中感微电子有限公司 | Nonlinear compensation power amplifying circuit and polar coordinate transmitter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5256987A (en) * | 1990-06-22 | 1993-10-26 | Fujitsu Limited | Power amplifier device having a plurality of power amplifier units connected in parallel |
| CN1141788C (en) * | 2002-07-22 | 2004-03-10 | 清华大学 | Variable-gain amplifier |
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2007
- 2007-12-26 CN CN200710194392XA patent/CN101471636B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5256987A (en) * | 1990-06-22 | 1993-10-26 | Fujitsu Limited | Power amplifier device having a plurality of power amplifier units connected in parallel |
| CN1141788C (en) * | 2002-07-22 | 2004-03-10 | 清华大学 | Variable-gain amplifier |
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| CN101471636A (en) | 2009-07-01 |
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