CN102340282A - Amplifier with wide gain range - Google Patents

Amplifier with wide gain range Download PDF

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Publication number
CN102340282A
CN102340282A CN2010102335088A CN201010233508A CN102340282A CN 102340282 A CN102340282 A CN 102340282A CN 2010102335088 A CN2010102335088 A CN 2010102335088A CN 201010233508 A CN201010233508 A CN 201010233508A CN 102340282 A CN102340282 A CN 102340282A
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signal
gain
amplifier
logic state
adjusted
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CN2010102335088A
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CN102340282B (en
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邱盈中
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Novatek Microelectronics Corp
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Novatek Microelectronics Corp
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Abstract

The invention discloses an amplifier with a wide gain range, which comprises a signal conversion unit, a channel unit and a plurality of amplifiers, wherein the signal conversion unit outputs a plurality of regulation signals and a plurality of selection signals according to a received gain regulation signal; according to the amplitude of the gain regulation signal, one selection signal is determined to be in the first logic state, and other selection signals are determined to be in the second logic state; the channel unit is provided with a plurality of channels which are respectively controlled by the selection signals so as to conduct the channel under the first logic state; the amplifiers are connected in series; a plurality of output ends of the amplifiers are simultaneously and respectively output to a plurality of channels of the channel unit; and the amplifiers are respectively controlled by the regulation signals of the signal conversion unit.

Description

Amplifier with wide gain ranging
Technical field
The present invention relates to a kind of amplifier of wide gain ranging, particularly relate to a kind of amplifier with low noise wide gain ranging.
Background technology
Generally speaking, single signal amplifier, its yield value are a limited scope.Bigger if desired yield value reaches bigger signal magnification ratio, generally can be connected in series a plurality of amplifiers.Fig. 1 shows the configuration diagram of conventional variable gain amplifier.Consult Fig. 1, general conventional variable gain amplifier is to be serially connected by 60 in a plurality of amplifiers.Each amplifier 60 has gain ranging VGA1 respectively, VGA2 ..., VGN.This N variable gain amplifier receives gain-adjusted signal VC control to reach broad gain ranging.
The framework of Fig. 1, when operating in low gain, each amplifier 60 still all can be unlocked, and causes the too noisy when low gain.
The another kind of amplifier that can reach broad gain ranging is realized by on-off controller.Fig. 2 shows the configuration diagram of another kind of conventional variable gain amplifier.Consult Fig. 2, a plurality of amplifier 11-14 are serially connected by switch 21～28, and a signal input end 1 and a signal output end 2 are arranged.Also there be transmission line (through line) 31～34 parallelly connected between the switch with amplifier.By the control of control circuit 3, by the gain of connecting line 41～44 resonance-amplifiers by 51～54 pairs of switches 21～28 of connecting line.When the yield value that will operate when being lower than maxgain value, the several amplifiers that can only open the front get final product, and output signal is sent to output by transmission line 31～34.
Framework so, when for example only driving first order amplifier 11, signal can pass through the transmission line 32,33,34 of series connection etc., and the effect of derailing switch, therefore produces unnecessary loss, and then produces relatively poor noise figure.
In other words, though, when it operates in the low gain value, can cause noise ratio bigger owing to the connection of a plurality of amplifiers though wide variable gain value scope can combine by a plurality of amplifiers.The noise of traditional wide variable gain value amplifier during not to this low gain value done and further inquired into and solve.
Summary of the invention
The present invention provides a kind of amplifier with broad gain ranging, but has lower noise figure at least.
The present invention proposes a kind of amplifier with wide gain ranging, comprises a signal conversion unit, a channel unit and a plurality of amplifier.Signal conversion unit is exported a plurality of adjusting signals and a plurality of selection signal according to a gain-adjusted signal that is received.Size according to this gain-adjusted signal determines one of this selection signal to be in one first logic state, and other this selection signal is one second logic state.Channel unit has a plurality of passages controlled by this selection signal, is in this passage of this first logic state with conducting.Amplifier is cascaded.A plurality of outputs of a plurality of amplifiers all output to a plurality of passages of channel unit simultaneously respectively, and this amplifier is controlled by a plurality of adjusting signals of signal conversion unit respectively.
The present invention also provides a kind of gain adjusting method therefore with wide gain ranging, to form an amplifier.The method comprises according to a gain-adjusted signal that is received; Export a plurality of adjusting signals and a plurality of selection signal; Wherein the size according to this gain-adjusted signal determines one of this selection signal to be in one first logic state, and other this selection signal is one second logic state.In addition, the method also comprises the control that a plurality of passages receive this selection signal respectively is set, and is in this passage of this first logic state with conducting.A plurality of amplifiers are cascaded.One output of each amplifier all is connected respectively to this passage of this channel unit simultaneously, and each amplifier is controlled by the adjusting signal of this signal conversion unit respectively.
For making the above-mentioned feature and advantage of the present invention can be more obviously understandable, hereinafter is special lifts embodiment, and is described with reference to the accompanying drawings as follows.
Description of drawings
Fig. 1 shows the configuration diagram of conventional variable gain amplifier.
Fig. 2 shows the configuration diagram of another kind of conventional variable gain amplifier.
Fig. 3 shows according to one embodiment of the invention, has the circuit box sketch map of the amplifier of wide gain ranging.
Fig. 4 shows according to one embodiment of the invention, has the amplifier operation mechanism sketch map of wide gain ranging.
Fig. 5 shows according to one embodiment of the invention, the circuit diagram of signal conversion unit 100.
Fig. 6 shows according to one embodiment of the invention, the relation that actual gain value G and amplifier start.
Fig. 7 shows single variable gain amplifier gain and noise figure relation sketch map.
Fig. 8 shows according to one embodiment of the invention, and amplifier of the present invention is connected in series the comparison sketch map of Amplifier Gain and noise with traditional level Four.
Fig. 9 shows according to one embodiment of the invention, has the circuit box sketch map of the amplifier of wide gain ranging.
Figure 10 shows according to one embodiment of the invention, has the circuit box sketch map of the amplifier of wide gain ranging.
The reference numeral explanation
1: signal input end
2: signal output end
3: control circuit
11～14: amplifier
22～28: switch
31～34: transmission line
41～44: connecting line
51～54: connecting line
60: amplifier
100: signal conversion unit
102: variable gain amplifier
104: channel unit
110a～110n: passage
120: selected cell
120_1～120_N: comparator
122: signal converter
200a～200d: amplifier
300～306: amplifier
Embodiment
The amplifier of wide gain ranging can be applied on the multiple electronic product, and for example for receiver, the low noise variable gain amplifier is very important element.General conventional variable gain amplifier is in order to provide broad gain ranging, just often when gain is maximum, have relatively low noise figure.But, also need preferable noise figure at other gain ranging along with the demand of the system specification.The present invention can and provide than low noise figure to broad gain ranging at least.
Below lift some embodiment the present invention is described, but the present invention is not limited only to the embodiment that lifted.In addition, also can suitably combine between the embodiment that is lifted.
Fig. 3 shows according to one embodiment of the invention, has the circuit box sketch map of the amplifier of wide gain ranging.Consult Fig. 3, the amplifier with wide gain ranging comprises a signal conversion unit 100, a plurality of variable gain amplifier (variable-gain amplifier, VGA) 102, and a channel unit 104.
Signal conversion unit 100; For example be to electric pressure converter (voltage to voltage converter with voltage; VVC) or electric current to current converter (current to current converter; IIC) explain for example, however the gain-adjusted signal that the transducer that also can be voltage to current converter or electric current to electric pressure converter or other kenels receives with conversion.In present embodiment, signal conversion unit 100 is exported a plurality of adjusting signal VC1 according to a gain-adjusted signal VC who is received, VC2 ..., VCN and a plurality of selection signal Vcx1, Vcx2, Vcx3 ..., VcxN.Select signal Vcx1, Vcx2, Vcx3 ..., VcxN be that one of them that select signal according to the size decision of gain-adjusted signal VC is in one first logic state, and other selection signal is one second logic state.In other words, pairing passage in the selection signal meeting channel unit 104 that conducting connected of first logic state, the selection signal of second logic state is then closed pairing passage.
Channel unit 104 has a plurality of passages to be selected signal to control respectively, is in this passage of this first logic state with conducting.Channel unit 104 for example is multi-channel switch unit or multichannel multiplexer, or the circuit of reciprocity function.Channel unit 104 according to the control of selecting signal selecting wherein desired passage, its this passage conducting and output signal (output).
Fig. 4 shows according to one embodiment of the invention, has the amplifier operation mechanism sketch map of wide gain ranging.Consult Fig. 4, dotted line is represented a plurality of passage 110a, 110b, and 110c ..., 110n.Also consulting Fig. 3, is can conductive channel 110a during in first logic state when selecting signal Vcx1, other passage 110b, and 110c ..., 110n is selected signal Vcx2, Vcx3 ..., being controlled to be of VcxN closed.When operated yield value only need be opened two amplifiers and gets final product, can select conductive channel 110b, and other pathway closures.The rest may be inferred, can select one of them desired passage to be opened.
Variable gain amplifier 102 is denoted as Amp1, Amp2 ..., AmpN is cascaded.A plurality of outputs of variable gain amplifier all output to a plurality of passages of channel unit 104 simultaneously respectively, and this variable gain amplifier is controlled by a plurality of adjusting signal VC1～VCN of signal conversion unit 100 respectively.Wherein, the magnitude relationship of VC, VC1, VC2.....VCN can be for VC=VC1=VC2......=VCN or is not all equated, for example VC ≠ VC1 ≠ VC2...... ≠ VCN.Wherein VC1 is gain-controlled voltage or the electric current of Amp1, and VC2 is gain-controlled voltage or the electric current of Amp2, and VCN is gain-controlled voltage or the electric current of AmpN.
Further specify the operation mechanism of signal conversion unit 100.Fig. 5 shows according to one embodiment of the invention, the circuit diagram of signal conversion unit 100.Consult Fig. 5, signal conversion unit 100 for example comprises a selected cell 120 and a signal converter 122.
Selected cell 120 for example comprises a plurality of comparator 120_1～102_N, receives a plurality of reference signal Vref 1 of a plurality of passages in the respective channel unit 104, and Vref 2 ..., Vref etc., also receiving gain is regulated signal VC simultaneously.Gain-adjusted signal VC and this reference signal compare, but decision is this first logic state than the pairing selection signal of the little immediate reference news of gain-adjusted signal VC, and other this selection signal is this second logic state.But the mode that Fig. 5 lifted only is one of them embodiment of mode, under reciprocity function, also different designs can be arranged.
Signal Vcx1, Vcx2 ... with Vcxn be the switching circuit controlling signal.For example, when VC＞Vref1, the signal passage is that 110a and switching circuit 1 are opened other switching circuits and closed.Output (output) output gain scope is to be provided by Amp1.With should VC＞during Vref2, the signal passage is 110b, and switching circuit 2 opens, switching circuit 1 cuts out with other switching circuits.Output output gain scope is to be provided by Amp1 and Amp2.When VC＞VrefN, output output gain scope is provided by Amp1, Amp2...... and AmpN by that analogy.
Reference signal Vref 1～VrefN for example is gradually big in regular turn, can determine that so approaching passage is switched on.
In addition, the signal converter 122 of signal conversion unit 100 is in order to gain-adjusted signal VC is converted to the individual signal VC1～VCN that else regulates, with difference resonance-amplifier 102.It is as shown in Figure 6 to utilize this framework can be combined into broad gain ranging.Fig. 6 shows according to one embodiment of the invention, the relation that actual gain value G and amplifier start.When actual gain value G was not more than VGA2, it was provided by the yield value VGA1 that Amp1 provided.Horizontal dotted line is represented the corresponding amplifier of the required startup of respective operations yield value G.The present invention need not pass through unnecessary switching circuit and can directly export, to improve gain and to reduce noise figure.
With regard to framework of the present invention, selected to lead to and can see through channel unit 104 independent outputs.When therefore operating in low gain range, noise ratio can effectively reduce.
Below further specify the present invention and reach the authenticate that reduces between the noise.Consider and can be observed by formula 1 for low noise, when the too much variable gain amplifier of serial connection, its relative noise index can become big.
( 1 ) F = F 1 + F 2 - 1 G 1 + F 3 - 1 G 1 × G 2 + . . . . . . . . + F n - 1 G 1 × G 2 × . . . × Gn - 1
Fn represents the noise figure of n amplifier, and Gn is other yield value.When the more amplifier of serial connection, then can bigger again noise.
In addition, Fig. 7 shows single variable gain amplifier gain and noise figure relation sketch map.Consult Fig. 7, solid line is operated yield value, and dotted line is the noise of corresponding yield value.As far as single variable gain amplifier, its yield value for example is when 9dB, and the relative noise index is 13dB.If with tradition serial connection mode, as shown in Figure 1, suppose that each grade amplifier provides 3dB to reach the yield value of 9dB by 3 grades (3-stage) serial connection, then relative noise figure then adds that for 13dB it is 20dB that back two-stage noise reaches noise.Hence one can see that, gets over for a long time when serial connection progression, and resulting noise figure is high relatively when gaining than hang down.If gain obtain better noise figure when low, then gain ranging diminishes relatively.
On the other hand, output of the present invention only needs a switching circuit, and therefore level noise figure that switching circuit is contributed in back just diminishes relatively.For example: when VC＞Vref1, the signal passage is that passage 110a and switching circuit 1 are opened other switching circuits and closed.Output institute output gain scope is provided by Amp1.And its corresponding noise figure is a switching noise index for SF2.
Fig. 8 shows according to one embodiment of the invention, and amplifier of the present invention is connected in series the comparison sketch map of Amplifier Gain and noise with traditional level Four.Consult Fig. 8, solid line is the relation of gain of the present invention and noise, and dotted line is the relation of traditional level Four serial connection Amplifier Gain and noise.The Amplifier Gain scope of each grade is 9B.Data by checking can find out, the present invention can improve when operating in gain and hang down, and can obtain lower noise figure.
Based on the design concept of Fig. 3, each grade amplifier can have different combinations again.Fig. 9 shows according to one embodiment of the invention, has the circuit box sketch map of the amplifier of wide gain ranging.Consult Fig. 9, its circuit framework is similar with Fig. 3, wherein only does explanation with regard to the variation of amplifier.The amplifier of each grade for example can have a plurality of secondary amplifier to make up.Present embodiment is that example is to form single level amplifier with two secondary amplifiers.First order amplifier for example is made up of two amplifier 200a serial connections.Second level amplifier for example is made up of two amplifier 200b serial connections.Third level amplifier for example is made up of two amplifier 200c serial connections.The rest may be inferred, and the afterbody amplifier for example is made up of two amplifier 200d serial connections.
In addition, the Amplifier Gain value scope of each grade also need not be all identical.Figure 10 shows according to one embodiment of the invention, has the circuit box sketch map of the amplifier of wide gain ranging.Consult Figure 10, its circuit framework is similar with Fig. 3, wherein only does explanation with regard to the variation of amplifier.The amplifier 300,302,304 of each grade ..., indivedual gain rangings of 306 can need not all identical, and it for example is all inequality, is again or only that part is identical, and it changes according to actual design, but adding framework basically still keeps.Signal conversion unit 100 is still kept with the operation mechanism of channel unit 104.
Though the present invention discloses as above with embodiment; Right its is not in order to limit the present invention; Those skilled in the art can do some changes and retouching under the premise without departing from the spirit and scope of the present invention, so protection scope of the present invention is as the criterion with claim of the present invention.

Claims (10)

1. amplifier with wide gain ranging comprises:
One signal conversion unit; According to a gain-adjusted signal that is received; Export a plurality of adjusting signals and a plurality of selection signal, wherein the size according to this gain-adjusted signal determines one of this selection signal to be in one first logic state, and other this selection signal is one second logic state;
One channel unit has a plurality of passages controlled by this selection signal, with conducting to should first logic state selecting this passage of signal;
A plurality of amplifiers are cascaded, and wherein a plurality of outputs of this amplifier all output to this passage of this channel unit simultaneously respectively, and this amplifier is controlled by this adjusting signal of this signal conversion unit respectively.
2. the amplifier with wide gain ranging as claimed in claim 1, wherein this channel unit is the multi-channel switch unit, or the multichannel multiplexer.
3. the amplifier with wide gain ranging as claimed in claim 1, wherein this signal conversion unit comprise a voltage to electric pressure converter or an electric current to current converter, to convert this gain-adjusted signal to this adjusting signal.
4. the amplifier with wide gain ranging as claimed in claim 1; Wherein this signal conversion unit comprises that a selected cell receives a plurality of reference signal that should passage; Also receive this gain-adjusted signal simultaneously; Wherein this gain-adjusted signal and this reference signal should the selection signal be this first logic state but determine more pairing than little immediate this reference signal of this gain-adjusted signal, and other this selection signal be this second logic state relatively.
5. the amplifier with wide gain ranging as claimed in claim 4, wherein this reference signal of this comparing unit is gradually big in regular turn.
6. the amplifier with wide gain ranging as claimed in claim 4, wherein this signal conversion unit comprises a signal converter, to convert this gain-adjusted signal to this adjusting signal.
7. the amplifier with wide gain ranging as claimed in claim 1, wherein this adjusting signal and this gain-adjusted signal are unequal.
8. the amplifier with wide gain ranging as claimed in claim 1, wherein at least one of this amplifier is by a plurality of secondary amplifiers serial connections.
9. the gain adjusting method therefore with wide gain ranging is used for amplifier, comprising:
According to a gain-adjusted signal that is received; Export a plurality of adjusting signals and a plurality of selection signal; Wherein the size according to this gain-adjusted signal determines one of this selection signal to be in one first logic state, and other this selection signal is one second logic state;
The control that a plurality of passages receive this selection signal respectively is set, with conducting to should first logic state selecting this passage of signal; And
A plurality of amplifiers are cascaded, and wherein an output of each this amplifier all is connected respectively to this passage of this channel unit simultaneously, and each this amplifier is controlled by this adjusting signal of this signal conversion unit respectively.
10. the gain adjusting method therefore with wide gain ranging as claimed in claim 9 wherein comprises according to this gain-adjusted signal this adjusting signal of output that is received and this step of this selection signal:
Convert this gain-adjusted signal to this adjusting signal;
Receive a plurality of reference signal and this gain-adjusted signal; And
Relatively this gain-adjusted signal and this reference signal should the selection signal be this first logic state but determine more pairing than little immediate these reference news of this gain-adjusted signal, and other this selection signal be this second logic state.
CN201010233508.8A 2010-07-19 2010-07-19 Amplifier with wide gain range Active CN102340282B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106441504A (en) * 2016-11-09 2017-02-22 珠江水利委员会珠江水利科学研究院 Linear frequency modulation continuous wave radar water level telemeasuring device and method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1759556A (en) * 2002-12-23 2006-04-12 英特尔公司 Weighted multi-input variable gain amplifier
CN101453596A (en) * 2007-11-29 2009-06-10 天钰科技股份有限公司 Automatic gain control circuit
US7786918B2 (en) * 2007-12-19 2010-08-31 Seiko Epson Corporation A/D conversion circuit and electronic instrument

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1759556A (en) * 2002-12-23 2006-04-12 英特尔公司 Weighted multi-input variable gain amplifier
CN101453596A (en) * 2007-11-29 2009-06-10 天钰科技股份有限公司 Automatic gain control circuit
US7786918B2 (en) * 2007-12-19 2010-08-31 Seiko Epson Corporation A/D conversion circuit and electronic instrument

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106441504A (en) * 2016-11-09 2017-02-22 珠江水利委员会珠江水利科学研究院 Linear frequency modulation continuous wave radar water level telemeasuring device and method
CN106441504B (en) * 2016-11-09 2018-10-09 珠江水利委员会珠江水利科学研究院 A kind of Modulation Continuous Wave Radar water level telemetering device and method

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