CN101335501A - Current signal linear transmitting method - Google Patents
Current signal linear transmitting method Download PDFInfo
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- CN101335501A CN101335501A CNA2007101277577A CN200710127757A CN101335501A CN 101335501 A CN101335501 A CN 101335501A CN A2007101277577 A CNA2007101277577 A CN A2007101277577A CN 200710127757 A CN200710127757 A CN 200710127757A CN 101335501 A CN101335501 A CN 101335501A
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Abstract
The invention discloses a method for realizing linear transmission of a current signal. The method utilizes the ingenious combination of a field effect tube common gate circuit and a constant current source circuit to transmit an input current signal from an input terminal to an output terminal without distortion and realize linear switch of voltage-current. The method is mainly applied to an amplifying circuit of the audio signal and can be used in other equipment which needs a precisely transmitted (amplified) electric signal. A loop negative feedback is not necessarily imposed for the electric signal amplifier constructed by applying the invention, and the electric signal amplifier can be applied to all amplifying circuits from a signal source to a power output, can conveniently regulate the circuit gain for realizing sound volume control and does not need to attenuate the signal, thus realizing high signal-to-noise output and being the best proposal for an analog amplifying circuit.
Description
Affiliated technical field
The present invention relates to a kind of method that realizes the current signal linear transmission, belong to the basic electronic circuit of electricity field.
Background technology
Analog electrical signal can be divided into voltage signal and current signal, present stage, signal of telecommunication transmission between stereo set is in the voltage transmission mode, and the size of current of current delivery mode, impedance, connector etc. also do not form unified standard, only in the complete sets of products of only a few manufacturer application are arranged.The current delivery mode is more and more in the device interior circuit application, and this will have benefited from current delivery mode advantage technically.Current delivery requires load impedance the smaller the better, also just is not afraid of the output short circuit certainly; Can improve antijamming capability with the current signal transmission between the equipment, and reduce the connector contact resistance and transmit of the influence of loop distribution parameter the signal transmission; Use the current signal transmission except that above-mentioned advantage at the device interior circuit, also regulating circuit gains and controls volume easily, does not need deamplification, realizes high s/n ratio output.The current delivery mode will be a developing direction from now on.
The invention of loop negative-feedback technology in simulation signal generator (tape, the disc etc.) epoch before digital tone source occurs, has been played important effect (also relevant with scientific and technological level with device level at that time) to improving amplifier performance.But along with the appearance of digital tone source (CD, DVD, SACD etc.), though index is more and more higher, people find, and are not likely interesting to listen to like that.Tracing it to its cause, is not that digital tone source is bad, and the problem still exists crystal amplifier itself in order to reduce nonlinear distortion, has applied the negative feedback of degree of depth loop, causes serious transient intermodulation, and this distortion is a hard distortion, and sense of hearing is had the greatest impact.And this distortion of discharge-tube amplifier is soft distortion, and discharge-tube amplifier even-order harmonic (distortion) has the effect of " beautifying " sound in addition, and almost Jue Ji discharge-tube amplifier has shone " life " again, says that from the angle of technology this is to fall back.Crystal amplifier will fully phase out the loop negative feedback, and nonlinear distortion is the obstacle of keeping off in front.The development of activated amplifier spare linear unit also do not occur so far, the nonlinear distortion of erase amplifier, must start with from circuit design.The one, make the parameter of transmission (amplification) signal and activated amplifier spare irrelevant, this is the most thorough, effective method; The 2nd, the non-linear of activated amplifier spare compensated, can be divided into opposite sex compensation and same sex compensation, widely used current mirroring circuit is exactly typical case's representative of same sex compensation.The accurate pairing that the method for compensation will rely on transistor parameter comes the guaranteed performance index, and the current mirroring circuit of a pair of excellent performance needs 4-5 that transistor is constituted, and at least will be to V
BE, the pairing of two parameters of β, increased manufacturing cost, be unfavorable for producing in batches.Moreover pairing always has error, and Here it is, and many amplifying circuits have used current mirroring circuit still will apply the degenerative reason of loop.Negative-feedback technology can improve distortion, but can not eliminate distortion, realizes that the target of zero distortion amplification can not be placed hope on negative-feedback technology, fully phases out the degenerative adjustable gain of loop zero distortion measurement, is the ultimate aim of modern transistor analogue amplifier.
Summary of the invention
In order to eliminate the nonlinear distortion of electric signal amplifier, make up the target of loop free negative feedback adjustable gain zero distortion measurement, the invention provides a kind of method that realizes the current signal linear transmission.The parameter of device is irrelevant in the transmission of this method enforcement current signal and the circuit, thereby can overcome the non-linear of activated amplifier spare, realizes the zero distortion transmission of current signal.Good when the pairing of input stage field effect transistor, at voltage signal and resistance of current signal input string, also can convert voltage signal to current signal, realize linear V/I conversion.Output current is carried out the I/V conversion by a potentiometer (being connected into the variable resistor form), i.e. adjustable circuit gain.
The present invention eliminates the technical scheme that nonlinear distortion adopts: the common gate complementary push-pull circuit received current signal that utilizes low input impedance, through current source loads separately, export the synthetic output of second level common gate complementary push-pull circuit to, it is set bias supply and is formed by two common gate complementary push-pull circuit and two constant-current source circuits and operating current, voltage.Its circuit connecting relation: Q
1, Q
2Source electrode meet R respectively
N, R
PAn end, R
N, R
PThe other end input (1) that is connected, Q
1, Q
2Grid meet V respectively
G-Negative terminal and V
G+Anode, V
G-Anode and V
G+The negative terminal ground connection (4) that links to each other, Q
1Drain electrode and Q
3The source electrode constant-current source I that is connected
S+Output (3), Q
2Drain electrode and Q
4The source electrode constant-current source I that is connected
S-Output (2), Q
3, Q
4Grid meet V respectively
O+Negative terminal and V
O-Anode, Q
3, Q
4The drain electrode output (6) that is connected, I
S+Input and V
O+The anode positive supply (5) that is connected, I
S-Input and V
O-The negative terminal negative supply (7) that is connected.
R
N, R
p, V
G-, V
G+Constitute voltage divider formula autobias circuit, determine Q
1, Q
2Static working current, I
S+, I
S-Determine Q
3, Q
4Static working current (be I
S+, I
S-Deduct Q
1, Q
2Static working current), V
O+, V
O-Determine Q respectively
1, I
S+, Q
3And Q
2, I
S-, Q
4Operating voltage.
In the time only need carrying out the current signal transmission, can cancel V
G-And V
G+, Q
1, Q
2The grid ground connection (4) that directly links to each other, by R
N, R
pSet up automatic bias and determine static working current.Advantage is that biasing circuit is very simple, and shortcoming is that input resistance is bigger, also can accomplish<100 Ω, can satisfy the requirement of current source to load impedance substantially.
In the time will taking into account the voltage signal input, must cancellation R
NAnd R
p(because at R
NAnd R
pOn to set up desirable voltage source character bias voltage very difficult), Q
1, Q
2The source electrode input (1) that directly is connected, by V
G-, V
G+Fixed condenser is determined static working current.Need only be to Q
1, Q
2Carry out good pairing, at voltage signal and resistance of current signal input string, just can be with the current signal that converts to of voltage signal linearity.
The present invention realizes the basic principle of current signal zero distortion transmission, it is the voltage-controlled characteristic of utilizing fieldtron, no grid current produces (grid current can be ignored fully for technotron input resistance>100M Ω, insulating gate type field effect tube input resistance>100000M Ω).Fig. 1 is the basic principle circuit, according to electrotechnical Kirchhoff's current law (KCL) (KCL), has for node (1):
-i
i-i
DN-i
DP=0
i
i=-(i
DN+i
DP) ………………[1]
Have for node (3):
i
DN+i
O+-I
S+=0
i
O+=I
S+-i
DN ………………[2]
Have for node (2):
i
DP+i
O-+I
S-=0
i
O-=-I
S--i
DP ………………[3]
Have for node (6):
i
O-i
O+-i
O-=0
i
O=i
O++i
O-
[2], [3] formula substitution following formula are got:
i
O=I
S+-i
DN-I
S--i
DP
Set I
S+=I
S-, have this moment:
i
O=-(i
DN+i
DP) ………………[4]
According to [1], [4] Shi Kede:
i
O=i
i ………………[5]
Can realize the zero distortion transmission of current signal, and irrelevant with the parameter of field effect transistor.
The maximum current that circuit can transmit is the I of technotron
DSS, in the time can not meeting the demands, but the multitube parallel use can reduce input resistance simultaneously.At present, technotron withstand voltage lower, when supply voltage when higher (for example being used for power amplifier), Q
1, Q
2, Q
3, Q
4Can use power field effect pipe in the insulated-gate type, Q
1, Q
2Relatively low to requirement of withstand voltage, also can use technotron, the voltage stabilizing didoe that only seals in appropriate voltage between its drain electrode and node [3], [2] gets final product; Q
1, Q
2, Q
3, Q
4Also can use the bipolar transistor triode, need only carry out the β pairing, and select those β to change the model of little (being the β good linearity) with operating current four pipes.Output current
Current gain slightly descends, because the linear problem of pairing precision and β though can not accomplish the zero distortion transmission of current signal, is not suitable for the V/I conversion very much yet, its performance can satisfy general requirement.
To constant-current source I
S+, I
S-Basic demand be output internal resistance big, to V
G-, V
G+, V
O+,, V
O-Basic demand be that voltage is stable, as long as meet the demands, available any components and parts constitute by any way.
Can add zero-bit in case of necessity and how obey circuit, in order to control null offset, Fig. 2 is a practical circuit.
Work as υ
DSWhen constant, the transfer characteristic of technotron:
In Fig. 3-1 circuit, V
G-, V
G+Be bias voltage, determine two pipe static working current, generally get V
G-=V
G+=V
G=0.5V
P, this moment static working current i
DO=0.25I
DSS, suppose N raceway groove Q
1With P raceway groove Q
2Parameter identical (promptly pairing is used fully).
For N raceway groove Q
1, V
PBe negative value, I
DSSBe on the occasion of, υ
GS=-V
G+Δ υ
GS, [7] formula can be write as:
For P raceway groove Q
2, V
PBe on the occasion of, I
DSSBe negative value, υ
GS=V
G+Δ υ
GS, [7] formula can be write as:
[8] formula launched:
[9] formula launched:
For node (1), (KCL) has according to electrotechnical Kirchhoff's current law (KCL):
-i
i-i
DN-i
DP=0
i
i=-(i
DN+i
DP)
[10], [11] formula substitution following formula are got:
Order
Be exactly in fact Q
1, Q
2Mutual conductance (also claiming mutual conductance) after complementary synthesizing, I
DSS, V
P, V
GAll be constant, so g
MIt also is constant.[12] formula can be write as:
i
i=-g
MΔυ
GS ………………[13]
[13] formula is for i
DWith υ
GSThe complementary push-pull circuit that all types field effect transistor that changes by square law constitutes is all set up, and belongs to the non-linear different in nature compensation method that compensates to activated amplifier spare.
Fig. 3-2 has explained this pass line very intuitively.
Input voltage: υ
i=Ri
i-Δ υ
GS
Δυ
GS=Ri
i-υ
i
Substitution [13] formula gets:
i
i=-g
MRi
i+g
Mυ
i
Can reach a conclusion from [14] formula: work as Q
1, Q
2When matching fully, g
MBe constant,, just the current signal that converts to of voltage signal linearity can be realized linear V/I conversion at voltage signal and resistance of current signal input string.
If consider υ
DSVariation, the transfer characteristic of technotron:
In the formula: V
P-pinch-off voltage, V
AThe sharp voltage of-ell
Work as υ
DSWhen changing with input signal, g
MNo longer be constant, the conclusion of front will be false.Therefore, during design circuit, make υ as far as possible
DSVery little with input signal variation or variation.In Fig. 1 circuit, current input terminal (1) changes maximum with input current and is ± 0.5V
P(present high transconductance technotron V
P<0.5 volt), itself changes not quite, adds Q
3, Q
4υ
GSAs long as the compensating action that changes is supply voltage and V
O-, V
O+Stable, Q
1, Q
2υ
DSSubstantially change the ingenious part of Here it is circuit structure of the present invention with input signal.
The beneficial effect that the present invention brings is, electric signal amplifier by its structure, there is no need to apply again the loop negative feedback, can be applicable to all amplifying circuits of the output from signal source to power, and regulating circuit gain easily realizes volume control, do not need deamplification, thereby realize high s/n ratio output, stride forward major step to the ultimate aim of the degenerative adjustable gain of loop free zero distortion measurement.
Description of drawings
Fig. 1 is the basic principle circuit diagram of the method for the current signal linear transmission that the present invention relates to.
Fig. 2 is an example with the current signal transmission circuit of a kind of V/I of taking into account conversion of the present invention's structure.
Fig. 3-the 1st is used for the connection layout of V/I conversion.
Fig. 3-the 2nd, the transfer characteristic curve figure of V/I conversion.
Fig. 4 is that the current signal transmission circuit that the present invention makes up is used for source of sound scheme schematic diagram partly.
Fig. 5 is that the current signal transmission circuit that the present invention makes up is used for power amplifier scheme schematic diagram partly.
Embodiment
The present invention is to provide a kind of method that realizes the current signal linear transmission, according to different purposes and requirement, the concrete application circuit of formation is diversified.Fig. 2 only is one of the most representative application circuit of making up of the method for the current signal linear transmission that the present invention relates to, it can take into account the voltage signal input, at voltage signal and current signal input (1) string one resistance (referring to Fig. 3-1), the voltage signal linear transformation can be become current signal, realize linear V/I conversion, and added the zero-bit servo circuit, have purposes widely.
In Fig. 2, D
1, T
3, R
3And D
2, T
4, R
4For constant-current source provides reference voltage and temperature-compensating, C
3, C
5And C
4, C
6Be filter capacitor, make reference voltage more stable.R
1, T
1And R
2, T
2Constant-current source I in difference pie graph 1 circuit
S+And I
S-, R
11, T
5And R
12, T
6The constant-current source output current that constitutes is at R
9, R
10, R
7, R
8, W
1, W
2The stable voltage of last generation passes through R
5, C
1And R
6, C
2Further filtering, the bias voltage V in pie graph 1 circuit
G-And V
G+Pass through R
14, C
7And R
13, C
8Further be filtered into Q
5, Q
6Bias voltage is provided.W
1Be used to adjust input (1) zero-bit, W
2Be used to adjust output (6) zero-bit.R
15, R
16For the zero-bit feedback resistance, pass through C
7, C
8The filtered signal electric current, control Q
5, Q
6Make output (6) zero-bit stable.Pass through R
17, R
18, R
19To power supply ± V
DDividing potential drop is at R
17, R
19Last generation voltage is through C
9, C
10Further filtering, the V in pie graph 1 circuit
O+, V
O-Be Q
1, Q
2, T
1, T
2, Q
3, Q
4Determine operating voltage.
This circuit should use the stabilized voltage power supply power supply, to guarantee Q
1, Q
2υ
DSSubstantially constant when work, when input voltage signal, can carry out linear V/I conversion.
In the embodiment shown in fig. 4, be with the schematic diagram of Fig. 2 circuit application in the source of sound part.Source of sound is to use CD, DVD, SACD machine and the computer sound card etc. of current-output type digital to analog converter (DAC), (electric current does not amplify through Fig. 2 circuit transmission with the DAC output current, just improve the ability that drives load, the DAC operating voltage has only ± and 5 volts, inside also is provided with the diode slicer, and carrying load ability is very poor, and it is very low to be directly used in the signal voltage that the I/V conversion obtains, not reaching output requires), one side is output current signal directly; Carry out the I/V conversion by R on the other hand, again through buffer circuit (voltage follower) output voltage signal.
In the embodiment shown in fig. 5, be that directly the received current signal also can receive voltage signal with the schematic diagram of Fig. 2 circuit application in power amplifier part, the input stage linear transformation by R and Fig. 2 circuit becomes current signal.The output current of Fig. 2 circuit carries out the I/V conversion through the telecommunications device W that is connected into the variable resistor form, promotes loud speaker or earphone sounding through output stage (voltage follow formula electric current amplifying stage), and W is used for volume control.
Claims (5)
1. the method for current signal linear transmission, it is set bias supply by two common gate complementary push-pull circuit and two constant-current source circuits and operating current, voltage and forms, and it is characterized in that: Q
1, Q
2Source electrode meet R respectively
N, R
PAn end, R
N, R
PThe other end input (1) that is connected, Q
1, Q
2Grid meet V respectively
G-Negative terminal and V
G+Anode, V
G-Anode and V
G+The negative terminal ground connection (4) that links to each other, Q
1Drain electrode and Q
3The source electrode constant-current source I that is connected
S+Output (3), Q
2Drain electrode and Q
4The source electrode constant-current source I that is connected
S-Output (2), Q
3, Q
4Grid meet V respectively
O+Negative terminal and V
O-Anode, Q
3, Q
4The drain electrode output (6) that is connected, I
S+Input and V
O+The anode positive supply (5) that is connected, I
S-Input and V
O-The negative terminal negative supply (7) that is connected.
2. according to the method for claim 1 described current signal linear transmission, it is characterized in that: get R
N=R
P=0, Q
1, Q
2The source electrode input (1) that directly is connected.
3. according to the method for claim 1 described current signal linear transmission, it is characterized in that: get V
G-=V
G+=0, Q
1, Q
2The grid ground connection (4) that directly links to each other.
4. according to the method for claim 1 described current signal linear transmission, it is characterized in that: Q
1, Q
2, Q
3, Q
4The field effect transistor of available any kind or bipolar transistor triode, and can many parallel connection be used.
5. according to the method for claim 1 described current signal linear transmission, it is characterized in that: I
S+, I
S-, V
G-, V
G+, V
O+, V
O-Available any components and parts constitute by any way.
Priority Applications (1)
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CN200710127757A CN100593903C (en) | 2007-06-26 | 2007-06-26 | Current signal linear transmitting method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200710127757A CN100593903C (en) | 2007-06-26 | 2007-06-26 | Current signal linear transmitting method |
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CN101335501A true CN101335501A (en) | 2008-12-31 |
CN100593903C CN100593903C (en) | 2010-03-10 |
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ID=40197865
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103595356A (en) * | 2013-11-12 | 2014-02-19 | 四川和芯微电子股份有限公司 | High-frequency bandwidth amplifying circuit |
WO2018140206A1 (en) * | 2017-01-30 | 2018-08-02 | Cirrus Logic International Semiconductor Ltd. | Single-bit volume control |
US10418044B2 (en) | 2017-01-30 | 2019-09-17 | Cirrus Logic, Inc. | Converting a single-bit audio stream to a single-bit audio stream with a constant edge rate |
-
2007
- 2007-06-26 CN CN200710127757A patent/CN100593903C/en not_active Expired - Fee Related
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103595356A (en) * | 2013-11-12 | 2014-02-19 | 四川和芯微电子股份有限公司 | High-frequency bandwidth amplifying circuit |
CN103595356B (en) * | 2013-11-12 | 2016-08-17 | 四川和芯微电子股份有限公司 | High frequency bandwidth amplifying circuit |
WO2018140206A1 (en) * | 2017-01-30 | 2018-08-02 | Cirrus Logic International Semiconductor Ltd. | Single-bit volume control |
US10418044B2 (en) | 2017-01-30 | 2019-09-17 | Cirrus Logic, Inc. | Converting a single-bit audio stream to a single-bit audio stream with a constant edge rate |
GB2572712A (en) * | 2017-01-30 | 2019-10-09 | Cirrus Logic Int Semiconductor Ltd | Single-bit volume control |
US10509624B2 (en) | 2017-01-30 | 2019-12-17 | Cirrus Logic, Inc. | Single-bit volume control |
US11107485B2 (en) | 2017-01-30 | 2021-08-31 | Cirrus Logic, Inc. | Converting a single-bit audio stream to a stream of symbols with a constant edge rate |
GB2572712B (en) * | 2017-01-30 | 2021-10-20 | Cirrus Logic Int Semiconductor Ltd | Single-bit volume control |
US11621012B2 (en) | 2017-01-30 | 2023-04-04 | Cirrus Logic, Inc. | Direct mapping |
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Publication number | Publication date |
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