CN1162708C - Broad-band low-noise efficient impedance-transforming amplifier with isolated background DC. - Google Patents
Broad-band low-noise efficient impedance-transforming amplifier with isolated background DC. Download PDFInfo
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- CN1162708C CN1162708C CNB001247050A CN00124705A CN1162708C CN 1162708 C CN1162708 C CN 1162708C CN B001247050 A CNB001247050 A CN B001247050A CN 00124705 A CN00124705 A CN 00124705A CN 1162708 C CN1162708 C CN 1162708C
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Abstract
The present invention relates to a running resistance amplifying circuit with broad frequency, high signal coupling efficiency, low noise and isolation from background direct current DC. The running resistance amplifying circuit is composed of a signal current input buffer circuit, a simulation resistance circuit and an amplification circuit, wherein the signal current input buffer circuit is composed of two field effect transistors and a resistor and has high current input efficiency and the function of enhancing the frequency bandwidth of the circuit; the simulation resistance circuit is composed of a resistor, two sets of buffers, a coupling capacitor and a bias resistor; the running resistance amplifying circuit can pass through a huge amount of background direct current DC when the frequency is low and can enhance the signal coupling efficiency and lower the output voltage of noise when the frequency is high; the whole running resistance amplifying circuit can greatly enhance the sensitivity and the magnification for using the running resistance amplifying circuit to detect current signals.
Description
Technical field
The invention relates to the impedance-transforming amplifier of a kind of wideband, high signal coupling efficiency, reduction noise and isolated background DC current, particularly about a kind of lifting frequency range, high signal coupling efficiency and reduce noise, and the high sensitivity impedance-transforming amplifier framework with isolated background DC current function.
Background technology
The impedance-transforming amplifier of known isolated background DC current is surveyed through being usually used in current signal, for example: the inspection optical circuit, it be with light signal after the photometry diode converts electric current to, amplify again and convert voltage signal output to, the receiving circuit of optical communication promptly is to utilize this circuit to constitute; Its main composition as shown in Figure 1, in this circuit constitutes for preventing in the DC current inflow amplifying circuit 1, adopt a coupling capacitance C that its DC current is isolated, the coupling efficiency of its marking current Is is R1/ (R1+Za), wherein this Za sees equiva lent impedance into the amplifier end by signal end, its output signal voltage is Vs=Is * [R1 * R2/ (R1+Za)], output noise voltage is Vn=In * R2+Vn (1+R2/R1), its In is a noise current, the influence of this noise current In is very little, can ignore, from above-mentioned derivation mode, can clearly know as long as high more, just can obtain the higher signal coupling efficiency and reduce the noise output voltage the lifting of the value of R1.But under the influence of considering background DC current Ia, Ia * R1＜Vcc.Just can't under overall background DC current Ia, work when therefore, the R1 value is excessive.
This shows that the formation of above-mentioned known circuits still has many shortcomings, await the deviser and redesign novel circuit and replace existing known circuits.
Every shortcoming of being derived in the impedance-transforming amplifier formation of the present invention in view of above-mentioned isolated background DC current, this is pressed in addition design improved innovation, and after concentrating on studies through taking great pains to attain one's goal for many years, successfully the impedance-transforming amplifier of wideband of the present invention, high signal coupling efficiency, low noise and isolated background DC current is finished in research and development finally.
Summary of the invention
The objective of the invention is to, the impedance-transforming amplifier of a kind of wideband, high signal coupling efficiency, low noise and energy isolated background DC current is provided, described circuit is by its marking current input buffer circuit, to reach the frequency range of high electric current input efficiency and lifting circuit, so that make simulative resistance circuit when low frequency operation, can pass through the lot of background DC current; And when high-frequency work, can improve signal to be coupled into the efficient of changeing impedance amplifier and to reduce output noise voltage, make this impedance-transforming amplifier can possess high current/voltage conversion gain and low noise, to reach higher sensitivity.
Have the impedance-transforming amplifier of of the present invention a kind of wideband of above-mentioned advantage, high signal coupling efficiency, low noise and isolated background DC current, it is characterized in that described amplifying circuit comprises:
One marking current input buffer circuit, described circuit can be sent to marking current effectively changes impedance amplifier input node, and the capacity effect that while isolation signals source may exist is to promote the frequency range of circuit;
One simulative resistance circuit, this circuit working can pass through the lot of background DC current when low frequency, and when working in high frequency, can promote the signal coupling efficiency and reduce the voltage of output noise; And
One amplifying circuit can be used for amplifying signal;
Wherein the current input signal source one end ground connection other end is connected in the second field effect transistor J2 source electrode, and connect first field effect transistor J1 drain electrode, the second field effect transistor J2 grid is connected in ground connection behind the first field effect transistor J1 source electrode and the resistance R J, second field effect transistor J2 drain electrode connects the input end of first impact damper, resistance R 1 and capacitor C 1, the first buffer output end AC coupling connects capacitor C 2 and connects the input end of second impact damper again and Dc bias resistance R b is provided an end, second buffer output end connects resistance R 1 one ends, resistance R 1 other end feedback is connected in the input end of first impact damper, and via capacitor C 1 AC coupling to amplifier negative input and resistance R 2 one ends, and the amplifier anode input end grounding, utilize resistance R 2 to be fed back to the amplifier out output signal, form wideband, high signal coupling efficiency, reduce noise, the circuit of the impedance-transforming amplifier of anti-background DC current.
Wherein electric current input buffer circuit second field effect transistor J2 drain electrode connects input end, the resistance R 1 and capacitor C 1 that gain is 1 first impact damper, first buffer output end connects capacitor C2 and forms AC coupling and connect gain again for the input end of 1 second impact damper and Dc bias resistance R b is provided an end, second buffer output end connects resistance R 1 one ends, and the input end that resistance R 1 other end feedback is connected in first impact damper forms artifical resistance.
Wherein said first field effect transistor J1 and resistance R J series connection constitute a current source.
Wherein the second field effect transistor J2 source electrode connects first field effect transistor J1 drain electrode, its grid is connected in ground connection behind the first field effect transistor J1 source electrode and the resistance R J, its drain electrode connects input end, the resistance R 1 and capacitor C 1 of first impact damper, this second field effect transistor J2 is with the common grid circuit framework, just have anti-group of input and the anti-group of high output characteristic as current buffer, form the current buffering circuit framework, therefore the second field effect transistor J2 equivalent capacitance value and then the cue circuit frequency range that exist of isolation signals source effectively.
The contact that described first field effect transistor J1 drain electrode is connected in the second field effect transistor J2 source electrode is the marking current input point.
Wherein said simulative resistance circuit is by a resistance R 1; One coupling capacitance C2; One bias resistance Rb; The first impact damper U1 and the second impact damper U2 constitute.
The structure of wherein said simulative resistance circuit is to be obtained by the first impact damper U1 circuit to change impedance amplifier input node voltage, the output of another second impact damper U2 is then controlled changes the voltage of impedance amplifier input node A behind bias resistance Rb, and the output of the first impact damper U1 is the input that connects the second impact damper U2 behind coupling capacitance C2.
Comprise two groups of impact dampers in the wherein said simulative resistance circuit: the first impact damper U1 and the second impact damper U2, it forms a bootstrap framework with capacitive coupling.
Description of drawings
By consulting the detailed description and the accompanying drawing thereof of following relevant one embodiment of the present invention, can further understand technology contents of the present invention and purpose effect thereof; The accompanying drawing of relevant this embodiment is:
Fig. 1 is for generally having the impedance-transforming amplifier Organization Chart of isolated background direct current; And
Fig. 2 is the pie graph of the impedance-transforming amplifier of wideband of the present invention, high signal coupling efficiency, low noise, isolated background DC current.
What each symbol was represented among the figure is: 1 amplifying circuit, and 2 simulative resistance circuits, 3 marking current input buffer circuits, 4 amplifying circuits, A change impedance amplifier input node, an end points of B resistance R 1, E signal circuit input point.
Embodiment
Consult shown in Figure 2ly, it is the pie graph of the impedance-transforming amplifier of wideband provided by the present invention, high signal coupling efficiency, low noise, isolated background DC current, and described amplifying circuit mainly includes: a marking current input buffer circuit 3; One simulative resistance circuit 2 and an amplifying circuit 4 are formed, this marking current buffer circuit 3 is by the first field-effect transistor J1, the second field-effect transistor J2 and a resistance R J constitute, its major function is effectively marking current Is to be sent to commentaries on classics impedance amplifier input node A, but the capacity effect that while isolation signals source may exist is to promote the frequency range of circuit.
Wherein said first field effect transistor J1 and resistance R J-shaped become a fixed current source, source S 1 voltage of the first field effect transistor J1 is fixed, this source S 1 voltage also can provide the compole G2 that fixes the second field effect transistor J2 voltage, thereby the electric capacity of source S 2 ends that can isolate the second field effect transistor J2 is to the influence of drain D 2 ends of the second field effect transistor J2, this constitutes a current source framework, and the present invention utilizes the contact of the source S 2 of the drain D 1 of the first field effect transistor J1 and the second field effect transistor J2 to be marking current input point E cleverly, thereby the function that can obtain to have high electric current input efficiency and promote the circuit frequency range.
And, the structure of mimic channel 2 is to obtain the voltage that changes impedance amplifier input node A by the first impact damper U1 circuit, the output of the second impact damper U2 is then controlled changes the voltage of impedance amplifier input node A behind bias resistance Rb, and the output of the first impact damper U1 connects the input of the second impact damper U2 behind coupling capacitance C2, and form a bootstrap framework with capacitive coupling, when this simulative resistance circuit works in low frequency, its coupling capacitance C2 is equivalent to off state, making an end B of resistance R 1 is fixed voltage Vb, therefore from change impedance amplifier input node A see into resistance value be resistance R 1, so its resistance value can be identical with the value of resistance R 1, it just can pass through the lot of background DC current, and when working in high frequency, coupling capacitance is equivalent to short-circuit condition, one end B voltage of resistance R 1 becomes with the voltage that changes impedance amplifier input node A, and the voltage difference at resistance R 1 two ends is maintained fixed, thereby be impedance for high value for high-frequency signal, so it is very big that its resistance value can become, thereby the raising signal is coupled into the efficient of changeing impedance amplifier 4, and reduce the noise output voltage, make this impedance-transforming amplifier can possess high current/voltage conversion gain and low noise, to reach higher sensitivity.
The impedance-transforming amplifier of wideband provided by the present invention, high signal coupling efficiency, low noise and isolated background DC current when comparing mutually with other technology commonly used, has more following advantage:
1. the marking current input buffer circuit that is made of two field effect transistors and a resistance, described circuit can be realized high electric current input efficiency and promote the frequency range of circuit.
2. by a resistance, two groups of simulative resistance circuits that impact damper, a coupling capacitance and a bias resistance are constituted, described circuit is when low frequency operation, can pass through the lot of background DC current, and when high-frequency work, just can improve the efficient that signal is coupled into changes impedance amplifier, and reduce the noise output voltage.
3. the present invention can significantly promote the sensitivity and the magnification that utilize impedance-transforming amplifier to come the probe current signal on group effect.
Above-mentioned detailed description is specifying at a preferred embodiment of the present invention, but this embodiment is not in order to limit claim of the present invention, allly do not break away from the equivalence that skill spirit of the present invention does and implement or change, all should be contained in the scope of claim of the present invention.
Claims (8)
1. the impedance-transforming amplifier of a wideband, high signal coupling efficiency, low noise and isolated background DC current is characterized in that described amplifying circuit comprises:
One marking current input buffer circuit, described circuit can be sent to marking current effectively changes impedance amplifier input node, and the capacity effect that while isolation signals source may exist is to promote the frequency range of circuit;
One simulative resistance circuit, this circuit working can pass through the lot of background DC current when low frequency, and when working in high frequency, can promote the signal coupling efficiency and reduce the voltage of output noise; And
One amplifying circuit can be used for amplifying signal;
Wherein the current input signal source one end ground connection other end is connected in the second field effect transistor J2 source electrode, and connect first field effect transistor J1 drain electrode, the second field effect transistor J2 grid is connected in ground connection behind the first field effect transistor J1 source electrode and the resistance R J, second field effect transistor J2 drain electrode connects the input end of first impact damper, resistance R 1 and capacitor C 1, the first buffer output end AC coupling connects capacitor C 2 and connects the input end of second impact damper again and Dc bias resistance R b is provided an end, second buffer output end connects resistance R 1 one ends, resistance R 1 other end feedback is connected in the input end of first impact damper, and via capacitor C 1 AC coupling to amplifier negative input and resistance R 2 one ends, and the amplifier anode input end grounding, utilize resistance R 2 to be fed back to the amplifier out output signal, form wideband, high signal coupling efficiency, reduce noise, the circuit of the impedance-transforming amplifier of anti-background DC current.
2. wideband according to claim 1, high signal coupling efficiency, the impedance-transforming amplifier of low noise and isolated background DC current, it is characterized in that, wherein electric current input buffer circuit second field effect transistor J2 drain electrode connects the input end that gain is 1 first impact damper, resistance R 1 and capacitor C 1, first buffer output end connects capacitor C2 and forms AC coupling and connect gain again for the input end of 1 second impact damper and Dc bias resistance R b is provided an end, second buffer output end connects resistance R 1 one ends, and the input end that resistance R 1 other end feedback is connected in first impact damper forms artifical resistance.
3. the impedance-transforming amplifier of wideband according to claim 2, high signal coupling efficiency, low noise and isolated background DC current is characterized in that, wherein said first field effect transistor J1 and resistance R J series connection constitute a current source.
4. wideband according to claim 2, high signal coupling efficiency, low noise, the impedance-transforming amplifier of isolated background DC current, it is characterized in that, wherein the second field effect transistor J2 source electrode connects first field effect transistor J1 drain electrode, its grid is connected in ground connection behind the first field effect transistor J1 source electrode and the resistance R J, its drain electrode connects the input end of first impact damper, resistance R 1 and capacitor C 1, this second field effect transistor J2 is with the common grid circuit framework, just have anti-group of input and the anti-group of high output characteristic as current buffer, form the current buffering circuit framework, therefore the second field effect transistor J2 equivalent capacitance value and then the cue circuit frequency range that exist of isolation signals source effectively.
5. the impedance-transforming amplifier of wideband according to claim 3, high signal coupling efficiency, low noise and isolated background DC current, it is characterized in that the contact that described first field effect transistor J1 drain electrode is connected in the second field effect transistor J2 source electrode is the marking current input point.
6. the impedance-transforming amplifier of wideband according to claim 1, high signal coupling efficiency, low noise and isolated background DC current is characterized in that, wherein said simulative resistance circuit is by a resistance R 1; One coupling capacitance C2; One bias resistance Rb; The first impact damper U1 and the second impact damper U2 constitute.
7. the impedance-transforming amplifier of wideband according to claim 6, high signal coupling efficiency, low noise and isolated background DC current, it is characterized in that, the structure of wherein said simulative resistance circuit is to be obtained by the first impact damper U1 circuit to change impedance amplifier input node voltage, the output of another second impact damper U2 is then controlled changes the voltage of impedance amplifier input node A behind bias resistance Rb, and the output of the first impact damper U1 is the input that connects the second impact damper U2 behind coupling capacitance C2.
8. the impedance-transforming amplifier of wideband according to claim 6, high signal coupling efficiency, low noise and isolated background DC current, it is characterized in that, comprise two groups of impact dampers in the wherein said simulative resistance circuit: the first impact damper U1 and the second impact damper U2, it forms a bootstrap framework with capacitive coupling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001247050A CN1162708C (en) | 2000-09-13 | 2000-09-13 | Broad-band low-noise efficient impedance-transforming amplifier with isolated background DC. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001247050A CN1162708C (en) | 2000-09-13 | 2000-09-13 | Broad-band low-noise efficient impedance-transforming amplifier with isolated background DC. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1342906A CN1342906A (en) | 2002-04-03 |
| CN1162708C true CN1162708C (en) | 2004-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB001247050A Expired - Fee Related CN1162708C (en) | 2000-09-13 | 2000-09-13 | Broad-band low-noise efficient impedance-transforming amplifier with isolated background DC. |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI688203B (en) * | 2017-12-14 | 2020-03-11 | 財團法人工業技術研究院 | Wideband transimpedance amplifier circuit |
| CN113670345B (en) * | 2021-08-10 | 2023-09-15 | 之江实验室 | Low-noise photoelectric detection device for photoelectric current signal decomposition |
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Granted publication date: 20040818 Termination date: 20120913 |