CN1342906A - 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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- CN1342906A CN1342906A CN 00124705 CN00124705A CN1342906A CN 1342906 A CN1342906 A CN 1342906A CN 00124705 CN00124705 CN 00124705 CN 00124705 A CN00124705 A CN 00124705A CN 1342906 A CN1342906 A CN 1342906A
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Abstract
An impedance-transforming amplifier is composed of a singal current input buffer consisting of two FETs and one resistor, a resistor-analogous circuit consisting of one resistor, two buffer sets, one coupling capacitor and one bias resistor, and an amplifier. Its advantages include broad band, high efficiency, low noise, background DC isolation, and high sensitivity and amplification ratio.
Description
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.
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.
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.
Impedance-transforming amplifier with the wideband of the present invention of above-mentioned advantage, high signal coupling efficiency, low noise and isolated background DC current, described amplifying circuit is by a marking current input buffer circuit; One simulative resistance circuit and an amplifying circuit are formed.Described marking current input buffer circuit is made of two field effect transistors and a resistance, has the function of high electric current input efficiency and lifting circuit frequency range; Described simulative resistance circuit is by a resistance; Two groups of impact dampers; One coupling capacitance and a bias resistance constitute, and have the function that improves the signal coupling efficiency and reduce the noise output voltage.
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, one of B resistance R 1 end points, E signal circuit input point.
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 field effect electric crystal J1, a field effect electric crystal 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 field effect electricity brilliant pipe J1 and resistance R J-shaped become a fixed current source, source S 1 voltage of field effect transistor J1 is fixed, this source S 1 voltage also can provide fixed field effect electricity crystalline substance to manage the compole G2 voltage of J2, thereby but the electric capacity of source S 2 ends of isolation camp effect transistor J2 is to the influence of the extraction electrode D2 end of the brilliant pipe of field effect electricity J2, this constitutes a current source framework, and the present invention utilizes the contact of the source S 2 of the extraction electrode D1 of field effect transistor J1 and 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 first group of impact damper U1 circuit, the output of second group of impact damper U2 is then controlled changes the voltage of impedance amplifier input node A behind bias resistance Rb, and the output of first group of impact damper U1 connects the input of second group of 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;
Described impedance-transforming amplifier can promote the frequency range of this circuit via the marking current input buffer circuit, this frequency range can provide a perform region to simulative resistance circuit, when simulative resistance circuit works in low frequency, can pass through the lot of background electric current, when working in high frequency, can improve the efficient that signal is coupled into changes impedance amplifier, and reduce the output voltage of noise, to promote the sensitivity and the magnification of impedance-transforming amplifier probe current signal.
2. impedance-transforming amplifier according to claim 1 is characterized in that, wherein said marking current input buffer circuit is made of a resistance R j, field effect transistor J1 and field effect transistor J2.
3. marking current input buffer circuit according to claim 2 is characterized in that, a wherein said current source is the current source that is made of its field effect transistor J1 and resistance R J series connection.
4. the impedance-transforming amplifier of wideband according to claim 2, high signal coupling efficiency, low noise, isolated background DC current, it is characterized in that, the source voltage of field effect transistor J1 in the wherein said marking current input buffer circuit is fixed, but and pole tension between its source voltage fixed field effect transistor J2, to form a string folded framework.
5. impedance-transforming amplifier according to claim 3 is characterized in that, the source electrode of the extraction electrode of the field effect transistor J1 in the described marking current input buffer circuit and another field effect transistor J2, and its tie point is the input point for marking current.
6. impedance-transforming amplifier according to claim 1 is characterized in that, wherein said simulative resistance circuit is by a resistance R 1; One coupling capacitance C2; One bias resistance Rb; Impact damper U1 and impact damper U2 constitute.
7. impedance-transforming amplifier according to claim 6, it is characterized in that, the structure of wherein said simulative resistance circuit is to be obtained by impact damper U1 circuit to change impedance amplifier input node voltage, the output of another impact damper U2 is then controlled changes the voltage of impedance amplifier input node A behind bias resistance Rb, and the output of impact damper U1 is the input that connects impact damper U2 behind coupling capacitance C2.
8. impedance-transforming amplifier according to claim 6 is characterized in that, comprises two groups of impact damper U1 and U2 in the wherein said simulative resistance circuit, and 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. |
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| 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. |
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| Publication Number | Publication Date |
|---|---|
| CN1342906A true CN1342906A (en) | 2002-04-03 |
| CN1162708C 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109962685A (en) * | 2017-12-14 | 2019-07-02 | 财团法人工业技术研究院 | Wideband turns impedance amplifier circuit |
| CN113670345A (en) * | 2021-08-10 | 2021-11-19 | 之江实验室 | Low-noise photoelectric detection device for decomposing photocurrent signal |
-
2000
- 2000-09-13 CN CNB001247050A patent/CN1162708C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109962685A (en) * | 2017-12-14 | 2019-07-02 | 财团法人工业技术研究院 | Wideband turns impedance amplifier circuit |
| CN109962685B (en) * | 2017-12-14 | 2023-05-26 | 财团法人工业技术研究院 | Broadband transimpedance amplifier circuit |
| CN113670345A (en) * | 2021-08-10 | 2021-11-19 | 之江实验室 | Low-noise photoelectric detection device for decomposing photocurrent signal |
| 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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| Publication number | Publication date |
|---|---|
| CN1162708C (en) | 2004-08-18 |
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Granted publication date: 20040818 Termination date: 20120913 |