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Amplifying circuit for high-frequency signal common mode rejection based on current feedback operational amplifier

A current feedback and amplifying circuit technology, applied in the direction of DC-coupled DC amplifiers, amplifiers with semiconductor devices/discharge tubes, amplifiers, etc. Mode gain and other issues to achieve high-precision discrimination, high-bandwidth characteristics, and suppression of common-mode signals and noise

Pending Publication Date: 2017-12-01
ZHEJIANG QUANTUM TECH CO LTD
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Problems solved by technology

However, in the radio frequency field, the method of first subtracting the power and then amplifying the RF, the frequency characteristics of the gain are greatly affected by the discrete parameters, and cannot meet the requirements of common-mode suppression. Limitation of dynamic range, can not meet the requirements of high differential mode gain

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  • Amplifying circuit for high-frequency signal common mode rejection based on current feedback operational amplifier
  • Amplifying circuit for high-frequency signal common mode rejection based on current feedback operational amplifier
  • Amplifying circuit for high-frequency signal common mode rejection based on current feedback operational amplifier

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Embodiment Construction

[0013] The present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0014] Such as figure 1 As shown, an amplifying circuit based on a current feedback operational amplifier to realize common-mode rejection of high-frequency signals is composed of n-stage instrument amplifier circuits 100 cascaded, wherein, n≥1, and the instrument amplifier circuits 100 of each stage are It is composed of two current feedback operational amplifiers 110 connected in parallel, the inverting input terminal and output terminal of the current feedback operational amplifier 110 are connected with a feedback resistor Rf, and the two current feedback operational amplifiers of the instrument amplifier circuit 100 of the same stage The inverting input ends of 110 are all connected through the gain resistor Rg and the capacitor Cg, and the first-stage instrumentation amplifier circuit includes a current fee...

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Abstract

The invention provides an amplifying circuit for high-frequency signal common mode rejection based on a current feedback operational amplifier. The amplifying circuit is composed of n levels of cascaded instrument amplifying circuits, wherein n is not smaller than 1, each level of instrument amplifying circuit is composed of two current feedback operational amplifiers, the same-phase input end of the current feedback operational amplifier B is connected with a peak signal source, the same-phase input end of the current feedback operational amplifier A is connected with a snow slide signal source (the snow slide signal source is superposed on a peak pulse signal), and the output end of the current feedback operational amplifier An and the output end of the current feedback operational amplifier Bn are respectively connected with the two input ends of the same radio frequency transformer T. The amplifying circuit solves the technical defect that the radio frequency amplifier cannot realize a high difference mode gain and has the advantages of high rejection ratio; and the high bandwidth property satisfies the demand of high frequency signal processing, meanwhile the problem of limited current feedback gain is solved by using the cascaded gain manner, and the objective of high-precision screening of snow slide signals is also achieved.

Description

technical field [0001] The invention relates to the technical field of high-speed analog signal conditioning circuits for single-photon detectors, in particular to an amplifying circuit based on a current feedback operational amplifier to realize common-mode suppression of high-frequency signals. Background technique [0002] In quantum key distribution (QKD), parameters such as dark count rate, post-pulse count rate, and dead time of single photon detectors based on avalanche diodes are limited by the performance of the avalanche signal conditioning circuit. Because in the gating mode, the gating signal is capacitively coupled into the signal path through the avalanche diode junction, thus generating a spike whose amplitude is several tens of times that of the avalanche signal; while the avalanche signal conditioning circuit amplifies the avalanche signal, it needs to Spike pulses are suppressed to ensure that the back-end circuit can discriminate small enough avalanche sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
CPCH03F3/45479
Inventor 周朝阳曹文钊赵义博
Owner ZHEJIANG QUANTUM TECH CO LTD
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