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Transimpedance amplifier applied to current mode passive mixer

A technology of transimpedance amplifiers and passive mixers, applied in amplifiers, amplifier combinations, improved amplifiers to expand bandwidth, etc., to achieve the effects of high filtering quality factor, excellent power consumption, high in-band and out-of-band linearity

Active Publication Date: 2020-11-06
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, to design a high-linearity transimpedance amplifier, the key is to design a high-gain, high-bandwidth transimpedance amplifier and ensure its stability. The core circuit of the source mixer - the transimpedance amplifier, is very challenging

Method used

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  • Transimpedance amplifier applied to current mode passive mixer
  • Transimpedance amplifier applied to current mode passive mixer
  • Transimpedance amplifier applied to current mode passive mixer

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] A transimpedance amplifier applied to current-mode passive mixers, such as figure 1 As shown, the transimpedance amplifier circuit 1 includes a three-stage transconductance amplifier circuit 2, resistors R1, R2, Rf1, Rf2, and capacitors C1, C2, Cf1, Cf2. The input terminal IN is connected to capacitors C1, C2 and resistors R1, R2, and the other end of capacitors C1, C2 is grounded. The other end of the resistors R1 and R2 is connected to the input end of the three-stage transconductance amplifier circuit 2 . One end of the resistors Rf1, Rf2 and capacitors Cf1, Cf2 is connected to the input end of the three-stage transconductance amplifier circuit 2, and the other end is connected to the output end of the three-stage transconductance amplifier circuit 2.

[0039] The transimpedance amplifier uses negative feedback to generate low input impedance. connected ac...

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Abstract

The invention discloses a transimpedance amplifier applied to a current mode passive mixer, the transimpedance amplifier is composed of a passive resistor capacitor and a three-stage transconductanceamplifier, the resistor is used for providing current-voltage conversion and providing a certain gain, and the capacitor is mainly used for filtering high-frequency blockage; the three-stage transconductance amplifier circuit is a high-gain broadband amplifier, optimization is mainly carried out on two main performance indexes of bandwidth and gain of the three-stage transconductance amplifier circuit, and the requirement for stability of the three-stage transconductance amplifier circuit is met through a zero compensation method instead of a traditional miller compensation method. The transimpedance amplifier serves as a core module circuit of a passive current mode mixer, integrates the functions of a trans-impedance amplifier and a channel filter, and achieves higher in-band and out-of-band linearity and higher filtering quality factor with the least filter order. And meanwhile, the noise performance and the layout area are also optimal.

Description

technical field [0001] The invention relates to a transimpedance amplifier technology applied to a current mode passive mixer, and belongs to the technical field of SAW-Less receivers. Background technique [0002] The commonly used SAW-Less receiver architecture is a current-mode direct-conversion receiver architecture, which consists of two core module circuits, a low-noise transconductance amplifier and a current-mode passive mixer. Among them, generally, the current mode passive mixer is composed of a passive switching mixing circuit and a transimpedance amplifier. The transimpedance amplifier is used to detect the down-converted current, and the performance indicators of the current mode passive mixer, such as noise, distortion and power consumption, are strictly related to the performance of the transimpedance amplifier. Therefore, in order to further improve the performance of the current mode passive mixer, the transimpedance amplifier needs to have the function of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/68H03F1/26H03F1/02H03F1/42H03F1/32H03F1/08H03D7/16
CPCH03F3/68H03F1/26H03F1/0205H03F1/42H03F1/3211H03F1/3205H03F1/083H03D7/16
Inventor 吴建辉陈先强李红
Owner SOUTHEAST UNIV
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