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High out-of-band rejection trans-impedance amplifier

A technology of transimpedance amplifiers and amplifiers, applied in the direction of DC-coupled DC amplifiers, differential amplifiers, etc., can solve problems such as the decrease of out-of-band suppression force, and achieve the effect of improving the out-of-band suppression force

Inactive Publication Date: 2015-11-04
TSINGHUA UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0010] According to the pole-zero expression, it can be found that the transimpedance amplifier is a four-pole and four-zero system, which will lead to a decrease in its out-of-band rejection

Method used

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Embodiment Construction

[0033] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

[0034] The present invention proposes a transimpedance amplifier with high out-of-band rejection, such as figure 2 shown, including:

[0035] a first differential operational amplifier (101), a second differential operational amplifier (102), capacitors (111, 112, 113, 114, 151, 152) and resistors (121, 122, 131, 132, 141, 142);

[0036] The input terminal of the first differential operational amplifier (101) is used for connecting to an input signal source; the non-inverting output terminal of the first differential operational amplifier (101) is connected to the second differential operational amplifier (102) through a resistor (142). ) is connected to the inverting input terminal of the f...

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Abstract

The invention relates to a high out-of-band rejection trans-impedance amplifier, suitable to be used but not be limited in a down-conversion mixer circuit of a software radio transceiver. The trans-impedance amplifier comprises a first differential operational amplifier (101), a second differential operational amplifier (102), capacitors (111, 112, 113, 114, 151, 152), and resistors (121, 122, 131, 132, 141, 142). The normal phase output end of the first differential operational amplifier is connected with the inverted input end of the second differential operational amplifier through the resistors. The inverted output end of the first differential operational amplifier is connected with the normal phase input end of the second differential operational amplifier through the resistors. Two ends of the capacitor (151) are connected with the normal phase input end and the inverted input end of the first differential operational amplifier (101). Two ends of the capacitor (152) are connected with the normal phase input end and the inverted input end of the second differential operational amplifier (102). Through respectively adding the capacitors on the input ends of the differential operational amplifier (101, 102), improvement of out-of-band rejection of the trans-impedance amplifier is realized.

Description

technical field [0001] The invention relates to the technical field of semiconductor integrated circuit design, in particular to a transimpedance amplifier with high out-of-band suppression. Background technique [0002] A transimpedance amplifier (TIA) is typically used to convert an input current signal to a corresponding output voltage signal. A typical TIA is typically used in a system that receives a current signal from a sensor, and the current signal output from the sensing device is received by the TIA and converted into a corresponding voltage signal that can be processed by a processor. [0003] In addition to sensor systems, RF receiver systems are increasingly using transimpedance amplifiers, with the main field of application being down-mixers. At present, there are two types of passive down-mixer structures: voltage type (passive voltage type mixer + transconductance amplifier + transimpedance amplifier) ​​and current type (transconductance amplifier + passive...

Claims

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Application Information

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IPC IPC(8): H03F3/45
Inventor 池保勇张欣旺张泽宏王志华
Owner TSINGHUA UNIV
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