Wide voltage trans-impedance amplifier

A transimpedance amplifier, wide voltage technology, applied in the field of analog circuits, can solve problems such as difficulty in adapting to low voltage conditions, and achieve the effects of wide power supply range, high loop gain, and high output impedance

Active Publication Date: 2019-09-06
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure has twice the gate-source voltage and double the drain-source voltage from the power supply to the ground stack, which is difficult to adapt to low voltage conditions

Method used

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Examples

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Embodiment 1

[0013] Embodiment 1: as figure 1 As shown, the wide-voltage transimpedance amplifier of the present invention uses a common-gate amplifier to monitor the input voltage, uses a current mirror to enhance the transconductance of the input transistor, and simultaneously ensures a higher loop gain. The minimum power supply voltage of the transimpedance amplifier is lower than the traditional structure by a threshold voltage. The working principle of the circuit is analyzed as follows: the input current enters from the source of the common gate tube PM2, and is converted from the drain output to the load resistor R1 into an output voltage. Current source PM1 is responsible for solidifying the bias current of the gain boost amplifier. PM3 and NM1 form a common gate amplifier, which is used to detect the voltage fluctuation at the input terminal and amplify the error. The amplified voltage is converted into current through the NM2 tube, and mirrored to PM2 through PM5 to form a trans...

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PUM

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Abstract

The invention discloses a wide voltage trans-impedance amplifier. The trans-impedance amplifier is suitable for the field of low-voltage radio frequency receivers and other low-voltage and wide-voltage analog circuits, current-to-voltage conversion is achieved, the trans-impedance amplifier monitors input voltage through a common-gate amplifier, trans-conductance enhancement is achieved on an input tube through a current mirror, and meanwhile high loop gain is guaranteed. Compared with a trans-impedance amplifier of a traditional structure, the power supply voltage of the structure is reducedby the magnitude of threshold voltage, and the structure can work under lower power supply voltage. The circuit has the characteristics of wide power supply range, low minimum working voltage, low input impedance, high output impedance and the like.

Description

technical field [0001] The invention relates to an amplifier, in particular to a wide-voltage transimpedance amplifier, which belongs to the technical field of analog circuits. Background technique [0002] With the continuous reduction of the size of the integrated circuit process, the power supply voltage of the chip is constantly evolving towards a lower direction. However, due to the constraints of the leakage current of transistors, the threshold voltage of transistors does not continue to decrease with the feature size, but maintains at the level of 350mV~450mV, which brings challenges to traditional analog circuit design. As an important basic module for current-voltage conversion, transimpedance amplifiers are widely used in radio frequency communication circuits, sensor circuits and other common analog circuits. Transimpedance amplifiers based on transconductance enhancement technology and common-gate input have the characteristics of low input impedance and high o...

Claims

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Application Information

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IPC IPC(8): H03F1/02H03F1/56H03F3/45H03G3/30
CPCH03F1/0211H03F1/56H03F3/45179H03G3/30H03F1/0222H03F1/086H03F1/301H03F3/345H03F2200/513H03F2200/72
Inventor 陈超杨军刘新宁
Owner SOUTHEAST UNIV
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