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High-sensitivity front-end circuit of transimpedance amplifier (TIA)

A transimpedance amplifier and front-end circuit technology, applied in the electrical field, can solve the problem of insufficient sensitivity of the transimpedance amplifier, achieve the effect of improving bandwidth and sensitivity, increasing transmission speed or transmission distance, and expanding the scope of application

Inactive Publication Date: 2011-11-16
佛山敏石芯片有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-sensitivity transimpedance amplifier front-end circuit, aiming at solving the problem that the sensitivity of the existing transimpedance amplifier is not high enough

Method used

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Embodiment Construction

[0019] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0020] The front-end circuit of existing transimpedance amplifier is generally common source FET inverting amplifier (as figure 1 shown) or a common-emitter triode inverting amplifier (such as figure 2 shown).

[0021] exist figure 1 , the drain of the first FET M1 passes through the load resistor R L It is connected to the power supply VDD, the gate of the first field effect transistor M1 is connected to the anode of the photodiode, and the source of the first field effect transistor M1 is grounded. The drain of the second field effect transistor M2 is connected to the constant voltage power supply VDD, the gate of the second field effect transistor M2 is connected to the drain of the first field effect transistor M1, and the source...

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Abstract

The invention discloses a high-sensitivity front-end circuit of a transimpedance amplifier (TIA). In the front-end circuit, a broadband amplifier is added between a load resistor and a second field-effect transistor in an existing circuit; the broadband amplifier comprises a third field-effect transistor, a fourth field-effect transistor, a second load resistor and a third load resistor; one end of the second load resistor is connected with a drain electrode of the third field-effect transistor and the other end of the second load resistor is connected with a power supply; one end of the third field-effect transistor is connected with a drain electrode of the fourth field-effect transistor and the other end of the third field-effect transistor is connected with the power supply; a grid electrode of the third field-effect transistor is connected with a drain electrode of the first field-effect transistor; a grid electrode of the fourth field-effect transistor is connected with a first input voltage and is earthed by a second capacitor; source electrodes of the third field-effect transistor and the fourth field-effect transistor are earthed respectively by a current source; and a grid electrode of the second field-effect transistor is connected with the drain electrode of the fourth field-effect transistor. The high-sensitivity front-end circuit can improve the bandwidth and sensitivity of the transimpedance amplifier remarkably and strengthen the transmission rate of the photoelectric signals or enlarge the transmission distance of the photoelectric signals.

Description

technical field [0001] The invention relates to the field of electricity, in particular to a front-end circuit of a high-sensitivity transimpedance amplifier. Background technique [0002] A transimpedance amplifier is an electronic circuit that converts a current signal into a voltage signal and amplifies it. One of its most common uses is as a preamplifier for optical signal receivers in optoelectronic communication technology. The front end of the transimpedance amplifier is generally composed of a single-stage inverting amplifier and a parallel feedback. The inverting amplifier is usually composed of a common source field effect transistor or a common emitter triode and a load resistor. Transimpedance amplifiers are typically broadband amplifiers. The product of its bandwidth and gain depends on the product of bandwidth and gain of the inverter. The conversion gain is determined by the value of the parallel feedback resistor. [0003] Since the transimpedance amplif...

Claims

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Application Information

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IPC IPC(8): H03F3/08
Inventor 徐延臻
Owner 佛山敏石芯片有限公司
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