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Differential input low-temperature infrared detector weak current amplifier

An infrared detector and differential input technology, which is applied in the field of infrared detectors and low-temperature infrared detector weak current amplifiers, can solve the problems of limited system sensitivity, large interference, and large additional noise, and achieve repeatability and power supply voltage. Suppresses the high and overcomes the effect of easily oscillating

Inactive Publication Date: 2008-10-15
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to provide a low-noise weak current amplifier that can directly amplify the signal of the infrared detector, and solve the technical problems of large interference, large additional noise and limited system sensitivity caused by the normal temperature current preamplifier

Method used

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  • Differential input low-temperature infrared detector weak current amplifier
  • Differential input low-temperature infrared detector weak current amplifier
  • Differential input low-temperature infrared detector weak current amplifier

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Embodiment Construction

[0020] The specific embodiment of the present invention is described in further detail below in conjunction with accompanying drawing:

[0021] The total noise of this circuit is mainly determined by the input tubes M1 and M2, and the equivalent input noise voltage calculation formula is:

[0022] S v e ( f ) = 8 3 kT g m + K f C ox 2 WL 1 f (in g m = 2 K p W L I ds )...

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Abstract

The invention discloses a low-temperature infrared detector feeble current amplifier by differential input. The amplifier adopts a folded common-source and common-gate structure by differential input; a 41MOhm feedback resistor is integrated in a chip; a four-path integrated amplifier chip has the specification of only 3mmx1.9mm; the amplifier can directly convert a current signal of the infrared detector into a voltage signal and can normally operate at the normal temperature of 300 K and low temperature of 77 K; the amplifier can be not only used for amplifying an infrared detector signal but also used for amplifying a visible light detector signal; the 3dB bandwidth of the amplifier is 5KHz under the low temperature of 77K; the equivalent input current noise is 0.025PA / HZ<1 / 2> at 1KHz; and the minimal unit power can be lowered to 0.32mW.

Description

technical field [0001] The invention relates to preamplifier technology, specifically a low-temperature infrared detector weak current amplifier with differential input, which is used for infrared detectors working at a liquid nitrogen temperature of 77K. Background technique [0002] Infrared detectors and low-noise weak current preamplifiers are the core components of meteorological satellite remote sensing. In order to reduce the readout noise of the detector, it is ideal that the current preamplifier is packaged together with the infrared detector at a low temperature. However, since the commercially available amplifiers do not have the ability to work at low temperatures, the current design of remote sensing systems still adopts the working method of connecting the infrared detector and the current preamplifier separately at a long distance, that is, the HgCdTe infrared detector works at a deep and low temperature. The current preamplifier works at room temperature. T...

Claims

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Application Information

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IPC IPC(8): G01J1/44H03F3/45H03F1/26
Inventor 袁红辉陈永平陈世军刘强徐星王欣
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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