Zhao Guofen, Zhao Yiqiang, Zhao Gongyuan, Zhang Zhiheng, Guo Zhaomin. Design of front-end circuit for uncooled diode infrared detector[J]. Infrared and Laser Engineering, 2016, 45(1): 104001-0104001(6). doi: 10.3788/IRLA201645.0104001
| Citation:
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Zhao Guofen, Zhao Yiqiang, Zhao Gongyuan, Zhang Zhiheng, Guo Zhaomin. Design of front-end circuit for uncooled diode infrared detector[J]. Infrared and Laser Engineering, 2016, 45(1): 104001-0104001(6). doi: 10.3788/IRLA201645.0104001
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Design of front-end circuit for uncooled diode infrared detector
- 1.
ASIC Design Center,School of Electronic and Information Engineering,Tianjin University,Tianjin 300072,China;
- 2.
Sea Eagle Optoelectronic Information Technology Co.,Ltd.,Tianjin 300192,China
- Received Date: 2015-05-05
- Rev Recd Date:
2015-06-03
- Publish Date:
2016-01-25
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Abstract
A front-end circuit for uncooled diode infrared detector, composed of Gm-C-OP integrated amplifier, was designed. The small input voltage steered from diode detector was transferred into current by an operational transconductance amplifier(OTA), and then the current was converted to voltage by a capacitor transimpedance amplifier(CTIA). The OTA used a current feedback loop to achieve higher linearity and transconductance than the traditional one. By adopting differential input structure, Gm-C-OP integrated amplifier can eliminate the effect of ambient temperature and process on the output signal of detectors. The circuit was fabricated in a 0.35 m CMOS process under 5 V supply voltage. The Gm-C-OP integrated amplifier occupies an area of 0.012 6 mm2. The input differential voltage varied from 0 to 5 mV. Testing results show that the transconductance of OTA is in accordance with the simulation results. The Gm-C-OP integrated amplifier can convert the dynamic small input voltage into a proper voltage linearly and the linearity is 97%. The output range exceeds 2 V.
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