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一种用于低频微弱信号采集的通用放大器设计
资料介绍
采用CSMC 0.5μm 2P3M工艺设计用于低频微弱信号采集的通用前置放大器。放大器采用全差分的交流耦合-电容反馈结构，提高输入阻抗。采用PMOS伪电阻技术，高通截止点可随栅极偏压调节，适用于采集不同频率范围的低频信号。测试放大器增益为45.2 dB，高通截止点在1 Hz～10 kHz范围内调节，放大器的低通截止点为7 kHz。100~7000 Hz范围内放大器的等效输入噪声电压为17.8μV。
A general purpose amplifier for low-frequency weak signal acquisition fabricated in CSMC 0.5μm 2P3M process is presented. The amplifier adopts full differential structure with AC-coupled and capacitive feedback, the input resistor is boosted and bandwidth can be adjusted. The amplifier uses PMOS pseudo resistor to realize the adjustment of high pass cutoff frequency through adjusting gate voltage, which suits different low-frequency weak signal acquisition. The tested gain of the amplifier is 45.2 dB. The high pass cutoff frequency can be adjusted from 1 Hz to 10 kHz. The equivalent input-referred noise within 100 Hz and 7 kHz is 17.8μV.
部分文件列表
| 文件名 | 大小 |
| 一种用于低频微弱信号采集的通用放大器设计.pdf | 266K |
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