论文部分内容阅读
提出了一种用于水听器电压检测的模拟前端电路,包括低噪声低失调斩波运算放大器,跨导电容(gm-C)低通滤波器,增益放大器三部分主体电路;低噪声低失调斩波运算放大器用于提取水听器前端传感器输出的微弱电压信号;gm-C低通滤波器用于滤除电压信号频率外的高频噪声和高次谐波;最后经过增益放大器放大至后级模数转换器的输入电压范围,输出数字码流;芯片采用台积电(TSMC)0.18μm单层多晶硅六层金属(1P6M)CMOS工艺实现。测试结果表明,在电源电压1.8 V,输入信号25 kHz和200 kHz时钟频率下,斩波运放输入等效失调电压小于110μV;整体电路输出信号动态范围达到80 dB,功耗5.1 mW,满足水听器的检测要求。
An analog front-end circuit for hydrophone voltage detection is proposed, which includes a low-noise and low-offset chopping operational amplifier, a gm-C low-pass filter and a gain amplifier. The low noise and low offset Chopping op amp is used to extract the faint voltage signal from the front sensor of hydrophone; gm-C low-pass filter is used to filter out the high-frequency noise and higher harmonics outside the frequency of the voltage signal; finally amplified by the gain amplifier to the rear stage Digital converter input voltage range, the output digital code stream; chip using TSMC 0.18μm single-layer polysilicon six metal (1P6M) CMOS technology to achieve. The test results show that the equivalent offset voltage of chopper op amp input is less than 110μV at a supply voltage of 1.8 V, input signals of 25 kHz and 200 kHz, and the overall circuit output signal has a dynamic range of 80 dB and consumes 5.1 mW of power, satisfying water Listener testing requirements.