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介绍了一种适用于ISFET读出的高精度CMOS运放设计.该运放可为ISFET提供恒定电流、电压偏置,从而便于构建读出电路并于微传感器单片集成.通过运用连续时间自调零技术,大大降低了运放的失调电压、1/f噪声和温漂等低频噪声.该设计基于0.35μm CMOS工艺,电源电压3.3V,运放的开环增益超过100dB,输入等效失调电压低至11μV,总功耗仅为1.48mW.应用该运放实现的pH微传感器已通过实验验证.
A high-precision CMOS op amp design for ISFET readout is presented, which provides a constant current and voltage bias for the ISFET to facilitate the construction of the readout circuitry and monolithic integration with the micro-sensor. By using continuous-time Zeroing technology greatly reduces the op amp offset voltage, 1 / f noise and temperature drift and other low-frequency noise.The design is based on 0.35μm CMOS technology, the supply voltage of 3.3V, operational amplifier open-loop gain of more than 100dB, the input equivalent offset The voltage is as low as 11μV and the total power dissipation is only 1.48mW. The pH micro-sensor implemented using this op amp has been experimentally validated.