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引用次数: 10
摘要
介绍了一种用于驻极体传声器的gm-opamp-RC型CMOS线性前置放大器。跨导放大器(gm-cell)作为前置放大器输入级的V/I转换器，在其输入对处采用负反馈回路，以增强输出电流的线性度。反馈回路使前置放大器的SFDR提高了9 dB。模拟峰值信噪比和失真比(SNDR)为62 dB, 100mvpp, 2pf开关电容负载为2.56 MHz。前置放大器工作在1.8 V电源电压下，总电流消耗为190mua。它是为0.18 μ m CMOS技术设计的。
A CMOS linear preamplifier design for electret microphones
A gm-opamp-RC configured CMOS linear preamplifier for electret microphone is presented in this paper. The transconductance amplifier (gm-cell), as a V/I convertor at the input stage of the preamplifier, adopts a negative feedback loop at its input pair to enhance the linearity of the output current. Feedback loop improves the SFDR of the preamplifier by 9 dB. Simulated peak signal-to-noise and distortion ratio (SNDR) is 62 dB at 100 mVpp with 2 pF switching capacitor load at 2.56 MHz. The preamplifier operates under 1.8 V supply voltage and the total current consumption is 190 muA. It has been designed for a 0.18 mum CMOS technology.
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