In this paper, an analog correlator based analog front end with gain control circuit for hearing aid devices is designed and fabricated with 0.18 \(\upmu \mathrm{m}\) CMOS process. The proposed analog front end consists of an analog correlator comprised of a multiplier, an integrator, and a mixed mode variable gain amplifier. The analog correlator is utilized to ensure the low input referred noise. A gain control circuit is implemented in variable gain amplifier. Based on the output of piezoelectric microphone, designed gain control circuit automatically sets the gain. The investigated analog front end offers lower noise and wider dynamic range with compact size compared to conventional architecture. It achieves a 42 \(\mathrm{n}V_{rms}\) input referred noise and 84 dB signal to noise ratio. The total area of the designed analog front end circuit is 386 \(\upmu \mathrm{m}\)\(\times\) 569 \(\upmu \mathrm{m}\). Designed circuit is interfaced with a sensor model of piezoelectric microphone and its performance is successfully verified against simulation results.

在本文中，采用0.18 \（\ upmu \ mathrm {m} \） CMOS工艺设计和制造了用于助听器的带有增益控制电路的基于模拟相关器的模拟前端。拟议的模拟前端包括一个模拟相关器，该相关器包括一个乘法器，一个积分器和一个混合模式可变增益放大器。模拟相关器用于确保低输入参考噪声。在可变增益放大器中实现增益控制电路。根据压电麦克风的输出，设计的增益控制电路会自动设置增益。与传统架构相比，所研究的模拟前端具有较低的噪声和更宽的动态范围，并且尺寸紧凑。它达到42 \（\ mathrm {n} V_ {rms} \）输入参考噪声和84 dB信噪比。设计的模拟前端电路的总面积为386 \（\ upmu \ mathrm {m} \）\（\ times \） 569 \（\ upmu \ mathrm {m} \）。设计的电路与压电麦克风的传感器模型相连接，并根据仿真结果成功验证了其性能。