A TV-Module for DC-Baseline Compensation in Analog Front-End Design

In the design of analog front-end electronics (FEE) for particle beam energies, the circuit is prone to several shortcomings to ensure accurate extraction of particle data in the semiconductor device. Among these problems, the frequency variability that leads to baseline shift affecting the amplitude /energy detection of particles is recurrent. It impinges on the effective energy extracted from the semiconductor material system. In this work, we propose a correction circuit to solve the above-mentioned problem while preserving the bandwidth characteristics of the analog filter. The proposed circuit is a time-variant high-pass filter based on complementary switches S1 and S2, which stabilise the output baseline of the front-end circuit. Post-layout simulation analysis has been performed and the results are quite promising. That allows the output swing to be switched within the detected baseline and a given voltage, controlled by the discriminator threshold level. The design has been validated by post-layout simulation results, performed in a 65 nm CMOS process from TSMC, under 1.2 V supply voltage.