Jitter and Phase Noise Analysis of Light to Frequency Converter Circuit Applicable for Biomedical Applications

This paper describes the new paradigm of control-ling and optimization of the jitter noise in the transimpedance amplifier-TIA circuit of the light-to-frequency converter design. In this study, the primary circuit blocks of the light to frequency converter include the transimpedance amplifier-TIA, a low dropout regulator an integrator and a pulse generator. The noise optimisation scheme in this work exploits a new methodology to control the jitter noise in the driver-circuit of the TIA. The study involves both the mathematical and the simulation analysis to prove the theory suggested. Jitter noise performance of the design was perceived through periodic steady state analysis (PSS) and periodic noise analysis (Pnoise). An outstanding mutual agreement between the mathematical analysis and the obtained waveform results was seen throughout the study. RMS Jitter noise behavior was focused and pitched from the periodic phase noise waveforms obtained during the analysis. The conversion of the phase noise into the jitter and the effect of spur jitter on the RMS jitter is exclusively discussed in this study. The design requires a 3.3 V supply voltage and an initial input current of 125pA. The CMOS transistor level implementation of the design was simulated with 40nm SMIC technology node in cadence Virtuoso IC-615.