Noise analysis and optimization of VCII-based SiPM interface circuit

Recently, second generation voltage conveyor (VCII)-based transimpedance amplifiers (TIAs) have begun to find their way in different applications, among which, silicon photomultipliers (SiPMs) interfacing circuitry. There are many advantages which make VCII-based TIAs attractive over conventional circuits: the intrinsic low impedance at VCII current input Y port is very helpful to mitigate the effect of high value sensor capacitance and provides fast response time; the achieved bandwidth is high and due to current mode operation; the circuits enjoy the low-voltage low-power features. As signal-to-noise ratio is a crucial parameter in SiPMs interface circuit applications, here we consider the noise specifications and optimization of VCII-based SiPM interface circuits. The noise model of VCII is introduced and equivalent noise of a VCII-based interface circuit is derived. Methods to optimize trade-offs existing between key parameters including power consumption, gain and noise performance are discussed. Simulation results are also provided showing a considerable reduction of two orders of magnitude in most of the noise performances when compared to the previous work while preserving other performance parameters.

Automated summary

Recently, second generation voltage conveyor (VCII)-based transimpedance amplifiers (TIAs) have gained popularity in various applications, particularly in silicon photomultiplier (SiPMs) interfacing circuitry, due to their advantages such as low impedance, fast response, high bandwidth, and low power consumption. This study focuses on noise specifications and optimization of VCII-based SiPM interface circuits, introducing a noise model of VCII and discussing methods to optimize trade-offs between key parameters including power consumption, gain, and noise performance. Simulation results show a significant reduction in noise performance by two orders of magnitude compared to previous work, while maintaining other performance parameters.