A wideband transimpedance amplifier with tee network topology

Abstract

In this paper, a wideband transimpedance amplifier (TIA) was proposed for high speed optical receiver chips. The proposed TIA replaces feedback resistance in conventional design with a kind of tee network circuit. Consequently, the bandwidth (BW) and phase margin (PM) of TIA are enhanced significantly. Besides, cascade current mirror was also used for improving power supply rejection ratio (PSRR). This wideband TIA was designed in standard 0.35 CMOS technology. Simulation results show that the proposed TIA has a bandwidth of 145 MHz, low frequency transimpedance gain of 93 $\mathrm{dB}\Omega$, phase margin of more than 66° and low frequency power supply rejection ratio (PSRR) of $-157dB$. And the average input referred noise current spectral density is 6. $8\mathrm{pA}/\sqrt{\mathrm{H}\mathrm{Z}}$ from DC to 500 MHz. The TIA we designed dissipates only 3.5 $\mathrm{mW}$ with a 3.3 V power supply.