Gm-boosted differential transimpedance amplifier architecture

Abstract

A modified floating biased common-gate transimpedance amplifier with improved low corner frequency is introduced. It is also shown that g m-boosting technique can be utilized for differential implementation of this transimpedance amplifier, without degrading the circuit sensitivity or using any off-chip components. HSPICE simulations for differential implementation illustrate more than two orders of magnitudes improvement of low corner frequency, about 80% increase in gain, and 20% reduction in input referred noise, compared to those of conventional single-ended floating biased common gate transimpedance amplifier. © IEICE 2007.