Abstract
This paper presents a capacitor cross-coupled gm-boosting scheme for differential implementation of common-gate transimpedance amplifier (CG-TIA). A differential transimpedance amplifiers (DTIA) is designed by this scheme using two modified floating-biased CG stage with improved low corner frequency. Despite conventional methods for single-ended to differential conversion that increase the power and the noise for the same gain, the new DTIA gives a higher gain and hence reduces the input-referred noise power. Design of the DTIA circuit using 0.13μm CMOS technology illustrates near 1.7dB improvement in the circuit sensitivity and 5.2dB enhancement in transimpedance gain compared to its single-ended counterpart. Operation at very low frequencies and stable dc coupling to photodiode are other features of the proposed DTIA.
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