A linear transconductance amplifier with differential-mode bandwidth extension and common-mode compensation

Abstract

A transconductance amplifier with extended bandwidth, which is a critical block in various applications including amplifiers, filters and DACs, is presented. The presented technique introduces a differential-mode negative capacitance while introduces the common-mode positive capacitance such that it extends the differential-mode bandwidth and compensates the common-mode stability. The proposed transconductance amplifier has been implemented for a DAC in CMOS 20nm to improve the distortion performance as a negative transconductance circuit, but the proposed technique is applicable to the wide range of circuits with a transconductor.