Preamplifier Reducing Kickback Noise for Full Differential Comparator

Abstract

This paper describes a preamplifier circuit of four inputs for full differential voltage comparator, which can compare directly the differential input signal voltage with the differential referential voltage. The problem of a preamp circuit is to occur kickback noise from output terminals to referential terminals through parasitic capacitance of MOS transistors. To suppress the kickback noise, we propose the full differential preamplifier circuit with the current mirror loads. The proposed circuit reduces the kickback noise to 1/10 to compare with a conventional full differential preamplifier circuit.