A 10-GSamples/s track and hold amplifier using reference current source unaffected by temperature in 0.18µm SiGe BiCMOS technology

Abstract

This paper presents design and simulation of a track and hold amplifier(THA) and a temperature independent reference current circuit for high speed analog digital converter in 0.18pm SiGe BiCMOS process BCS180G of HHNEC. The THAs circuit is based on the switched emitter follower topology. Therewithal, the reference current source circuit consists of a proportional to absolute temperature(PTAT) and complementary to absolute temperature(CTAT) circuits. The reference current source unaffected by temperature is working with an accuracy of %0.4 between -45 °C and 120 °C. Respectively, the power supply voltage of the designed THAs circuits and temperature independent reference current circuit is 5V and 3.3V. The active layout area of designed circuit is 0.02534mm2(132pm x 192pm), consuming 465mW at 10GS/s sampling rate.