A 1-GSample/s, 15-GHz Input Bandwidth Master–Slave Track-and-Hold Amplifier in InP DHBT Technology

A fully differential master-slave track-and-hold amplifier is designed and fabricated in a 210-GHz-
f

_T
InP DHBT process. Input bandwidth of 15 GHz, total harmonic distortion lower than -39 dB and a third harmonic rejection greater than 45 dB are measured for 1 GSample/s and 4 dBm single-ended input signal. Time domain measurements demonstrate the performances of dual track-and-hold amplifier for Nyquist, over-sampling and sub-sampling conditions. Design tradeoff for master and slave blocks are presented. Experimental results obtained for different feed-through capacitors (
C

_FF
) show the effects of
C

_FF
on bandwidth and isolation.