A GaAs BiFET sample and hold circuit has been implemented and evaluated. SINAD (signal to noise and distortion) was measured to be ~60dB, but was limited by the test setup. The device accepts a differential input and produces a differential output. The S/H is clocked differentially at rates of up to 200MHz. 12 bit performance was expected from SPICE simulations. Despite our test setup limitations. 10 bit performance was observed at 200MSPS with an input signal frequency of 198MHz.
- Field effect transistors
- Sample and hold circuits