G. Rohmer, J. Sauerer, D. Seitzer, U. Nowotny, B. Raynor, J. Schneider
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An 800 MSps track and hold using a 0.3 /spl mu/m AlGaAs-HEMT-technology
A feedforward T/H was developed as past of a 200 MSps/10 bit successive approximation ADC using a 0.3 /spl mu/m AlGaAs-HEMT process. This T/H is able to operate up to a clock frequency of 3 GHz and reaches a THD/spl ges/60 dB up to the Nyquist frequency of the ADC at the nominal clock frequency of 800 MHz. This was realized using a special circuit structure with a signal path and a reference path and a new diode bridge switch with an additional auxiliary bridge.
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