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Entwurf und Charakterisierung schneller GaAs-Abtasthalteglieder hoher Genauigkeit

: Rohmer, G.

Erlangen, 1995, 146 pp. : Ill.
Erlangen-Nürnberg, Univ., Diss., 1995
Fraunhofer IIS A ( IIS) ()
Abtasthalteglied; ADC; ADU; Analog-Digital-Umsetzer; analog-to-digital-converter; Gallium Arsenid; gallium arsenide; HEMT; sample and hold; track and hold

A feedforward T/H was developed as part of a 100 MSps / 10 bit successive approximation ADC using a 0.3 mu m AlGaAs-HEMT process. This T/H is able to operate up to a clock frequency of 3 GHz and reaches a THD >= 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.