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A Gigasample/s 5 bit ADC with on-chip track & hold based on an industrial 1 mu m GaAs MESFET E/D process



Institute of Electrical and Electronics Engineers -IEEE-:
13th Annual GaAs IC Symposium 1991. Technical digest
New York/N.Y.: IEEE, 1991
ISBN: 0-7803-0196-X
ISBN: 0-7803-0197-8
ISBN: 0-7803-0198-6
GaAs IC Symposium <13, 1991, Monterey/Calif.>
Conference Paper
Fraunhofer IIS A ( IIS) ()
Abtasthalteglied; ADC; ADU; Analog-Digital-Umsetzer; analog-to-digital-converter; Gallium Arsenid; gallium arsenide; MESFET; T&H; track and hold circuit

To enhance the dynamic accuracy of high speed A/D conversion, a 5 bit flash converter with on-chip Track & Hold circuitry has been developed. The design is based on TriQuint's commercial 1 mu m GaAs E/D MESFET process. Dynamic characterization has been performed up to 1 Gsps. An accuracy of 4.4 effective bits even at 1 GSps with full Nyquist input was achieved. A comparison showing the accuracy with Track & Hold in operation and in tracking only mode is given. The outstanding performance is due to a carefully designed Track & Hold and the use of differential SCFL in the converter.