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