Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1987-11-13
1989-03-07
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307262, 307254, H03K 1704, H03K 17687
Patent
active
048109126
ABSTRACT:
A current switch for use in digital-to-analog converters having high dynamic accuracy includes first and second electronic switches, the first of which connects either a constant-current source or a constant-current sink to an output terminal. The output terminal is connected to a low-pass filter. When the constant-current source is connected to the output terminal, the second switch connects the constant-current sink to a reference-voltage source. When the constant current sink is connected to the output terminal, the second electronic switch connects the constant current source to the reference-voltage terminal. This antiphase switching of the two electronic switches is controlled by a control circuit to which a clocked signal and a clock signal are applied. The clocked signal is, for example, a pulse-density-modulated signal which appears as a demodulated signal at the output of the low-pass filter. Switching is accomplished by limiting the swing of the control signals and using a control characteristic symmetrical with respect to the two switching edges.
REFERENCES:
patent: 3839679 (1974-10-01), Hughes
patent: 4228366 (1980-10-01), Huttemann et al.
patent: 4527133 (1985-07-01), Money
"IEEE Transactions on Industrial Electronics and Control Instrumentation", a Nonlinear Modulator Using Delta Modulation Principles, by Satish Mullick and D. R. Srivathsan, vol. 22, No. 3, Aug. 1975, pp.385-390.
1974 IEEE International Solid-State Circuits Conference, Feb. 14, 1974, "A Linear Delta Modulator/Demodulator with 10 Mbit/S Sampling Rate", Gary L. Baldwin.
"Digitale MOS-Technik", Mos-Integrierbare Digital-Analog-Wandler, Teil. Das Impulsdauerverfahren (Tastzeitverhaltnisverfahren), R. Reiner, pp. 180-184, No. 7, 1975.
O'Leary Paul
Theus Ulrich
Deutsche ITT Industries GmbH
Peterson Thomas L.
Zazworsky John
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