Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1987-04-21
1988-11-15
Laroche, Eugene R.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307521, H03K 500, H04B 110
Patent
active
047852534
ABSTRACT:
An integrated electrical filter includes resistors (R10-12) and capacitors (C10-12). The capacitors are controllable in value by means of a control circuit (100-109) and are formed by a binary weighted array of capacitor elements which are selectively connectable in parallel. A controlled oscillator (103) or a controlled phase shifting network (113) includes a capacitor of the same form as the filter capacitors. The oscillator (103) or phase shifter (113) form part of a phase locked loop (101, 104, 105, 107) which produces a digital code as its control signal at the output of an up/down counter (107). This digital code is latched in a register (109) to provide a control signal for the filter capacitors and also is used directly to control the capacitor(s) in the controlled oscillator or phase shifter.
REFERENCES:
patent: 4185246 (1980-01-01), Schroeder
patent: 4691171 (1987-09-01), Van Roermund et al.
Moulding, Kenneth W., et al., "Gyrator Video Filter IC with Automatic Tuning", IEEE J. S. S. ekts., v. sc-15, n. 6, 12-80, pp. 963-967.
Banu, Mihai and Tsividis, Yannis, "On-Chip Automatic Tuning for a CMOS Continuous Time Filter", ISSCC8S, pp. 286-287.
Franzblau Bernard
LaRoche Eugene R.
Mottola Steven J.
U.S. Philips Corporation
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