Controllable effective resistance and phase lock loop with contr

Details Controllable effective resistance and phase lock loop with contr Controllable effective resistance and phase lock loop with contr

1984-12-17

1986-08-26

Laroche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 17, 331132, 333217, H03L 706, H03H 744

Patent

active

046085432

ABSTRACT:
Disclosed is a circuit providing a controllable effective resistance which comprises of transistor means that provides current at an input node responsive to an input voltage at the input node. The transistor means is coupled to a settable current source which operates to control the effective value of the controllable effective resistance. The invention also includes a filter which employs the controllable effective resistance to vary the breakpoint frequency of the filter. Also, a phase-locked loop apparatus employing the filter is disclosed.

REFERENCES:
patent: 3739195 (1973-06-01), Fidi et al.
patent: 3965441 (1976-06-01), Roy et al.
patent: 4433308 (1984-02-01), Hirata
Surakampontorn, W., "Wide-Band Voltage Controlled and Current-Controlled Resistance Circuits", Int. J. Electronics, Feb. 1981, vol. 50, No. 2, pp. 149-152.

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