Voltage regulator circuit and phase-locked loop using same

Details Voltage regulator circuit and phase-locked loop using same Voltage regulator circuit and phase-locked loop using same

1997-12-19

1999-09-07

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 17, 331 25, 323315, 327541, 327543, G05F 316, H03L 7093

Patent

active

059492899

ABSTRACT:
An integrated circuit (100) includes an analog phase-locked loop circuit (10) and other circuitry (102). The analog phase-locked loop circuit includes a phase detector circuit (16) which compares the phase of a reference signal (28) to the output (12) of the phase-locked loop circuit, a charge pump circuit (18) responsive to the phase detector for varying the charge on a capacitor (36) of a loop filter circuit (20), a regulator circuit (22) which receives two separate control voltages (38, 44) from the loop filter circuit, and a voltage controlled oscillator circuit (24) which receives from the regulator circuit two separate control voltages (VIN, VREG), one of which also serves as a regulated supply voltage. The regulator circuit includes n-channel devices which are connected in series between a supply voltage and each control voltage output.

REFERENCES:
patent: 4935941 (1990-06-01), Jones
patent: 5604466 (1997-02-01), Dreps et al.
patent: 5650754 (1997-07-01), Joshi et al.

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