Analog phase-locked loop including voltage regulator

Details Analog phase-locked loop including voltage regulator Analog phase-locked loop including voltage regulator

1997-12-19

1999-09-28

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 17, 331 25, 331 57, H03L 7093

Patent

active

059595027

ABSTRACT:
An integrated circuit (100) includes an analog phase-locked loop circuit (10) and other circuitry (102). The integrated circuit (100) has a plurality of external connection pins (104, 106), which are coupled to the other circuitry. The analog phase-locked loop circuit (10) is free of connections to the external connection pins. The analog phase-locked loop circuit (10) 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) and a regulated supply voltage (VREG).

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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