Automatic trimming of a controlled oscillator in a phase locked

Details Automatic trimming of a controlled oscillator in a phase locked Automatic trimming of a controlled oscillator in a phase locked

1996-12-02

1998-04-07

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 14, 331 16, 331 25, 331 34, 331 44, H03L 708

Patent

active

057369046

ABSTRACT:
A PLL circuit (401), including a VCO (420) having a trimming port (418) and a tuning port (416), a PLL controller (404), a variable voltage source (408), a voltage measuring circuit (426) and a multiplexer (412, 414, 428), performs automatic trimming of the VCO (420). The PLL circuit (401) accomplishes this by initiating a trimming mode that controls the multiplexer so that it couples the output of the PLL controller (404) to the trimming port (418), and the output of the variable voltage source (408) to the tuning port (416), thereby to phase lock the VCO (420) to the reference frequency signal (421). The PLL circuit (401) then measures, by way of the voltage measuring circuit (426), a voltage at the trimming port (418), switches the PLL circuit (401) to an operational mode, and then adjusts the variable voltage source (408) to be substantially equal to the voltage measured.

REFERENCES:
patent: 4896122 (1990-01-01), Tahernia et al.
patent: 4929918 (1990-05-01), Chung et al.

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