Phase-locked loop filter

Details Phase-locked loop filter Phase-locked loop filter

1980-02-01

1982-09-28

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

330107, 331 25, 333167, H03L 708

Patent

active

043520740

ABSTRACT:
A tunable narrow-band filter is described incorporating a phase-locked loop that includes a phase detector, amplifier, loop filter, and voltage controlled oscillator wherein the loop filter transfer function is derived or extracted from the desired closed-loop transfer function that is of order n=3 or greater. The loop filter may furthermore have finite transmission zeros or peak attenuation at specific frequencies close to the passband which also appear in the characteristics of the narrow-band filter.
The invention overcomes the problem of providing peak attenuation close to the passband of an electronically tunable narrow-band filter.

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