Harmonic phase locked loop with undesired DC component suppressi

Details Harmonic phase locked loop with undesired DC component suppressi Harmonic phase locked loop with undesired DC component suppressi

1979-07-09

1981-11-24

Moore, David K.

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

331 1A, 331 18, H03L 100

Patent

active

043027326

ABSTRACT:
The output signal of a voltage-controlled oscillator of a phase-locked loop has its phase compared with the phase of incoming data in a phase detector producing a first signal. This first signal is then passed through a non-inverting amplifier to produce an amplified signal of the same polarity. The first signal is also passed through an inverting amplifier otherwise similar to the non-inverting amplifier to produce an amplified signal of opposite polarity. The inverted and non-inverted amplified signals are then filtered in respective low pass filter circuits and combined differentially in an amplifier which produces an error voltage for the voltage-controlled oscillator. Differential combining of the inverted and non-inverted amplified signals eliminates undesired D.C. voltage components caused by temperature drifts and the like by mutually cancelling such components while effectively doubling the amplitude of the desired error voltage.

REFERENCES:
patent: 3886472 (1973-11-01), Cottatellucci
patent: 3921093 (1975-11-01), Lewis

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