Power supply noise compensation for a high frequency phase detec

Details Power supply noise compensation for a high frequency phase detec Power supply noise compensation for a high frequency phase detec

1988-12-19

1991-04-30

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307542, 328155, H03K 301, H03K 500

Patent

active

050121316

ABSTRACT:
A phase detector circuit which compensates for unwanted variations induced in an input signal by the operation of a thresholding input circuit such as a frequency divider. The circuit monitors the level of a supply voltage used by the input circuit to provide a supply variation signal indicative of such unwanted variations. The supply variation signal is then used to correct the output of the input circuit. In one embodiment that compensates for noise in the output of a digital frequency divider used as an input circuit in a high frequency phase detector, a high-pass filter and amplifier detect the supply variations. The supply variation signal is then fed to a phase adjustment circuit which compensates for the variations in supply voltage by adjusting the conduction threshold of a differential transistor pair. A variable impedance can be arranged to optimally attenuate the supply variation signal, thereby obtaining maximum noise elimination at a given operation frequency. The invention can be useful wherever an input signal is compared against a threshold voltage.

REFERENCES:
patent: 3171982 (1965-03-01), Ruhland
patent: 3484702 (1969-12-01), Moore
patent: 3612917 (1971-10-01), Sutcliffe et al.
patent: 3622864 (1971-11-01), Claps et al.
patent: 3673430 (1972-06-01), Donoghue

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