Local clock duty cycle independent phase detector and method of

Details Local clock duty cycle independent phase detector and method of Local clock duty cycle independent phase detector and method of

1996-12-11

1998-06-23

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 331 27, 327 7, 327 12, 327157, 327159, H03L 7089, H03L 7093

Patent

active

057709769

ABSTRACT:
A phase detector for a phase-locked loop ("PLL") circuit under control of a local oscillating clock ("LOSC") signal and a method of operation thereof. The phase detector includes: (1) a first circuit that receives a reference data ("REF") signal and the LOSC signal and develops therefrom an up pulse and a delayed data signal, (2) a second circuit, having an input coupled to an output of the first circuit, that receives the delayed data signal and the LOSC signal and develops therefrom at least one down pulse, a period of the at least one down pulse being substantially equal to a period of the LOSC signal and (3) a charge pump, having a predetermined up current setting and a predetermined down current setting, the predetermined down current setting being different from the up current setting to compensate for the period of the at least one down pulse, that receives the up pulse and the at least one down pulse and develops therefrom a voltage-controlled oscillator ("VCO") drive signal, the period of the at least one down pulse being substantially equal to the period of the LOSC signal to render the VCO drive signal less sensitive to variations in LOSC signal duty cycle.

REFERENCES:
patent: 4422176 (1983-12-01), Summers
patent: 5027085 (1991-06-01), DeVito
patent: 5432480 (1995-07-01), Popescu
patent: 5534821 (1996-07-01), Akiyama et al.
patent: 5546052 (1996-08-01), Austin et al.

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