The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 02, 1997
Filed:
Mar. 29, 1996
Donald R Kesner, Phoenix, AZ (US);
Bull HN Information Systems Inc., Billerica, MA (US);
Abstract
Compensation circuits are disclosed for correcting phase offset during apparent phase lock of a dual flip-flop phase detector type of phase locked loop, which phase offset is due to circuit delays in the phase detector. Simultaneous 'pump up' and 'pump down' signals, present even during apparent phase lock because of such circuit delays, are peak sampled through long lime constant filters and summed to derive a compensating signal which is applied to the reference input to the differential amplifier which controls the local oscillator, thereby exactly counteracting the offset component of the voltage appearing at the signal input to the differential amplifier which is developed during normal operation of the phase detector, filter and summing circuit of the phase locked loop at apparent phase lock.