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:
Dec. 24, 1991
Filed:
Dec. 26, 1990
David C Babin, Austin, TX (US);
John D Hatchett, Scottsdale, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A synthesizer is placed in standby mode when a standby portion of a control register is set. Once standby is activated, any detectors and counters are inhibited. The inputs and outputs are reconfigured so as to minimize current drain and to stabilize the VCO control voltage. Recovery from standby is accomplished in two phases. The first phase is started by the receipt of a terminate standby signal. This enables the inputs and starts the counters. The second phase is activated when a signal is received from a feedback counter indicating it has completed a cycle. This causes the preset data to be loaded into the reference counter. The counters are then synchronized; the detector is initialized; and the detector output is enabled. The device also controls an output lock detector and reference frequency signal during the standby mode. The system is also compatible with variable modulus prescalers.