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Browse Prior Art Database

FREQUENCY ACQUISITION DETECTOR AND TRANSMITTER INHIBITOR CIRCUIT

IP.com Disclosure Number: IPCOM000006293D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2001-Dec-20

Publishing Venue

Motorola

Related People

Authors:
Armando J. Gonzalez Cesar Carralero Jaime A. Borra

Abstract

In the event of malfunction in a radio frequency phase locked loop (PLL), the radio frequency emissions created by the PLL will be uncontrolled. This uncon- trolled RF emissions could interfere with other radio frequency users anywhere in the RF spectrum. This sce- nario reveals the need for a circuit which must accom- plish two objectives. The circuit must be able to sense a PLL malfunction and respond to this PLL operating sta- tus by suppressing all radio frequency emissions.