The InnovationQ application will be updated on Sunday, May 31st from 10am-noon ET. You may experience brief service interruptions during that time.
Browse Prior Art Database

Precision Phase and Frequency Discriminator

IP.com Disclosure Number: IPCOM000040035D
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue


Related People

Lee, ACF [+details]


A phase, frequency discriminator is disclosed for controlling an oscillator with minimum phase jitter, high speed locking to a reference signal and locking from any initial frequency. Two falling edge detectors are used, the output of each inhibiting the output of the other, thereby improving phase and frequency control by removing delays in reset circuitry from the control path, and preventing glitches in the output when a reset is occurring. The logic for the phase/frequency discriminator is shown in Fig. 1. The circuit consists of two falling edge detectors, reset logic, and switching logic to prevent glitches on reset and inhibit the outputs.