Precision Phase and Frequency Discriminator
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01
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.