STABILIZATION OF OSCILLATORS FOR A LOW POWER RADAR LEVEL TRANSMITTER

摘要

A low power pulsed radar level transmitter (100) has first and second pullable oscillator circuits (212,216) that are offset from one another by a frequency offset. A third or reference crystal oscillator (234) couples a reference frequency output to phase comparators (238,248) in both the first and second crystal oscillator circuits. The phase comparators adjust biases on varactor diodes (244,254) that pull the transmit and receive frequencies.