Voltage-controlled oscillator system.

摘要

A ceramic resonator (4), a variable reactance circuit (3), and a limiter circuit (6) are connected to the output of an amplifier (1) whose output is fed back to the positive phase-sequence input. The frequency of oscillation is controlled by varying an equivalent capacitance of the reactance circuit (3) with a control voltage (20) applied to the reactance circuit (3). The limiter circuit (6) ensures a variable frequency range on the high frequency side, and further the symmetry of the capture range when this system is applied to a PLL can be improved. <IMAGE>