LOCK PROOF OSCILLATOR CIRCUIT

摘要

PURPOSE: To hold the oscillation level of a tank circuit low and prevent interference with other circuits. CONSTITUTION: Three inverse conversion devices 38, 40, and 42 which are connected in series are fitted to the tank circuit 18 including inductances 12 and 13 and capacitance. Negative feedback from the 3rd inverse conversion device 42 to the 1st inverse conversion device 38 biases the inverse conversion device to an intermediate point between a bistable low and a high logical level state. Positive feedback from the second inverse conversion device 40 to the tank circuit induces the tank circuit to oscillate. The negative feedback is reduced and coupled at a resonance frequency and energy sent out of the positive feedback to the tank circuit maintains low-level oscillation of the tank circuit. Negative feedback around three inverse conversion device digital circuits prevents a lockup in case of power loss or temporary short-circuiting.