JPS5550708A - Oscillation circuit - Google Patents

Abstract

PURPOSE: To obtain an arbitrary oscillation output by inserting the amplitude limiter to the positive feedback circuit and varying from the straight line region of the amplifier to the saturation region, in the oscillator with positive feedback to the amplifier.

CONSTITUTION: If the gain characteristics of the open loop is the curve 14 when the part between the terminals 6 and 7 is opened with the saturation characteristics of the amplitude limiter, the oscillation is made stable at the cross point 16 where the gain of the open loop is at 0dB. The amplifier 1 is completely operated at the straight line region with the operating point at the point 18 of the amplifier 1. Further, the saturation level of the amplitude limiter 13 is increased and the gain characteristics of the open loop is as shown in the curve 15, the oscillation is made stable at the cross point 17 and the power at the oscillator output is at the point 19. When the saturation level of the amplitude limiter 13 is further increased, the oscillation is made stable with the saturation characteristics of the amplifier 1. Accordingly, by changing the saturation level of the amplitude limiter 13, the operating point of the amplifier 1 can be selected at an arbitrary point between the straight line region to the saturation region to enable to remarkably vary the oscillated output power.

COPYRIGHT: (C)1980,JPO&Japio