New type of push-push oscipliers for the frequency synthesizer

The authors describe the fundamental principles of novel voltage-controlled push-push oscipliers (oscillator/doubler) and show their application to a frequency synthesizer for L-band operation. The push-push oscipliers had 2 output ports. By means of a 0 degrees hybrid circuit, the external output power was obtained and the fundamental frequency was adequately suppressed at the same time. By applying the fundamental frequency, which was derived from a 180 degrees hybrid, to a prescaler of a phase-locked loop, the RF input power and the DC power consumption of the frequency synthesizer were reduced. The experimental frequency synthesizer had the advantages of high-frequency operation, compact size, and low power consumption.<>