U.S. Philips Corporation

Georg Lutteke

Wilhelmus A Zwijsen

Gerd Schiefer

Klaus Lohn

Karel Petrus Rooij

Paulus Petrus Groenewegen

Hans Viktor Weinerth

Lammert Bruntink

A push-pull microwave oscillator circuit, including two transistors, for producing the second harmonic of a fundamental frequency at a symmetry point of the circuit which is connected to the bases of the transistors through identical arrangements of circuit elements. The circuit includes tuning means coupled to at least one of the transistors, an output and an input. The output, which is utilized to provide to a phase comparison means an output signal at the fundamental of the second harmonic frequency, is coupled to the base of at least one of the transistors by a capacitive impedance. The input, which is utilized to receive a tuning signal produced by the phase comparison means in response to the output signal, is coupled to the tuning means.

Push-pull microwave oscillator with fundamental and second harmonic

The IC television tuner has a tunable oscillator and a fixed oscillator, two mixer stages and a filter in between. This tuner operates at two intermediate frequencies the first of which lies in the GHz range. The two oscillators are coupled through hybrid rings.

Tunable high frequency input circuit for a television receiver that

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Aachen, Germany

Georg Lutteke