Push-push oscillator using a transmission line resonator and dif

Details Push-push oscillator using a transmission line resonator and dif Push-push oscillator using a transmission line resonator and dif

1991-06-27

1992-08-11

Grimm, Siegfried H.

Oscillators

Plural oscillators

Parallel connected

331100, 331117D, H03B 518

Patent

active

051382849

ABSTRACT:
A push-push oscillator comprises: a resonator having a transmission line and a capacitance connected to the transmission line in parallel; an oscillator for producing two outputs having an antiphase relation therebetween in response to the resonator; and a differential signal producing circuit for producing a differential signal in accordance with difference between these two outputs. These outputs can be obtained from the resonator. The transmission lines comprise strip line or microstrip line which is curved to form an open loop. The transmission line may be made of a dielectric material and is curved to form an open loop whose both ends are connected to a capacitance. The resonator may further comprise two second transmission lines, each provided to an end of the transmission line, these two second transmission lines facing each other with a given distance therebetween, the distance and length of the second transmission lines being determined such that necessary capacitance is provided. Impedance of each portion of the resonator is determined to miniaturize the resonator. The differential signal producing circuit comprises a balanced to unbalanced converting circuit.

REFERENCES:
patent: 4249149 (1981-02-01), Diamand et al.
patent: 4527130 (1985-07-01), Lutteke
patent: 4749963 (1988-06-01), Makimoto et al.
patent: 4763084 (1988-08-01), Pavio, Jr. et al.
patent: 4783638 (1988-11-01), Mamodaly et al.
Wong, "Microstrip Tapped-Line Filter Design" IEEE Transactions on Microwave Theory and Techniques, vol. MTT-27, No. 1, Jan. 1979, pp. 44-50.
Nativ et al, "Push-Push VCO Design with CAD Tools", Microwave Journal, Feb. 1989, pp. 127-132.

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