Microwave oscillator using a transit time transistor

Details Microwave oscillator using a transit time transistor Microwave oscillator using a transit time transistor

1976-03-26

1977-07-05

Grimm, Siegfried H.

Oscillators

With distributed parameter resonator

330 12, 330 56, 331101, 331117D, 357 34, 357 57, H03B 518, H03B 912, H03F 355, H03F 360

Patent

active

040343120

ABSTRACT:
A microwave oscillator using a transit-time transistor structure with a space charge zone, is provided. The negative resistance introduced by the transit-time in the space charge zone is utilized in a circuit connected with emitter and collector, the base being direct-biased and not passing the high frequency. To avoid a short-circuiting by the parasitic base-collector capacitance, a transmission line is connected in parallel across the base and collector terminals. The input impedance of this line is adjusted by short-circuiting this line at a distance close to a quarter of wavelength, thus creating an input inductance able to compensate the effect of the base-collector capacitance.

REFERENCES:
patent: 3699475 (1972-10-01), Rogers
patent: 3946336 (1976-03-01), Froom et al.
Wright, "Efficiency of the Transistor Transit-Time Oscillator," Electronics Letters, May 31, 1968, vol. 4, pp. 217-219.

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