Oscillators – With distributed parameter resonator – Parallel wire type
Patent
1990-03-14
1991-02-05
Grimm, Siegfried H.
Oscillators
With distributed parameter resonator
Parallel wire type
331117D, 331177V, 331181, H03B 512, H03B 518
Patent
active
049908669
ABSTRACT:
A tuning circuit (4) for a VCO includes a coarse tuning section (6) and a fine tuning section (7). The coarse tuning section includes three varactors (13, 14, 15) connected in series. These varactors together with their housings are designed to operate at considerably lower frequencies than the VCO, so that they behave as inductances at the VCO frequency. A capacitance (16) connected in parallel with the varactor inductances forms a resonant circuit therewith and serves to widen the tuning band of the VCO in adjustable manner. A capacitance (17) connected between the coarse and fine tuning sections adjusts the central oscillation frequency. An adjustable transmission line (12) in the fine tuning section adjusts fine tuning sensitivity.
REFERENCES:
patent: 4598423 (1986-07-01), Hettiger
patent: 4684904 (1987-08-01), Watkins et al.
patent: 4736169 (1988-04-01), Weaver et al.
Schaffner, "Put the Varactor's Inductance to Use", Electronic Design, vol. 21, Oct. 11, 1967, pp. 78-82.
Microwave Journal, vol. 30, No. 5, May 1987, pp. 347-348, 350, 352-353, Norwood, Mass., US; J. Kitchen: "Octove Bandwidth Varactor-Tuned Oscillators", (p. 47, paragraph: Varactor Diodes.
ALCATEL N.V.
Grimm Siegfried H.
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