Title:
INTERACTING OSCILLATOR AND FREQUENCY DISCRIMINATOR WITH A COMMON RESONATOR OR TIME DELAY UNIT
Document Type and Number:
WIPO Patent Application WO1999048209
Kind Code:
A3
Abstract:
An oscillator (1) is stabilized by a frequency discriminator in order to reduce its phase noise. A microwave amplifier (4) supplies sufficient power to maintain the oscillation. The oscillator and the frequency discriminator use a common resonator or time delay unit (6). A pair of directional couplers (9, 11) deflect a little of the microwave incident upon the resonator (6) and a little of the microwave transmitted by the resonator. Resistors (12, 13) terminate the unconnected ports of the directional couplers. A fixed phase rotator (14) compensates for the longer route of one deflected microwave. A frequency discriminator signal (18) is generated by phase comparison (15), base-band amplification (16) and filtering (17) of the deflected and phase-compensated microwaves. The frequency discriminator signal controls the phase in the oscillator by means of, for example, a controllable phase rotator (2). In this connection, a control system which measures and corrects the phase error in the oscillator is obtained.
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Inventors:
ANDERSSON STEFAN (SE)
Application Number:
PCT/SE1999/000245
Publication Date:
November 25, 1999
Filing Date:
February 23, 1999
Export Citation:
Assignee:
CELSIUSTECH ELECTRONICS AB (SE)
ANDERSSON STEFAN (SE)
ANDERSSON STEFAN (SE)
International Classes:
H03B5/18; H03L1/02; (IPC1-7): H03L7/00
Foreign References:
| US5661439A | 1997-08-26 | |||
| EP0044153A1 | 1982-01-20 | |||
| US5036299A | 1991-07-30 | |||
| US5204640A | 1993-04-20 | |||
| DE3040793A1 | 1982-05-13 | |||
| US5032800A | 1991-07-16 | |||
| US4553110A | 1985-11-12 |
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