Oscillators – Single oscillator with plural output circuits
Patent
1996-06-21
2000-01-25
Mis, David
Oscillators
Single oscillator with plural output circuits
331 77, 331 96, 331116R, 331158, 455255, 455334, H03B 512, H03B 518, H03B 536
Patent
active
060182741
ABSTRACT:
The present invention relates to a radio receiver, particularly to a receiver for use in single-frequency applications, such as GPS, and to a frequency generator, which may be used in such a radio receiver, or elsewhere. The frequency generator comprises a tuned circuit connected between the emitter of the transistor and ground, such that a voltage signal at the basic frequency appears on the emitter terminal of the transistor. This arrangement has the advantage that the two frequencies appear on separate ports, and provides a radio receiver including radio receiver circuitry for connection to digital signal processing circuitry, reducing the complexity of the overall circuit. Additionally, there is a radio receiver wherein separate first and second local oscillator signals are generated from the terminal of s single transistor, avoiding the need for cascade multiplication stages, again reducing the size and complexity of the overall circuit. Further, circuitry is included generating an oscillator signal whereby the signal processing means tolerates the resulting frequency errors, and a single frequency direct downconversion receiver, comprising means for sub-sampling and one-bit coding the demodulated signal, and a transistor capable of decoding a microwave local oscillator signal and a digital signal processor with a clock signal for tolerating frequency errors.
REFERENCES:
patent: 2817761 (1957-12-01), Hollmann
patent: 3315180 (1967-04-01), Racy
patent: 4859969 (1989-08-01), Malinowski
patent: 5263197 (1993-11-01), Manjo et al.
Beach Mark A.
Mattos Philip G.
Carlson David V.
Galanthay Theodore E.
Mis David
STMicroelectronics Limited
University of Bristol
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