Oscillators – Solid state active element oscillator – Transistors
Patent
1979-05-29
1981-08-11
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331158, H03B 536
Patent
active
042836913
ABSTRACT:
A method and apparatus for minimizing the noise component of the output signal from a resonator oscillator. A single transistor or Darlington pair of transistors in the common base configuration is placed in series with the crystal resonator of the oscillator with a selected output load impedance connected between the base and collector of the transistors. By making use of this configuration, it is possible to use the crystal resonator as an initial filter to minimize the noise component of the output signal contributed by the oscillator loop as well as minimizing the inherent noise component from the output buffer amplifiers in the output signal. A common base configuration of both of these embodiments provides a low impedance load on the oscillator loop thus minimizing the effect on tuning or Q of the oscillator while making it possible to select an output impedance load that is of sufficient size to present an output signal having a sufficiently high signal to noise ratio to provide the minimization sought.
REFERENCES:
patent: 2745010 (1956-05-01), Stansel
patent: 3743968 (1973-07-01), Miyake et al.
patent: 3803828 (1974-04-01), Keeler et al.
patent: 3916344 (1975-10-01), Enderby
Grimm Siegfried H.
Hewlett--Packard Company
Jones Allston L.
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