Temperature stable oscillator circuit apparatus

Details Temperature stable oscillator circuit apparatus Temperature stable oscillator circuit apparatus

1993-06-09

1994-08-23

Mis, David

Oscillators

Solid state active element oscillator

Transistors

331117R, 331158, 331176, H03B 512, H03B 536, H03L 102

Patent

active

053411129

ABSTRACT:
A stabilized oscillation circuit includes a bias circuit which controllably biases a bipolar-transistor-driven crystal oscillator circuit. The bipolar-transistor-driven crystal oscillator circuit is a modified version of a conventional transistor-driven oscillator, such as a Hartley, Pierce or Colpitts-type circuit. The bias circuit includes a first current providing a reference current through a Schottky diode and a pair of bipolar transistors. The bipolar-transistor-driven crystal oscillator circuit includes an input and an output, where the input of the bipolar-transistor-driven crystal oscillator circuit is coupled to the bias circuit. The bipolar-transistor-driven crystal oscillator circuit includes a second current through a second bipolar transistor. The second current tracks the reference current so that the output of the bipolar-transistor-driven oscillator circuit is substantially constant over variations in ambient temperature.

REFERENCES:
patent: 3831111 (1974-08-01), Lafferty
patent: 4048590 (1977-09-01), Dobberpuhl
patent: 4096452 (1978-06-01), Waku et al.
patent: 4152675 (1979-05-01), Jett, Jr.
patent: 4581593 (1986-04-01), Okanobu
patent: 4591807 (1986-05-01), Davis
patent: 4853654 (1989-08-01), Sakurai
patent: 5140286 (1992-08-01), Black et al.

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