Crystal oscillator circuit

Details Crystal oscillator circuit Crystal oscillator circuit

1995-06-13

1996-08-13

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

331116FE, H03B 536

Patent

active

055459412

ABSTRACT:
A crystal oscillator circuit including a quartz vibrator; an inverter circuit connected in parallel to the quartz vibrator and comprised of at least two transistors connected at their output ends to a first power-supply potential or a second power-supply potential lower than the first power-supply potential; a first current mirror circuit, with one current input-output end connected to a connection line with the inverter circuit of the first power-supply potential, the other current input-output end connected to the output end of the oscillator circuit; and either a second current mirror circuit having two current input-output ends, one current input-output end connected to a connection line with the inverter circuit of the second power-supply potential, the other current input-output end connected to the output end of the oscillator circuit, current flowing to one current input-output end, current flowing to the other current input-output end, and the level of the output end of the oscillator circuit being shifted to the level of the second power-supply potential when the output end of the inverter circuit is connected to the second power-supply potential or a circuit for shifting the level of the output end of the inverter circuit to the level of a second power-supply potential in accordance with the level of the input end of the inverter circuit when the output end of the circuit is connected to a second power-supply potential.

REFERENCES:
patent: 4346350 (1982-08-01), Morokawa et al.
patent: 4360789 (1982-11-01), Lewin et al.
patent: 4387349 (1983-06-01), Rapp
patent: 4459565 (1984-07-01), Leach
patent: 4710730 (1987-12-01), Doyle
patent: 4845444 (1989-08-01), Doyle
patent: 4956618 (1990-09-01), Ulmer
patent: 4965535 (1990-10-01), Neuman
patent: 5142251 (1992-08-01), Boomer
patent: 5208558 (1993-05-01), Shigehara et al.
patent: 5325074 (1994-06-01), Suenaga

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