Convertible oscillator circuit

Details Convertible oscillator circuit Convertible oscillator circuit

1992-09-18

1994-05-10

Mis, David

Oscillators

Convertible

331111, 331143, 331153, 3072723, 307276, H03K 326, H03B 524

Patent

active

053111508

ABSTRACT:
An integrated oscillator includes an amplifier having first and second voltage inputs, and first and second current outputs, and a current mirror having an input coupled to the second current output of the amplifier and an output coupled to the first current output of the amplifier. The output of the current mirror and the first current output of the amplifier are coupled through a bonding pad to an external capacitor. A first comparator has a first input coupled to the first current output of the amplifier and a second input for receiving a first threshold voltage, and a second comparator has a first input coupled to the first current output of the amplifier and a second input for receiving a second threshold voltage. A flip-flop has a first input coupled to the output of the first comparator, a second input, and an output coupled to the second voltage input of the amplifier. A first multiplexer has a first input for receiving a reference voltage, a second input coupled to the output of the second comparator, and an output coupled to the first voltage input of the amplifier. A second multiplexer has a first input coupled to the output of the second comparator, a second input for receiving an enable signal, and an output coupled to the second input of the flip-flop. The output of the second comparator forms a one-shot output node responsive to the enable signal, and the output of the flip-flop forms a free-running oscillator output node.

REFERENCES:
patent: 3500229 (1970-03-01), Haggan
"Linear Databook", National Semiconductor Corporation, pp. 9-33 to 9-38.
Abandoned, unpublished, in-house invention of David McNeill dated Oct. 25, 1985.

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