Oscillators – Solid state active element oscillator – Transistors
Patent
1987-08-26
1989-04-25
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331 75, 331158, 307261, H03B 536, H03K 508
Patent
active
048251780
ABSTRACT:
An oscillator with noise rejection which may be used in a gate array in a semiconductor chip including a first amplifier circuit, a circuit, for connecting an external feedback element (crystal) across the input and inverting output of the first amplifier circuit for generating and amplifying a sine wave, and a circuit connected to the inverting output of the first amplifier circuit for generating a square wave with the duty cycle thereof being proportional to the difference between the center of the voltage swing of the amplified sine wave and a reference voltage. In a preferred embodiment, the first amplifier circuit and the generating circuit each include a current switch. A voltage reference network is provided to set the reference voltage for the current switch in the generating circuit to the center of the voltage swing of the sine wave applied to that current switch. This results in a 50% duty cycle square wave for the output signal. A current source voltage reference is included for ensuring that each of the current switches and the voltage reference network drive approximately constant equal currents.
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Culican Edward F.
Davis John D.
Powell Martin E.
Pritzlaff, Jr. Philip E.
Ellis William T.
Grimm Siegfried H.
International Business Machines - Corporation
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