Method and apparatus for controlling oscillator duty cycle

A controller circuit adjusts the output signal duty cycle of an oscillator circuit. The controller circuit changes the effective bias voltage of an amplifier in a Pierce oscillator by enabling a sequence of transistor stages. Changes to the amplifier bias voltage proportionally alter the duty cycle...

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Bibliographic Details
Main Author BADYAL; RAJEEV
Format Patent
LanguageEnglish
Published 02.01.1996
Edition6
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
GENERATION OF NOISE BY SUCH CIRCUITS
GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER
PULSE TECHNIQUE
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Summary:A controller circuit adjusts the output signal duty cycle of an oscillator circuit. The controller circuit changes the effective bias voltage of an amplifier in a Pierce oscillator by enabling a sequence of transistor stages. Changes to the amplifier bias voltage proportionally alter the duty cycle of the oscillator output signal. Each transistor stage includes a first and second transistor selectively coupled in parallel with the amplifier. Each transistor in the circuit has smaller process parameters than the amplifier transistors so that the amplifier bias voltage can be incrementally increased or decreased to produce an output signal with a high precision duty cycle.
Bibliography:Application Number: US19930138276