Amplitude controlled sine wave oscillator
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United States of America Patent
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Feb 7, 1984
Grant Date -
N/A
app pub date -
Jun 3, 1980
filing date -
Dec 5, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An amplitude control circuit of the invention includes a vector composition circuit (18) for composing a cosine-wave signal (e3) from a sine-wave signal (e1) and a control signal generation circuit (20) for providing a control signal (e4) from the sine- and cosine-wave signals (e1, e3) which the control signal (e4) has substantially no ripples. DC level of the control signal (e4) is varied proportional to the amplitude of the sine-wave signal (e1) regardless of the frequency of the sine-wave signal (e1). The amplitude of an amplification control circuit (12) is controlled by the control signal (e4) so that the amplitude of the oscillation output signal (e1) derived from the oscillation circuit (16) is constant.
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