Transconductance tuning circuit with independent frequency and amplitude control
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United States of America Patent
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Jan 7, 2003
Grant Date -
Jan 3, 2002
app pub date -
May 23, 2001
filing date -
May 30, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tuning circuit includes an oscillator that receives an oscillating input signal and a control signal, and generates an oscillating output signal. The control signal is obtained from a frequency control circuit that compares the phases of the oscillating output signal and a reference signal. The control signal controls the transconductance of a transconductance element in the oscillator, thereby controlling the oscillator output frequency. The oscillating input signal is obtained from an amplitude control circuit that detects an amplitude limit of the oscillator output. The oscillator output amplitude is responsive to the oscillating input signal. Frequency control and amplitude control in this tuning circuit are mutually independent, so their respective control loops remain stable under all frequency and amplitude combinations.
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