Loss control loop circuit for controlling the output voltage of

Details Loss control loop circuit for controlling the output voltage of Loss control loop circuit for controlling the output voltage of

1999-05-28

2000-10-24

Mis, David

Oscillators

Frequency stabilization

331 96, 331109, 331117R, 331183, 333 171, 333 172, 333 24R, H03B 500

Patent

active

061373753

ABSTRACT:
A circuit for controlling the loss of a VCO in a master-slave tuning system includes an envelope detector, an amplitude regulator, a current-mode circuit, and a low-pass filter. The envelope detector receives the VCO output voltage and provides VCO output envelope voltage, V.sub.ENV. The amplitude regulator receives V.sub.ENV and a reference voltage, V.sub.REF, and provides a sourcing current if V.sub.ENV is less than V.sub.REF, and draws a sinking current if V.sub.ENV is greater than V.sub.REF. The current-mode circuit receives V.sub.ENV and provides a control current, I.sub.Q. The low-pass filter has high DC gain for integrating the control current and the sourcing or sinking current to provide the VCO control voltage, V.sub.CON, to the VCO. The control current, I.sub.Q, is proportional to the inverse of V.sub.ENV multiplied by the time derivative of V.sub.ENV.

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