Controlled gain amplifier with variable control exponent

Details Controlled gain amplifier with variable control exponent Controlled gain amplifier with variable control exponent

1998-07-22

2000-02-29

Lee, Benny

Amplifiers

Modulator-demodulator-type amplifier

330251, H03F 338

Patent

active

060314214

ABSTRACT:
A controlled-gain amplifier has a gain control port responsive to a control voltage Vc, and produces a gain proportional to Vc raised to a fixed or continuously variable power X, such that gain=K(Vc).sup.X, where K is a constant. Precise gain control is achieved through the use of pulse width modulation (PWM) control of cascaded amplifier stages. A PWM regulator linearly controls the gain of each amplifier stage, and multiple stages are cascaded for (Vc).sup.N gain control, where N is an integer. One or more amplifier stages may contain a variable low pass filter that allows continuous control of the control exponent to produce non-integer exponents. The circuit can be used as a Sensitivity-Time-Control (STC) circuit in sampling-type radar systems, or in ultrasonic rangefinders, where the gain of the receiver needs to increase exponentially with increasing range.

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