Methods and apparatus for automatic gain control
AssigneeHoneywell International Inc.
InventorsLeroy O. Thielman, Stanley A. White
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Abstract
An apparatus for controlling an amplitude of a signal generated from a digitized sinusoid of rapidly and widely varying amplitude is described herein. The apparatus includes a two stage gain adjuster which produces a gain adjusted signal, a phase shifter which converts the gain adjusted signal into two gain adjusted output signals separated in phase by 90 degrees, a power estimation unit to estimate the power of the gain adjusted signal, and an adjusting unit to adjust a gain of the gain adjuster according to a power estimate from the power estimation unit and a desired output signal power.
Claims41
An apparatus for controlling an amplitude of a signal generated from a digitized sinusoid of rapidly and widely varying amplitude, said apparatus comprising:
- a two stage gain adjuster which produces a gain adjusted signal;
- a phase shifter which converts the gain adjusted signal into two gain adjusted output signals separated in phase by 90 degrees;
- a power estimation unit to estimate the power of the gain adjusted signal;
- and
- an adjusting unit to adjust a gain of said gain adjuster according to a power estimate from said power estimation unit and a desired output signal power.
An apparatus for controlling an amplitude of a signal generated from a digitized sinusoid signal of rapidly and widely varying amplitude, said apparatus comprising:
- a two stage gain adjuster which produces a gain adjusted signal;
- an adaptive filter which filters the gain adjusted signal;
- a phase shifter which converts the filtered gain adjusted signal into two filtered gain adjusted output signals separated in phase by 90 degrees;
- a power estimation unit to estimate the power of the filtered gain adjusted signal;
- and
- an adjusting unit to adjust a gain of said gain adjuster according to a power estimate from said power estimation unit and a desired output signal power.
A method for controlling the amplitude of a signal generated from a digitized sinusoid signal of rapidly and widely varying amplitude, said method comprising:
- producing a gain adjusted signal from the sinusoid utilizing a two stage gain adjuster;
- converting the gain adjusted signal into two gain adjusted output signals separated in phase by 90 degrees utilizing a phase shifter;
- estimating the power of the gain adjusted signal;
- and
- adjusting the gain of the gain adjuster according to the estimated power and a desired output signal power.
A control circuit for a gyro comprising:
- a phase-locked loop (PLL) configured to supply a motor control signal, said PLL further comprising:
- an analog-to-digital converter (ADC) configured to receive a gyro pick-off signal;
- an automatic gain control (AGC) circuit to provide amplitude control to an output of said ADC;
- and
- a numerically controlled digital dual frequency oscillator;
- and
- a motor signal conditioner which converts the motor control signal to an analog motor drive signal.
A control circuit according to claim 41 wherein said two stage gain adjuster comprises:
- a first stage configured to provide coarse gain changes;
- and
- a second stage configured to provide fine gain changes.
Dependencies are inferred from the claim text.