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US 2011/0221526 A1Published application
Method and apparatus for a gain control circuit via a high frequency signal
OwnerRonald Quaninventor
Life of this patent
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Abstract
A gain control amplifier provides amplitude variation of an input signal that is coupled to the amplifier, by adding or combining a higher frequency signal that overdrives or distorts the amplifier to one or more degree(s), to provide the gain variation of the input signal. A predistortion circuit may be included to further reduce distortion of the input signal at the output of the amplifier.
Claims8
A method of varying the level of an input signal at the output of an amplifier, comprising:
- coupling the input signal to a first input of the amplifier;
- and
- coupling an external alternating current signal to a second input of the amplifier;
- wherein the external alternating current signal is varied in amplitude and or pulse-width to provide various degrees of harmonic and or intermodulation distortion for the external alternating current signal at the output of the amplifier, while substantially providing a varied amplitude of the input signal at the output of the amplifier, with substantially lower distortion of the input signal when compared to the distortion of the external alternating current signal.
1 more element
Apparatus for varying the level of an input signal comprising:
- an amplifier;
- a source of an input signal of a selected frequency or frequency spectrum;
- a source of an alternating current signal of a frequency higher than the frequency or frequency spectrum of the input signal;
- wherein the input signal and the alternating current signal are operatively supplied to the amplifier;
- and
- wherein the external alternating current signal is varied in amplitude and or pulse-width to provide various degrees of harmonic and or intermodulation distortion for the external alternating current signal at the output of the amplifier, while substantially providing a varied amplitude of the input signal at the output of the amplifier, with substantially lower distortion of the input signal when compared to the distortion of the external alternating current signal.
3 more elements
Dependencies are inferred from the claim text.