Demodulation and regulation concept for IR receivers
AssigneeATMEL Germany GmbH
InventorAlexander Kurz
Life of this patent
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Abstract
A method and circuit for amplifying and demodulating amplitude-modulated signals is disclosed that amplifies a primary signal into an amplified signal, bandpass filters the amplified signal into a filtered signal, compares the filtered signal with a regulation threshold and regulates the gain of the primary signal such that peak values of the filtered signal approach the regulation threshold, compares the filtered signal with a signal threshold, and demodulates the result of the comparison. Whereby a value of the signal threshold is smaller than a value of the regulation threshold.
Claims12
A method for amplifying and demodulating amplitude-modulated signals, the method comprising the steps of:
- amplifying a primary signal into an amplified signal;
- bandpass filtering of the amplified signal into a filtered signal;
- comparing the filtered signal with a regulation threshold;
- regulating a gain of the primary signal such that peak values of the filtered signal approach the regulation threshold;
- comparing the filtered signal with a signal threshold, a value of the signal threshold being smaller than a value of the regulation threshold;
- and
- demodulating a result of the comparison.
A circuit for processing amplitude-modulated signals, the circuit comprising:
- an amplifier that provides an amplified signal from a primary signal;
- a bandpass filter that provides a filtered signal from the amplified signal;
- a regulation comparator that compares the filtered signal with a regulation threshold;
- a regulator that regulates a gain of the amplifier such that peak values of the filtered signal approach the regulation threshold;
- a signal comparator that compares the filtered signal with a signal threshold a value of the signal threshold being smaller than a value of the regulation threshold;
- and
- a demodulator that demodulates a result of the comparison.
Dependencies are inferred from the claim text.