Demodulator for ask-modulated signals having small modulation depth
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United States of America Patent
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Jul 3, 2001
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N/A
app pub date -
Dec 15, 1999
filing date -
Dec 16, 1998
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Abstract
A demodulator circuit for demodulating a signal ASK-modulated with modulation pulses equal in duration, and having a small depth of modulation and large dynamic range comprises an amplitude limiter (10) through which an amplitude-dependent current flows when the amplitude of the signal to be demodulated exceeds its limiting threshold value. Furthermore comprised is an envelope detector (12) to the input of which the signal to be demodulated is applied, as well as a differentiating network (14) configured so that it differentiates the output signal of the envelope detector (12) and outputs a signal pulse only when the change in amplitude of this output signal is in one direction. A bandpass filter (18) in the demodulator circuit passes, from a signal derived from an amplitude-dependent current from the amplitude limiter (10), the frequency component attributed to the duration of the modulation pulses. A comparator (20) compares the output signal of the bandpass filter (18) to a fixed threshold value and outputs a signal pulse when this output signal exceeds the threshold value. A logic circuit (15) outputs the signal pulse existing in each case as the demodulated signal.
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