Sample and hold demodulator circuit
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United States of America Patent
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-
Jun 18, 2002
Grant Date -
N/A
app pub date -
Jun 30, 2000
filing date -
Oct 4, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In accordance with an embodiment of the invention there is provided a sample and hold demodulator circuit (200) for use in an automotive immobilizer to recover modulation information from a received modulated carrier signal (V.sub.RD). Sample and hold circuitry samples signals to recover the modulation information therein, and control circuitry (214) is coupled to the sample and hold circuitry for controlling operation thereof. The control circuitry includes shift register circuitry (252) for receiving a second received signal having a same frequency as a carrier frequency of the received modulated carrier signal and for producing at its outputs signals (SAMPLE, SAMPLE2, LATCH) for controlling operation of the sample and hold circuitry. The sample and hold demodulator circuit provides a single IC solution, allowing amplitude and phase demodulation to be performed with a single sample and hold circuit.
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