A sensor interface is configured to receive a sensor signal. A transmitter modulates a first baseband signal responsive to the sensor signal so as to generate a transmit signal. A receiver demodulates a receive signal corresponding to the transmit signal so as to generate a second baseband signal corresponding...http://www.google.com/patents/US20030181798?utm_source=gb-gplus-sharePatent US20030181798 - Physiological measurement communications adapter
