MULTICHANNEL COCHLEAR IMPLANT WITH NEURAL RESPONSE TELEMETRY

摘要

A circuit and method for cochlear implant telemetry where digital data isencoded into an RF signal. The RF signalis applied via a rectifier diode to a first switch matrix S1 and a secondswitch matrix S2, with S1 being coupled to a first samplingcapacitor C1 and S2 being coupled to a second sampling capacitor C2. A localoscillator signal with period T is applied that controlsS1 and S2, cyclically coupling C1 and C2 to the RF signal, a first input to acomparator, and ground. The comparator compares thefirst input to a DC reference voltage. The output of the comparator is thensampled via a flip flop clocked by the local oscillator,with the flip flop outputting a data bit stream representative of the envelopeof the RF signal having encoded information.