Multichannel cochlear implant with neural response telemetry

TLDR: In this paper, a circuit and method for cochlear implant telemetry where digital data is encoded into an RF signal was proposed, where the RF signal is applied via a rectifier diode to a first switch matrix S1 and a second switch matrices S2, with S1 being coupled to the first sampling capacitor C1 and S2 being coupled with the second sampling capacitance C2, and the comparator compares the first input to a DC reference voltage.

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