Design of DPSK modulator, demodulator and power telemetry for Epi-retinal and neural prostheses

The simulation of a DPSK modulator, demodulator and power telemetry for Epi-retinal and neural prostheses is presented in this paper. The technique adopted in this method is DPSK telemetry system with a 22 MHz input frequency. A quad level power telemetry system is to generate high and low voltage outputs to the stimulators. To add flexibility to the stimulator, each pixel has a local digital controller, which enables the stimulator IC to generate 256 parallel stimulations with various pulse widths and amplitudes. The proposed retinal stimulator circuit is designed in 180nm technology using cadence virtuoso analog design environment. The DPSK transmitter, DPSK receiver and power telemetry consumes 93.7μW, 98.3μW, 8.554μW respectively at 1.8V and area occupied for the transmitter and the telemetry is 0.00113mm2 and 0.000648 mm2.