A micropower telemetry system with active electrodes

A PULSEWIDTH MODULATED telemetry transmittcr for medical applications has been designed to minimize power consumption and produce building blocks into integratable modules for multiple ehannel systems. The pulsewidth modulator also can be modified to perform a pulse position modulation function. The amplifier power consumption is 15 pW. The whole system requires 180 pW at 2.6 V. Hybrid as well as monolithic integrated circuitechniques were used to assemble the test models. Modulator blocks can be integrated into monolithic chips.