TIME-BASED HYBRID ANALOG-DIGITAL COMPUTATION Rahul Sarpeshkar Assistant Professor MIT Electrical Engineering and Computer Science Media Lab 6/28/02

THE HYBRID STATE MACHINE (HSM) FINITE STATE MACHINE HYBRID STATE MACHINE (HSM) “Spike” = Pulse or Digital Event

An HSM for Successive Approximation A/D Conversion .

Analog Memory Element Input Voltage (V) Time (s) 13mV drift Stored Voltage (V) 8 bit-precise storage characteristic 8 bit-precise write characteristic Output Voltage (V) Input Voltage (V) Time (s) Uses a clock to do signal restoration without explicit quantization on voltage Information that has been first converted to time. When time is a signal variable, a clock is a powerful tool for quantization since you round up or round down to the nearest clock edge.