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

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

4. An HSM for Successive Approximation A/D Conversion.

5. 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.