Cambridge Massachusetts Analog Logic Ben Vigoda Analog Logic

Cambridge, Massachusetts Analog Logic Ben Vigoda

Analog Logic • Combine Efficiency of Analog Device Physics – 10 -100 x Less Power – 10 x Less Area / Cost – Higher Performance • With Scalability of Computing Digitally – Modular, Hierarchical for Automated Design Synthesis – Relatively Invariant to Fabrication Process 2

From Digital Logic Gates to Analog Logic Gates Probability Inverter Digital Inverter in Digital XOR 3 out in out 0 1 1 0 in, x out, y Probabilistic XOR

Analog Logic: implement many statistical estimation and signal processing algorithms natively using analog “gates” Demodulation, Equalization Filtering and Control Compute probabilities for millions of variables at extremely high speed and with low power.

Test results from our first IC: Transfer Function of 2 -Input Soft. XOR Analog Logic Gate Theory 5 Measurement

Analog Logic Receiver • Front-end – Don’t spend energy amplifying interference § Eliminate Analog-to-Digital Converter (ADC) – Don’t convert interference into bits that we throw away later in base-band § Base-band – Analog Logic is 10 x less power/area compared to digital implementations § Overall Analog Logic receiver – Same analog input and digital output as conventional receiver – Integrate ADC, processing, and gain throughout signal chain 6

Wideband Front-end Acquisition and Tracking Circuit • Analog Logic “Noise Lock Loop”: – Tx: Generate wideband waveforms – Rx: Amplify wide-band waveforms, while rejecting interference • Applications in UWB, Radar, and GPS • 7 Synchronization of Pseudo-Random Signals by Forward-Only Message Passing with Application to Electronic Circuits. IEEE Transactions on Information Theory, August 2006. Vigoda, Gershenfeld, et al.