A Capacitive Threshold-Logic Gate
نویسندگان
چکیده
A dense and fast threshold-logic gate with a very high fan-in capacity is described. The gate performs sum-ofproduct and thresholding operations in an architecture comprising a poly-to-poly capacitor array and an inverter chain. The Boolean function performed by the gate is soft programmable. This is accomplished by adjusting the threshold with a dc voltage. Essentially, the operation is dynamic and thus, requires periodic reset. However, the gate can evaluate multiple input vectors in between two successive reset phases because evaluation is nondestructive. Asynchronous operation is, therefore, possible. The paper presents an electrical analysis of the gate, identifies its limitations, and describes a test chip containing four different gates of fan-in 30, 62, 127, and 255. Experimental results confirming proper functionality in all these gates are given, and applications in arithmetic and logic function blocks are described.
منابع مشابه
Differential Implementations of Threshold Logic Gates
2. CAPACITIVE SOLUTIONS This paper reviews differential implementations of threshold logic gates, detailing two classes of solutions: capacitive (switched capacitor and floating gate), and conductance/current. The concept underlying capacitive TLGs is the use of an array of capacitors to implement the weighted sum of inputs. The idea was introduced as early as 1966 [6]. Capacitive TLGs can be c...
متن کاملEfficient minimization Techniques for Threshold Logic Gate
optimization techniques are discussed using digital logic network using threshold logic. Almost same energy consumption changing speedup is possible using threshold network and many complex functions can be implemented using threshold logic with lesser number of logic gate and logic level for which these optimization techniques becomes popular for digital system design and applications. In this...
متن کاملReview of Capacitive Threshold Gate Implementations
This is an in-depth survey paper on capacitive hardware implementations of threshold logic gates. The different VLSI solutions include the switched capacitor and the floating gate and their variations. It will be shown how the distinct original proposals from both categories have evolved to become quite similar. The problems with this kind of implementations are pointed out, and their applicati...
متن کاملReview of Differential Threshold Gate Implementations
This paper reviews differential implementations of threshold logic gates, detailing two classes of solutions: capacitive (floating gate and switched capacitor), and conductance/current.
متن کاملDelay Analysis of neuron-MOS and Capacitive Threshold- Logic
A model for the delay of neuron-MOS (neuMOS) and Capacitive Threshold-Logic (CTL) based logic circuits is presented for the first time. It is based on the analysis of the basic neuron-MOS [l] and CTL gate structures [a]. A closed form analytic expression for the delay of the threshold gate is derived. A relation for the delay in terms of an ordinary CMOS inverter delay expressed as a function o...
متن کاملCompact delay modeling of Latch-based Threshold Logic gates
Abstract In this paper we propose a new compact static delay model for latch-based CMOS Threshold logic gates. The particular effects captured by the model are: the dependency of the delay on threshold (data) values and the dependency of the delay vs. capacitive loading. The model parameters were extracted from several Threshold logic gate setups and the delay predicted by the model for a compu...
متن کامل