4,470 research outputs found
Arithmetic Operations in Multi-Valued Logic
This paper presents arithmetic operations like addition, subtraction and
multiplications in Modulo-4 arithmetic, and also addition, multiplication in
Galois field, using multi-valued logic (MVL). Quaternary to binary and binary
to quaternary converters are designed using down literal circuits. Negation in
modular arithmetic is designed with only one gate. Logic design of each
operation is achieved by reducing the terms using Karnaugh diagrams, keeping
minimum number of gates and depth of net in to consideration. Quaternary
multiplier circuit is proposed to achieve required optimization. Simulation
result of each operation is shown separately using Hspice.Comment: 12 Pages, VLSICS Journal 201
Multi-beam 4 GHz Microwave Apertures Using Current-Mode DFT Approximation on 65 nm CMOS
A current-mode CMOS design is proposed for realizing receive mode multi-beams
in the analog domain using a novel DFT approximation. High-bandwidth CMOS RF
transistors are employed in low-voltage current mirrors to achieve bandwidths
exceeding 4 GHz with good beam fidelity. Current mirrors realize the
coefficients of the considered DFT approximation, which take simple values in
only. This allows high bandwidths realizations using simple
circuitry without needing phase-shifters or delays. The proposed design is used
as a method to efficiently achieve spatial discrete Fourier transform operation
across a ULA to obtain multiple simultaneous RF beams. An example using 1.2 V
current-mode approximate DFT on 65 nm CMOS, with BSIM4 models from the RF kit,
show potential operation up to 4 GHz with eight independent aperture beams.Comment: 7 pages, 4 figures, In: IEEE International Microwave Symposium 201
A Compact CMOS Memristor Emulator Circuit and its Applications
Conceptual memristors have recently gathered wider interest due to their
diverse application in non-von Neumann computing, machine learning,
neuromorphic computing, and chaotic circuits. We introduce a compact CMOS
circuit that emulates idealized memristor characteristics and can bridge the
gap between concepts to chip-scale realization by transcending device
challenges. The CMOS memristor circuit embodies a two-terminal variable
resistor whose resistance is controlled by the voltage applied across its
terminals. The memristor 'state' is held in a capacitor that controls the
resistor value. This work presents the design and simulation of the memristor
emulation circuit, and applies it to a memcomputing application of maze solving
using analog parallelism. Furthermore, the memristor emulator circuit can be
designed and fabricated using standard commercial CMOS technologies and opens
doors to interesting applications in neuromorphic and machine learning
circuits.Comment: Submitted to International Symposium of Circuits and Systems (ISCAS)
201
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