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Spin transfer torque oscillators (STOs) based on magnetic tunnel junction (MTJ) devices are emerging as a possible replacement for complementary metal-oxide semiconductors for radio-frequency (RF) signal generation. Advantages include low power consumption, small device area, and large frequency tunability. But such a single device cannot achieve the necessary noise performance for RF applications...
Spin transfer torque driven oscillation (STO) in magnetic tunnel junction (MTJ) device can be an attractive solution for microwave signal generation with large frequency tunability, low power consumption and small footprint. In this paper, study shows that single such STO device cannot achieve noise performance in the range suitable for RF applications. Various coupling mechanisms are explored to...
In this paper, we show that the dynamics of injection-locked Spin Hall Effect Spin-Torque Oscillator (SHE-STO) cluster can be exploited as a robust primitive computational operator for non-Boolean associative computing. A cluster of SHE-STOs can be locked to a common frequency and phase with an injected ac current signal. DC input to each STO from external stimuli can conditionally unlock some of...
We propose two approaches to overcome limitation of convex programming technique for analog design automation. Analog design performance constraints are cast in posynomial inequality format for suitability into convex optimization based application. But in most cases original equations are not in posynomial so, either they are deliberately modeled or approximated. This leads to inaccuracy. Our first...
A fast equation free iterative approach for sizing of analog circuit is proposed. Equation based sizing approach has been popular as it removes time consuming simulation effort. If equations are cast in posynomial inequality format, a special optimization technique called geometric programming(GP) can be deployed. The advantage of formulating the problem in GP form is that, it ensures global optimality...
Over the years, as system on chip is increasingly incorporating analog functionalities, there is a need of a tool, which can automate the analog topology selection and sizing flow. We develop one efficient methodology to automatically select the best topology given only the user specifications. The proposed topology selection is a multilevel screening process inherited from geometric programming (GP)...
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