Four-Quadrant Riemann Problem for a 2×2 System II

The Four-Quadrant Phase Mask Coronagraph. II. Simulations

In the rst article (Rouan et al. 2000) we have described the principle of a coronagraph utilizing a four-quadrant phase-mask and the results of numerical simulations obtained in the perfect case. In this second article, we have performed additional numerical simulations to assess in more detail the performances and limitations of this coronagraph under real conditions. The eeect of geometrical ...

A CMOS Four-Quadrant Analog Multiplier

,4Mrad —A new circuit configuration for an MOS four-quadrant analog multiplier circuit is presented. It is based on the square-law characteristics of the MOS transistor. Two versions have been realized. The first has a linearity better than 0.14 percent for an orrtpnt current swing of 36 percent of the supply current and a bandwidth from dc to 1 MHz. The second version has floating inputs, a li...

A Four-quadrant Floating-gate Synapse

We present a new type of pFET synapse; by degenerating the source, the oxide currents provide stabilizing feedback to the oating gate and to the drain. We present experimental measurements from a oating-gate synapse that simultaniously computes four-quadrant products of its input and weight values, and computes a four-quadrant correlation, typical of hebbian and backpropagation learning rules, ...

A Four Quadrant Cmos Analogue Multiplier

A Four Quadrant Finite Dimensional Thruster Model

This paper reports two speci c improvements in the nite-dimensional nonlinear dynamical modeling of marine thrusters. Previously reported four-quadrant models have employed airfoil theory considering only axial uid ow and using sinusoidal lift/drag curves. First, we present a thruster model incorporating the e ects of rotational uid velocity and inertia on thruster response. Second, we report a...