Cypress Semiconductor Corporation

Dusan Vecera

Gabriel M Li

Chwei-po Chew

Embodiments of the invention are generally directed to a high-speed differential energy difference integrator (EDI) for adaptive equalizers. In an embodiment, the EDI includes two differential full-wave rectifiers providing differential outputs that are cross-coupled to the inputs of an integration capacitor. In one embodiment, the active areas of the transistors of the differential full-wave rectifiers are substantially the same.

Differential energy difference integrator

Disclosed is a circuit, comprising an input spread spectrum enable signal, a crystal oscillator, a first, second and third sampling flip-flop clocked by the crystal oscillator, configured to sample the input spread spectrum enable signal, and a plurality of control output signals derived from or provided directly from the sampling flip-flops. A method of operating the circuit is further described.

Apparatus and method for limiting the overshoot and undershoot when turning on the spread spectrum of a reference signal

A phase shift and duty cycle correction circuit is disclosed herein as comprising a programmable digital to analog converter (DAC), a storage device (e.g., a capacitor), a charge sub-circuit and dump sub-circuit for charging and discharging the storage device, respectively, a comparator, and a clock driver circuit. A linearly increasing (or ramped) voltage waveform is generated within the storage device by the charging and discharging actions of the charge and dump sub-circuits; a periodic process which is controlled by opposite phases of the input clock. By programming the DAC control input to change the slicing threshold of the ramped waveform, the circuit and method described herein provides a means for programmable phase shifting and duty cycle correction.

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Los Gatos, CA, United States of America

Dusan Vecera