Rambus Inc.

Cadence Design Systems, Inc.

Michael Casas

Eric Harris Naviasky

William Pierce Evans

A system and method are provided for level shifting signals generated by an electronic circuit with selectively controlled frequency response. A first circuit portion defines a primary path for a signal within an upper region of a predefined signal frequency range, and includes a first capacitor unit establishing a voltage level shift for a signal passing therethrough. A second circuit portion selectively defines a secondary path bypassing the primary path for a signal within a lower region of the predefined signal frequency range, and includes a switched capacitive section disposed in parallel across the first capacitor unit to establish a voltage level shift for the signal passing therethrough. A second capacitor unit charges substantially to a predetermined shift voltage in a charging phase and couples to the first capacitor unit during a transfer phase. An attenuation adjust unit adjustably augments a parasitic capacitance of the first or second circuit portion.

System and method for level shifting signals with adjustably controlled frequency response

A voltage controlled oscillator amplitude control circuit has a voltage controlled oscillator circuit to output an oscillating signal having a controlled amplitude. It also has a control circuit to control the amplitude of the oscillating signal by providing a dominant pole, a filtering function, rectification, and a gain at a single node of the circuit.

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Pasadena, MD, United States of America

Michael Casas