National Semiconductor Corporation

Tektronix, Inc.

Masood Yousefi

Ahmad Reza Bahai

Franco Maloberti

Ali Djabbari

Wei Ma

Ali Kiaei

Gerard G Socci

Pirooz Hojabri

Zhenyong Zhang

Karen Hovakimyan

Mounir Youssef Bohsali

Shougang Wang

A machine-implemented method can include receiving a common input signal over M parallel time-interleaved (TI) analog to digital converter (ADC) channels, determining a multiple-input, multiple-output finite impulse response (FIR) filter structure for correcting bandwidth mismatches between the M parallel TIADC channels, and providing a common output signal comprising TI data corresponding to the M parallel TIADC corrected channels.

Time interleaved analog to digital converter mismatch correction

Multi-channel receiver circuitry for a sub-beam forming receiver of an ultrasound system in which digital filtering, down-sampling and successive data storage circuitry impose programmable fine and coarse time delays on received digital data signals.

Sub-beam forming receiver circuitry for ultrasound system

An oscillator, including amplifier circuitry and resonant circuitry, for providing an oscillation signal with a controllable frequency while maintaining a substantially constant steady state magnitude. Controllable reactive circuitry, included as part of the amplifier circuitry, has a reactance which can be controlled such that the resistive components of the amplifier circuitry and resonant circuitry impedances remain substantially equal. When in the form of serially coupled, controllable capacitances, the controllable reactive circuitry is controlled such that a ratio of changes in the controllable capacitances is approximately equal to a negative ratio of the capacitance values.

Oscillator for providing oscillation signal with controllable frequency

A sigma-delta modulator is provided with a feedback digital-to-analog converter having less resolution than the quantizer, while providing a reduced length output word, requiring minimal additional internal processing, and shaping of the truncation error by an effective noise transfer function greater than the order of the host sigma-delta modulator.

Sigma-delta modulator with DAC resolution less than ADC resolution

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Cupertino, CA, United States of America

Masood Yousefi