Agere Systems Inc.

John E Scoggins

Hrvoje Jasa

Gary D Polhemus

Kenneth Patrick Snowdon

James A Siulinski

Shahriar Moinian

An inductor device in an integrated circuit includes a first winding portion, a bridge portion and a second winding portion. The integrated circuit has a first, a second, a third and a fourth metallization level. The first winding portion comprises a first metal line formed on the first metallization level and a second metal line formed on the second metallization level, the first metal line being electrically connected in parallel with the second metal line. The bridge portion comprises a third metal line formed on the third metallization level and a fourth metal line formed on the fourth metallization level, the third metal line being electrically connected in parallel with the fourth metal line. The second winding portion comprises a fifth metal line formed on the first metallization level and a sixth metal line formed on the second metallization level, the fifth metal line being electrically connected in parallel with the sixth metal line. The bridge portion electrically connects the first winding portion to the second winding portion.

Differential inductor for use in integrated circuits

An optical transmission system comprises an electrical source and an electrical-to-optical converter. The electrical source is adapted to provide an electrical signal at an output thereof. The electrical-to-optical converter has an input coupled to the output of the electrical source and is operative to convert the electrical signal to a corresponding output optical signal. The electrical source comprises a pre-emphasis circuit or other electrical signal equalization circuitry configurable to control a waveform of the electrical signal so as to produce a desired level of jitter in the output optical signal.

Optical signal jitter reduction via electrical equalization in optical transmission systems

A differential voltage-controlled oscillator (VCO) employs at least two pairs of varactors, each pair of varactors driven with a corresponding differential control voltage, to generate a differential oscillating waveform. The capacitance of each pair of varactors adds to form the total capacitance of an inductor-capacitor (LC) tank circuit of the VCO, which determines an oscillation frequency of the differential oscillating waveform of the VCO. One differential control voltage controls a capacitance of the first varactor pair for a relatively coarse adjustment of the oscillation frequency, and the other differential control voltage controls a capacitance of the second varactor pair for a relatively fine adjustment of the oscillation frequency.

Dual differential LC voltage-controlled oscillator

A phase detector (PD) generates an up/down signal based on the phase error between data and clock signals input to the phase detector. A voltage controlled oscillator (VCO) generates the clock signal. The up/down signal is applied to a proportional charge pump and a truncated version of the up/down signal is applied to an integral charge pump. The proportional charge pump generates a first voltage for a first time period across a resistor based on the up/down signal, while the integral charge pump generates a second voltage for a second time period across a capacitor based upon the truncated version of the up/down signal and the sampling rate of the data signal by the PD. The second time period is less than the first time period. The first and second voltages are combined and applied to the VCO to drive the clock signal to synchronization with the data.

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Dover, NH, United States of America

John E Scoggins