Agere Systems Inc.

Menara Networks, Inc.

Christopher A Gill

Salam Elahmadi

Harry Tan

Devin K Ng

Jomo K Edwards

Matthias Bussman

An embodiment of the present invention is a technique for timing recovery. A frequency acquisition loop locks a voltage controlled oscillator (VCO) clock of a multi-band VCO to a reference clock. The frequency acquisition loop generates first and second feedback clocks from the VCO clock. A data lock phase loop generates a driving signal corresponding to a phase error signal from interleaved partial response signal (PRS) samples based on the second feedback clock. The driving signal controls the multi-band VCO in a data phase lock mode. A lock detect controller detects a frequency lock condition in a frequency lock mode and a data lock condition in the data phase lock mode based on the first feedback clock and the reference clock.

Timing recovery for partial-response maximum likelihood sequence detector

The present invention provides an active inductor apparatus and system, having a variable frequency response through inductance adjustment. The active inductor apparatus comprises a variable resistive element and a variable gain element, and the system further comprises an inductance controller and a gain controller. The variable resistive element has a first terminal and a second terminal, with the second terminal capable of receiving a first adjustment signal. The inductance controller is capable of providing the first adjustment signal to control and adjust a resistance level of the variable resistive element. The variable gain element has a third terminal capable of receiving a second adjustment signal. The gain controller is capable of providing the second adjustment signal to control and adjust a transconductance of the variable gain element. The frequency response of the active inductor apparatus and system is variable in response to adjustment of the resistance level of the variable resistive element and in response to adjustment of the transconductance of the variable gain element.

Three-terminal, tunable active inductor

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Orange, CA, United States of America

Christopher A Gill