Maintaining loop linearity in presence of threshold adjustment

Details Maintaining loop linearity in presence of threshold adjustment Maintaining loop linearity in presence of threshold adjustment

2010-05-10

2011-11-15

Nguyen, Hieu P (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S290000, C327S307000

Reexamination Certificate

active

08058929

ABSTRACT:
In one embodiment, a method includes receiving, at a filter comprising a Miller amplifier, a differential data signal output by a limiting amplifier (LA), the data signal comprising an output direct current (DC) offset resulting at least in part from a threshold-adjustment signal applied to the LA or an intrinsic DC offset caused by physical characteristics of the LA. In one embodiment, the method additionally includes generating a compensation signal based on the threshold-adjustment signal, a polarity of the compensation signal being opposite a polarity of the threshold-adjustment signal or the DC offset, a magnitude of the compensation signal being a function of the magnitude of the threshold-adjustment signal. In one embodiment, the method further includes introducing the compensation signal to an internal node of the Miller amplifier to compensate for the DC offset to keep one or more amplifier stages of the Miller amplifier in their linear operating regions.

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Maxim, A. et al., “A Low Power 12.5Gb/s SiGe Limiting Amplifier Using a Feed-forward Adjustable Threshold Loss-Of-Signal Detector,”IEEE BIPOLAR/BICMOS Circuits and Technology Meeting, Oct. 1, 2006.
Maxim A: “A 54 dB + 42 dB 10 Gb/s SiGe Transimpedance-Limiting Amplifier Using Bootstrap Photodiode Capacitance Neutralization and Vertical Threshold Adjustment,”IEEE Journal of Solid-State Circuits, 42(9), Sep. 1, 2007.

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