Amplifiers – With semiconductor amplifying device – Including atomic particle or radiant energy impinging on a...
Reexamination Certificate
2007-03-20
2007-03-20
Nguyen, Khanh Van (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including atomic particle or radiant energy impinging on a...
C250S2140AG
Reexamination Certificate
active
10406532
ABSTRACT:
Signal transmission in opto-electronic devices by moving the quiescent component of a differential signal. Exemplary circuits and techniques are disclosed for moving the quiescent component of the differential output signal of a preamplifier amplifying the output of a photodiode to provide an indication of the received signal strength. The quiescent component is moved in response to the average diode current, either symmetrically by imposing the same change on the differential outputs of the preamplifer, or unsymmetrically such as by imposing a change on one of the differential outputs only, and either linearly or nonlinearly with the average diode current. Detection in a postamplifier may be by open circuit techniques, such as by comparing the quiescent output of the preamplifier with a fixed reference, or by using feedback techniques that can cancel or alter the imposed quiescent component. Also exemplary embodiments for use in conjunction with opto-electronic transmitters are disclosed.
REFERENCES:
patent: 6114913 (2000-09-01), Entrikin
patent: 6342694 (2002-01-01), Satoh
patent: 6844784 (2005-01-01), Denoyer et al.
Blakely , Sokoloff, Taylor & Zafman LLP
Maxim Integrated Products Inc.
Nguyen Khanh Van
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