Construction and use of preamps having discrete gain states

Details Construction and use of preamps having discrete gain states Construction and use of preamps having discrete gain states

2007-04-03

2007-04-03

Lee, Benny (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including atomic particle or radiant energy impinging on a...

C330S278000, C330S291000

Reexamination Certificate

active

11077045

ABSTRACT:
In one embodiment, the linear gain region of a preamp is widened by performing the following actions within the preamp: converting a received input current to a first voltage; in accordance with one of a plurality of discrete gain states, amplifying the first voltage to produce a second voltage; in response to the received input current crossing one or more thresholds, switching the gain state used for amplifying the first voltage; and outputting an indication of the preamp's current gain state. Preamps for performing this and other methods are also disclosed.

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Kucharski, et al., “A Low-Power 10Gb/s AGC Optical Postamplifier in SiGe”, IEEE, 2004, 4 pages.
Rui Tao, et al., “Wideband fully differential CMOS transimpedance preamplifier”, Electronic Letters, Oct. 16, 2003, vol. 39. No. 21, 2 pages.

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