US 2006/0067713 A1 · Process and temperature-compensated transimpedance amplifier

Abstract

An optical receiver is disclosed that exhibits an improved phase margin and substantially constant output in response to changes in operating conditions (e.g., temperature, process, etc.). In accordance with the illustrative embodiment, a common-mode feedback comparison is performed prior to conversion of the signal from single-ended to differential voltage. When the common-mode feedback comparison is performed in this way, there are fewer amplifiers in the signal path and the phase margin of the common-mode feedback loop is increased. In addition, as the common-mode feedback is performed at the first stage of the transimpedance amplifier, the gain response of the transimpedance amplifier remains substantially constant in response to changes in temperature, input current range, and for different integrated circuit fabrication processes.

Claims26

Dependent claims

An optical telecommunications system comprising:

(1) an optical fiber;
(2) a photodetector for generating an electric current based on an optical signal from said optical fiber;
(3) a transimpedance amplifier for generating an output voltage based on said electric current, wherein said transimpedance amplifier comprises:
(a) an amplification stage comprising a first input, a second input, a first output, and a second output, and
(b) a feedback network comprising an input, a first output, and a second output;
and
(4) a receiver circuit for processing said output voltage;
wherein said first input of said amplification stage is also said input of said feedback network;
and
wherein said second input of said amplification stage is said second output of said feedback network.

7 more elements

Dependencies are inferred from the claim text.

Process and temperature-compensated transimpedance amplifier

Life of this patent

Process and temperature-compensated transimpedance amplifier

Life of this patent

Abstract

Claims26