Rejection circuitry for variable-gain amplifiers and...

Details Rejection circuitry for variable-gain amplifiers and... Rejection circuitry for variable-gain amplifiers and...

2006-08-15

2006-08-15

Nguyen, Linh (Department: 2819)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S254000

Reexamination Certificate

active

07091783

ABSTRACT:
Variable-gain amplifiers (VGAs) and/or continuous-time filters (CTFS) are implemented with circuitry that provides improved power-supply rejection. The power-supply rejection circuitry may include a current source and a diode-connected MOSFET that inhibit noise in the reference-voltage power supply from reaching the output nodes of the VGA or CTF. Although the present invention enables separate implementations of VGAs and CTFs, in one embodiment, a VGA function and a CTF function are implemented in a single set of (e.g., integrated) circuitry.

REFERENCES:
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“A 2.5 Gbps CMOS Optical Receiver Analog Front-End”, by Wei-Zen Chen et al., IEEE 2002 Custon Integrated Circuits Conference, Jun. 2002, pp. 359-362.

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