Apparatus and method for biasing cascode devices in a...

Details Apparatus and method for biasing cascode devices in a... Apparatus and method for biasing cascode devices in a...

2007-08-21

2007-08-21

Lee, Benny (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S261000, C330S259000

Reexamination Certificate

active

11086920

ABSTRACT:
A differential amplifier is configured in a cascode configuration that includes input transistors that are connected to corresponding cascode transistors. The gates of the cascode transistors are tied together to form a common bias for the cascode devices. The input transistors of the differential amplifier receive a differential input signal that is amplified and outputted to an output circuit that is connected to the cascode transistors. The cascode devices require a bias voltage for proper operation. Preferably, the bias voltage puts the cascode devices into the saturation region. The gates of cascode devices are coupled together and connected to a bias terminal. In embodiments of the invention, the bias terminal is connected to another terminal of the chip to provide the bias for the cascode devices.

REFERENCES:
patent: 6515547 (2003-02-01), Sowlati
patent: 6806776 (2004-10-01), Lee et al.
Razavi, “Design of Analog CMOS Integrated Circuits,” McGraw-Hill, Inc., Copyright, 2001, pp. 383-386.

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