Active load with adjustable common-mode level

Details Active load with adjustable common-mode level Active load with adjustable common-mode level

2007-10-16

2007-10-16

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S258000

Reexamination Certificate

active

11180678

ABSTRACT:
A differential preamplifier includes an active load with adjustable common-mode output level. The active load includes a transistor pair, a resistor pair, and a current source. The transistor load is employed to provide high gain, low offset, and a large bandwidth for the differential preamplifier. The resistor pair and current source are used to increase the common-mode output level of the differential preamplifier and to bias the transistor load. The current source can be varied to provide an adjustable common-mode output level suitable for driving next stage devices. The active load design allows the differential preamplifier to operate using only low power voltage supplies and with small-sized transistors.

REFERENCES:
patent: 4336502 (1982-06-01), Goto
patent: 6784749 (2004-08-01), Cove
patent: 7142056 (2006-11-01), Blecker et al.

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