Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1993-10-15
1995-08-15
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, 330258, H03F 345
Patent
active
054423180
ABSTRACT:
A folded cascode operational amplifier using an improved gain enhancement technique is described. The folded cascode includes an input section, a cascode current mirror section, and a cascode current section. A first fully-differential operational amplifier is coupled to the cascode current mirror section to provide improved gain enhancement thereto and a second fully-differential operational amplifier is coupled to the cascode current source section to provide improved gain enhancement thereto. The differential inputs of the first fully-differential operational amplifier are coupled to feedback nodes of the cascode current mirror section and the differential outputs of the first fully-differential operational amplifier are coupled to control nodes of the cascode current mirror section. The differential inputs of the second fully-differential operational amplifier are coupled to feedback nodes of the cascode current source section and the differential outputs of the second fully-differential operational amplifier are coupled to control nodes of the cascode current mirror section. Coupling the feedback nodes of both current sources to a single fully-differential operational amplifier increases the common mode noise rejection of the corresponding section.
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Bult, Klaas, et al, A Fast Settling CMOS Op Amp for SC Circuits with 90-dB DC Gain, 1990 IEEE Journal, pp. 1379-1384.
Sackinger, et al, A High-Swing, High-Impedance MOS Cascode Circuit, 1990 IEEE Journal (Feb.), pp. 289-298.
Allen, Phillip, et al, CMOS Analog Circuit Design, 1987, pp. 421-425.
Burger, Jr., Harley Franklin, Gain Enhancement Techniques for Single-State CMOS Amplifiers, UCLA Thesis, 1991.
Badyal Rajeev
Shu Shao F.
Hewlett Packard Corporation
Mottola Steven
Nguyen Trep H.
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