Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2005-05-10
2005-05-10
Mottola, Steven J. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S257000
Reexamination Certificate
active
06891433
ABSTRACT:
In one embodiment, the present invention provides an amplifier circuit including a cascode input stage coupled to a differential stage. In another embodiment, an amplifier includes a differential stage coupled to a common gate stage. Embodiments of the present invention also include an improved low voltage amplifier using a 3-stage topology including a wide-swing folded-cascode input stage followed by a differential gain stage which provides improved gain and output compliance. Embodiments of the present invention improve the available cascode stage headroom and reject process and temperature induced parametric variations.
REFERENCES:
patent: 6801087 (2004-10-01), Ausserlechner
Dennis M. Monticelli, A Quad CMOS Single-Supply Op Amp with Rail-to-Rail Output Swing, IEEE Journal of Solid-State Circuits, Dec., 1986, pp1026-1034, vol. SC-21, No. 6.
G. Palmisano, G. Palumbo, and R. Salerno, A 1.5-V High Drive Capability CMOS Op-Amp, IEEE Journal of Solid State Circuits, Feb., 1999, pp 248-252, vol. 34, No. 2.
Ka Nang Leung, Philip K. T. Mok, Wing-Hung Ki, Johnny K. O. Sin, Three-Stage Large Capacitive Load Amplifier with Damping-Facotr-Control Frequency Compensation, IEEE Transactions on Solid-State Circuits, Feb., 2000, pp. 221-230, vol. 35, No. 2.
Linear Technologies Corporation
Mottola Steven J.
Townsend and Townsend / and Crew LLP
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