Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1998-07-08
2000-01-25
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330259, H03F 345
Patent
active
060182687
ABSTRACT:
The present invention relates to the design of high speed and high gain operational amplifiers for use in for example high performance switched-capacitor analog circuits. Increasing the gain without suffering the speed may be achieved by designing the amplifier as a single-stage operational tranconductance amplifier with single cascode for the N-type transistors (M8, M9) and double cascode for P-type transistors (M4, M5 and M10, M11). The invention may also comprise a continuous-time common-mode feedback. With this design of the invention, high speed and high gain can be maintained with a large phase margin to guarantee the stability.
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Kamath et al., "Relationship Between Frequency Response and Settling Time of Operational Amplifiers", IEE Journal of Solid-State Circuits, vol. sc-9, No. 6, pp. 347-352, Dec. 1974.
Nguyen Patricia T.
Pascal Robert
Telefonaktiebolaget LM Ericsson
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