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Cascode Loads and Amplifier Settling Behavior.
- Source :
-
IEEE Transactions on Circuits & Systems. Part I: Regular Papers . Jan2012, Vol. 59 Issue 1, p44-51. 8p. - Publication Year :
- 2012
-
Abstract
- Cascode loads are commonly assumed to be frequency independent nevertheless: it is shown that cascode loads introduce a pole-zero pair into the amplifier's frequency response. Unfortunately, when designing high-gain high-speed amplifiers based on “all NMOS signal path” concepts, the pole-zero pair introduced by the PMOS cascode is likely to be located near the amplifier's closed-loop bandwidth. Unlike pole-zero pairs located far from the amplifier's closed-loop bandwidth, the effect of pole-zero pairs located near the amplifier's closed-loop bandwidth is highly dependent on the exact configuration of the amplifier. While not always possible, minimizing the capacitance on the cascode node minimizes the effects of this undesirable pole-zero pair. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 15498328
- Volume :
- 59
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers
- Publication Type :
- Periodical
- Accession number :
- 101316608
- Full Text :
- https://doi.org/10.1109/TCSI.2011.2161414