Cascode compensation circuit and method for amplifier stability

The present invention provides compensation for circuits. In one embodiment, a compensation circuit has a first terminal coupled to an output terminal of the circuit and a second terminal coupled to feed back the output voltage to an internal node. A damping circuit may also be coupled to the output...

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Main Authors Venca, Alessandro, Ottini, Daniele, Rezzi, Francesco, Castello, Rinaldo
Format Patent
LanguageEnglish
Published 01.02.2011
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Abstract The present invention provides compensation for circuits. In one embodiment, a compensation circuit has a first terminal coupled to an output terminal of the circuit and a second terminal coupled to feed back the output voltage to an internal node. A damping circuit may also be coupled to the output terminal. The damping circuit adds a pole and a zero to the transfer function of the circuit. In one embodiment, the damping circuit modifies the effect of the output impedance of a load on the transfer function to increase the phase margin of the circuit such that the circuit remains stable over an increased range of output capacitor values.
AbstractList The present invention provides compensation for circuits. In one embodiment, a compensation circuit has a first terminal coupled to an output terminal of the circuit and a second terminal coupled to feed back the output voltage to an internal node. A damping circuit may also be coupled to the output terminal. The damping circuit adds a pole and a zero to the transfer function of the circuit. In one embodiment, the damping circuit modifies the effect of the output impedance of a load on the transfer function to increase the phase margin of the circuit such that the circuit remains stable over an increased range of output capacitor values.
Author Castello, Rinaldo
Venca, Alessandro
Ottini, Daniele
Rezzi, Francesco
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References B.K. Ahuja, "An Improved Frequency Compensation Technique for CMOS Operational Amplifiers", IEEE Journal of Solid-State Circuits, vol. 18, Issue 6, Dec. 1983, pp. 629-633.
Yao Libin, "Fast Settling CMOS Two-Stage Operational Transconductance Amplifiers and Their Systematic Design", IEEE Symposium on Circuits and Systems, vol. 2, May 26-29, 2002, pp. II-839-II-842.
M. Yavari et al., "Hybrid Cascode Compensation for Two-Stage CMOS Operational Amplifiers", IEEE Symposium on Circuits and Systems. vol. 2, May 2005, pp. 1565-1568.
Li et al. (7248117) 20070700
R.J. Reay et al., "An Unconditionally Stable Two-Stage CMOS Amplifier", IEEE Journal of Solid-State Circuits, vol. 30, Issue 5, May 1995, pp. 591-594.
M. Yavari, "Systematic and Optimal Design of CMOS Two-Stage Opamps with Hybrid Cascode Compensation", Proceedings Design, Automation and Test in Europe, vol. 1, Mar. 6-10, 2006, p. 6.
D.B. Ribner et al, "Design Techniques for Cascoded CMOS Op Amps With Improved PSRR and Common-Mode Input Range", IEEE Journal of Solid-State Circuits, vol. 19, Issue 6, Dec. 1984, pp. 919-925.
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Snippet The present invention provides compensation for circuits. In one embodiment, a compensation circuit has a first terminal coupled to an output terminal of the...
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Title Cascode compensation circuit and method for amplifier stability
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