TY - CHAP
T1 - The optimum power conversion efficiency and associated gain of an LC CMOS oscillator
AU - Murphy, David
AU - Kennedy, Michael Peter
AU - Buckley, John
AU - Qu, Min
PY - 2006
Y1 - 2006
N2 - According to the well known Barkhausen criteria, an oscillator requires a loop gain of greater than 1 to start up. In order to ensure start-up, the literature invariably advises a gain value of around 3. However, no valid argument exists to support this figure. This work demonstrates that this figure, in the case of the voltage-biased differential LC CMOS oscillator, may have some physical significance. Using a simplified model of the oscillator, a direct relationship between gain and power conversion efficiency is established. It it shown that the oscillator has a unique power conversion efficiency maximum and that this maximum corresponds to a gain of approximately 2.75. Extensive SpectreRF simulations support the claims.
AB - According to the well known Barkhausen criteria, an oscillator requires a loop gain of greater than 1 to start up. In order to ensure start-up, the literature invariably advises a gain value of around 3. However, no valid argument exists to support this figure. This work demonstrates that this figure, in the case of the voltage-biased differential LC CMOS oscillator, may have some physical significance. Using a simplified model of the oscillator, a direct relationship between gain and power conversion efficiency is established. It it shown that the oscillator has a unique power conversion efficiency maximum and that this maximum corresponds to a gain of approximately 2.75. Extensive SpectreRF simulations support the claims.
UR - https://www.scopus.com/pages/publications/34547333509
M3 - Chapter
AN - SCOPUS:34547333509
SN - 0780393902
SN - 9780780393905
T3 - Proceedings - IEEE International Symposium on Circuits and Systems
SP - 2633
EP - 2636
BT - ISCAS 2006
T2 - ISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems
Y2 - 21 May 2006 through 24 May 2006
ER -