### Abstract

Limit-cycle based, self-oscillating amplifiers are
promising candidates for linear amplification of complex signals
with high peak-to-average ratio, while maintaining high power
efficiency. Limit-cycle transmitters employ switch class-D power amplifiers in order to achieve high Efficiency. In this work, accurate expressions have been derived to evaluate powerefficiency of a class-D amplifier in a limit-cycle loop considering the special conditions that apply in this configuration. A general statistical random signal is considered as the input signal and its multisine representation has been employed to facilitate the calculations. A novel approach has been used to determine accurate expressions for the output power and power efficiency of the circuit. Results are in good agreement with circuit simulations (Spectre) of a CMOS 60nm class-D power amplifier.
Index Terms — Limit cycle amplifier, efficiency, linearity, RF power amplifier, power amplifiers.

Original language | English |
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Title of host publication | Proceeding of ProRISC 2009, 26-26 november 2009, Veldhoven, The Netherlands |

Pages | 366-369 |

Publication status | Published - 2009 |

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## Cite this

Sarkeshi, M., Mahmoudi, R., & Roermund, van, A. H. M. (2009). Accurate expressions for the power efficiency of a class-D power amplifier in a limit-cycle transmitter configuration. In

*Proceeding of ProRISC 2009, 26-26 november 2009, Veldhoven, The Netherlands*(pp. 366-369)