### Abstract

Many critical design trade-offs of the Class-E poweramplifier (e.g power efficiency) are influenced by the switch onresistanceand the value of dc-feed drain inductance. In literature,the time-domain mathematical analyses of the Class-E poweramplifier with finite dc-feed inductance assume zero switch onresistancein order to alleviate the mathematical difficulties;resulting in non-optimum designs.We present analytical design equations in this paper forClass-E power amplifier taking into account both finite draininductance and switch on-resistance. The analysis indicates theexistence of infinitely many design equations; conclusions include:1) Class-E conditions (e.g. zero voltage and zero slope) can besatisfied in the presence of switch-on resistance.2) The drain-efficiency (η) of the Class-E power amplifier isupper limited for a certain operation frequency and transistortechnology.3) Using a finite dc-feed inductance instead of an RF-choke ina Class-E power amplifier can increase η by ≈ 30%.

Original language | English |
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Title of host publication | The IEEE International Symposium on Circuits and Systems (ISCAS)-2007. |

Place of Publication | Piscataway |

Publisher | IEEE Computer Society Press |

Pages | 2818-2821 |

Number of pages | 4 |

ISBN (Print) | 1-4244-0921-7 |

DOIs | |

Publication status | Published - 27 May 2007 |

Event | IEEE International Symposium on Circuits and Systems, ISCAS 2007 - New Orleans, United States Duration: 27 May 2007 → 30 May 2007 http://www.iscas2007.org/ |

### Publication series

Name | |
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Publisher | IEEE |

### Conference

Conference | IEEE International Symposium on Circuits and Systems, ISCAS 2007 |
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Abbreviated title | ISCAS 2007 |

Country | United States |

City | New Orleans |

Period | 27/05/07 → 30/05/07 |

Internet address |

### Keywords

- EWI-9991
- IR-58152
- METIS-245717

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## Cite this

Acar, M., Annema, A. J., & Nauta, B. (2007). Analytical design equations for Class-E power amplifiers with finite DC-Feed inductance and switch on-resistance. In

*The IEEE International Symposium on Circuits and Systems (ISCAS)-2007.*(pp. 2818-2821). Piscataway: IEEE Computer Society Press. https://doi.org/10.1109/ISCAS.2007.378758