Title :
Design of a rail-to-rail, low output impedance class AB power amplifier for envelope tracking of polar modulators
Author :
Salimi, Amir ; Dehghani, Rasoul ; Nabavi, A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Isfahan Univ. of Technol., Isfahan, Iran
Abstract :
This paper presents the design of a class-AB power amplifier suitable for envelope modulator of polar power amplifiers. Polar modulation is one of the most popular RF power amplifier efficiency enhancement techniques. Class-AB power amplifier is a main building block of hybrid switching envelope modulator which is known as linear and efficient envelope modulator architecture. Design of high DC gain, wide bandwidth, low output impedance class-AB is important in the design of HSEM. In this paper the design of a class-AB PA suitable for 10 MHz OFDM signals will be discussed in a 0.18 μm CMOS technology. The class-AB PA has approximately 94 dB DC gain, 704 MHz unity gain bandwidth and 0.25 unity gain negative feedback output impedance at 20MHz.
Keywords :
CMOS integrated circuits; OFDM modulation; UHF amplifiers; modulators; power amplifiers; CMOS technology; HSEM design; OFDM signal; RF power amplifier efficiency enhancement technique; envelope modulator architecture; envelope tracking; frequency 10 MHz; frequency 20 MHz; frequency 704 MHz; hybrid switching envelope modulator; linear architecture; low output impedance class AB power amplifier; polar modulation; polar modulator; polar power amplifier; rail-to-rail class AB power amplifier; size 0.18 mum; Bandwidth; CMOS integrated circuits; Computer architecture; Gain; Impedance; Modulation; Power amplifiers; CMOS; Class AB; cascode compensation; hybrid switching envelope modulator; rail-to-rail;
Conference_Titel :
Advances in Computational Tools for Engineering Applications (ACTEA), 2012 2nd International Conference on
Conference_Location :
Beirut
Print_ISBN :
978-1-4673-2488-5
DOI :
10.1109/ICTEA.2012.6462845
