Title :
49% efficiency power amplifier MMIC utilizing SrTiO/sub 3/ capacitors for 3.5 V Li-ion battery operated CDMA cellular phones
Author :
Iwata, N. ; Yamaguchi, K. ; Nishimura, T.B. ; Takemura, K. ; Miyasaka, Y.
Author_Institution :
Kansai Electron. Res. Lab., NEC Corp., Japan
Abstract :
This paper describes 840 MHz IS-95 power performance of a two-stage power amplifier MMIC with 2.0/spl times/1.5 mm/sup 2/ area utilizing double-doped AlGaAs-InGaAs-AlGaAs FETs and SrTiO/sub 3/ capacitors. Under 3.5 V operation, the developed MMIC including input matching, inter-stage matching and bias circuits delivered an output power of 0.93 W (29.7 dBm), a power-added efficiency (PAE) of 48.6% and an associated gain of 28.4 dB with an adjacent channel leakage power of -42 dBc at 0.9 MHz off-center frequency. Even operated at a reduced supply voltage of 1.2 V, a high PAE of 46.9% was obtained.
Keywords :
JFET integrated circuits; MMIC power amplifiers; UHF integrated circuits; UHF power amplifiers; cellular radio; code division multiple access; field effect MMIC; telephone sets; 0.93 W; 1.2 to 3.5 V; 46.9 to 49 percent; 840 to 900 MHz; AlGaAs-InGaAs-AlGaAs; CDMA cellular phones; IS-95 power performance; Li-ion battery operated phones; SrTiO/sub 3/; SrTiO/sub 3/ capacitors; UHF IC; bias circuits; double-doped HJFETs; heterojunction FETs; input matching; interstage matching; power amplifier MMIC; two-stage power amplifier; Capacitors; Circuits; FETs; Frequency; Gain; Impedance matching; MMICs; Power amplifiers; Power generation; Voltage;
Conference_Titel :
Radio Frequency Integrated Circuits (RFIC) Symposium, 1998 IEEE
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
0-7803-4439-1
DOI :
10.1109/RFIC.1998.682049
