A Linear Power Amplifier Design Using an AnalogFeedforward Method

ETRI Journal

关键词: linear power amplifier;    high power amplifier;    linearization;    feedforward;    Amplifiers;   

Others  :  1185549
DOI  :  10.4218/etrij.07.0207.0043

【 摘 要 】

We propose and describe the fabrication of a linear power amplifier (LPA) using a new analog feedforward method for the IMT-2000 frequency band (2,110–2,170 MHz). The proposed analog feedforward circuit, which operates without a pilot tone or a microprocessor, is a small and simple structure. When the output power of the fabricated LPA is about 44 dBm for a two-tone input signal in the IMT-2000 frequency band, the magnitude of the intermodulation signals is below –60 dBc and the power efficiency is about 7%. In comparison to the fabricated main amplifier, the magnitude of the third intermodulation signal decreases over 24 dB in the IMT-2000 frequency band.

   

【 参考文献 】

• [1]S.G. Kang et al., "Useful Characteristics for Controlling the Cancellation Performance and Center Frequency of a Linearization Loop," ETRI Journal, vol. 28, no. 2, Apr. 2006, pp. 231-234.
• [2]P.B. Kenington, High Linearity RF Amplifier Design, Artech House, Boston-London, 2000.
• [3]U.H. Park, "Control Circuit Compensates Error Loop in Feedforward Amplifiers," Microwaves & RF, Sep. 2000, pp. 120-130.