A Transistor-Based Analog Predistorter With Unequal Delays for Memory Compensation

A Transistor-Based Analog Predistorter With Unequal Delays for Memory Compensation

A transistor-based analog predistorter (APD) with memory effect compensation is represented. The nonlinearity of a gain amplifier generated by a low supply voltage is used as an error generator. The predistorted signal by the unequal-delayed nonlinear paths improves the linearity by compensating for...

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Veröffentlicht in:IEEE microwave and wireless components letters 2009-11, Vol.19 (11), p.743-745
Hauptverfasser: LEE, Yong-Sub, LEE, Mun-Woo, KAM, Sang-Ho, JEONG, Yoon-Ha
Format: Artikel
Sprache:eng
Schlagworte:
Amplifiers
Analog predistorter (APD)
Applied sciences
Broadband amplifiers
Circuit properties
Compensation
Delay
Delay effects
Delay lines
Electric, optical and optoelectronic circuits
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Gain
Linearity
memory effects
Microwaves
Multiaccess communication
Nonlinearity
power amplifier (PA)
Power amplifiers
Signal generators
Signal processing
Testing
Voltage
Wideband
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Zusammenfassung:A transistor-based analog predistorter (APD) with memory effect compensation is represented. The nonlinearity of a gain amplifier generated by a low supply voltage is used as an error generator. The predistorted signal by the unequal-delayed nonlinear paths improves the linearity by compensating for memory effects of the power amplifier (PA). For verification, the proposed APD with three-branch nonlinear paths is implemented with a 30-W class-AB PA and tested using two-tone and various wideband code division multiple access (WCDMA) signals at 2.14 GHz. From the measured results, the proposed APD significantly improves the linearity of the PA with memory effects.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2009.2032024