Dual-band transmitters using digitally predistorted frequency multipliers for software defined radios

Two methods of implementing dual-band transmitters using re-configurable circuits operating in conjunction with digital predistortion linearizers are investigated. One method utilizes a circuit topology that can be switched between a fundamental-mode in-phase combined amplifier, and a push-push freq...

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Bibliographic Details
Main Authors: Park, Y., Melville, R., Frye, R.C., Chen, Min, Kenney, J.S.
Format: Conference Proceeding
Language:English
Subjects:
Amplifiers
Applied sciences
Circuit properties
Circuit topology
Diodes
Dual band
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Frequency
Multiaccess communication
Predistortion
Radio transmitters
Radiocommunications
Radiofrequency amplifiers
Radiofrequency integrated circuits
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal convertors
Software radio
Switching circuits
Telecommunications
Telecommunications and information theory
Transmitters. Receivers
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Description
Summary:Two methods of implementing dual-band transmitters using re-configurable circuits operating in conjunction with digital predistortion linearizers are investigated. One method utilizes a circuit topology that can be switched between a fundamental-mode in-phase combined amplifier, and a push-push frequency doubler. Measurement results indicated that the circuit was able to amplify IS-95 B CDMA signals in either the 881 MHz, or the 1763 MHz band with an adjacent-channel power ratio (ACPR) of -48 dBc/30 kHz. Another method that was investigated utilizes fundamental-frequency power amplifier followed by a varactor multiplier that can be bypassed. A varactor-diode doubler with a conversion loss of 3.3 dB was built and tested. An ACPR of -53 dBc/30 kHz at 885 kHz offset was achieved for a CDMA signal transmitted at 1892 MHz.
ISSN:0149-645X
2576-7216
DOI:10.1109/MWSYM.2004.1336038