A Novel Design in the Use of Planar Transformers for LDMOS Based Amplifiers in Bands II, III, DRM+, DVB-T and DAB+
The coaxial transformer-coupled push-pull circuitry
has been used widely in HF and VHF amplifiers for many decades
without significant changes in the topology of the transformers. Basic
changes over the years concerned the construction and turns ratio of
the transformers as has been imposed upon the newer technologies
active devices demands. The balun transmission line transformers
applied in push-pull amplifiers enable input/output impedance
transformation, but are mainly used to convert the balanced output
into unbalanced and the input unbalanced into balanced. A simple
and affordable alternative solution over the traditional coaxial
transformer is the coreless planar balun. A key advantage over the
traditional approach lies in the high specifications repeatability;
simplifying the amplifier construction requirements as the planar
balun constitutes an integrated part of the PCB copper layout. This
paper presents the performance analysis of a planar LDMOS
MRFE6VP5600 Push-Pull amplifier that enables robust operation in
Band III, DVB-T, DVB-T2 standards but functions equally well in
Band II, for DRM+ new generation transmitters.
[1] Gajadharsing, J. R., Bosma, O., “Analysis and design of a 200 W
LDMOS based Doherty amplifier for 3G base stations”, Microwave
Symposium Digest, 2004 IEEE MTT-S International (Volume: 2), June
2014
[2] Freescale Application Note AN1034 “Three Baluns designs for Push-
Pull Amplifiers”, 1993.
[3] Fager, Carvalho N.B., Pedro, Zirath, “Intermodulation distortion
behavior in LDMOS transistor amplifiers”, Microwave Conference,
Vol.1, pp131-134 2002.
[4] Lee, Seung-Yup; Jeon, Kye-Ik; Yong-Sub Lee; Lee, Kang-Seung; Yoon-
Ha Jeong "The IMD sweet spots varied with gate bias voltages and input
powers in RF LDMOS power amplifiers", Microwave Conference, 2003.
33rd European, on page(s): 1353 - 1356 Vol.3 Volume: 3, 7-9 Oct.
2003.
[5] S. R. Novis and L. Pelletier, "IMD parameters describe LDMOS device
performance", Micro. RF, vol. 37, pp.69 -74 1998
[6] S. Hayano, Y. Nakajima, H. Saotome, and Y. Saito, “A new type high
frequency transformer,” IEEE Trans. Magn., vol. 27, pp. 5205–5207,
Nov. 1991.
[7] Freescale Semiconductor, Document Number, MRFE6VP5600H
Technical Data, (Rev. 1, 1/2011).
[8] NXP Application note AN10858, “174 MHz to 230 MHz DVB-T Power
Amplifier with the BLF578”.
[9] H. Granberg. (1993). Motorolla Semiconductor Application Note
AN749, ‘Broadband Transformers and Power Combining Techniques”
[10] H. S. Tsai, M. J. W. Rodwell, “Planar Amplifier Array With Improved
Bandwidth Using Folded-Slots”, IEEE Microwave And Guided Wave
Leti'ers, Vol. 4, No. 4, April 1994
[11] Tsung-Chi Yu, Chaoen Wang, Lung-Hai Chang, Ming-Chyuan Lin,
Meng-Shu Yeh, “The Development Of High Power Solid-State
Amplifier In NSRRC”, Proceedings of IPAC’10, Kyoto, Japan, 2010
[1] Gajadharsing, J. R., Bosma, O., “Analysis and design of a 200 W
LDMOS based Doherty amplifier for 3G base stations”, Microwave
Symposium Digest, 2004 IEEE MTT-S International (Volume: 2), June
2014
[2] Freescale Application Note AN1034 “Three Baluns designs for Push-
Pull Amplifiers”, 1993.
[3] Fager, Carvalho N.B., Pedro, Zirath, “Intermodulation distortion
behavior in LDMOS transistor amplifiers”, Microwave Conference,
Vol.1, pp131-134 2002.
[4] Lee, Seung-Yup; Jeon, Kye-Ik; Yong-Sub Lee; Lee, Kang-Seung; Yoon-
Ha Jeong "The IMD sweet spots varied with gate bias voltages and input
powers in RF LDMOS power amplifiers", Microwave Conference, 2003.
33rd European, on page(s): 1353 - 1356 Vol.3 Volume: 3, 7-9 Oct.
2003.
[5] S. R. Novis and L. Pelletier, "IMD parameters describe LDMOS device
performance", Micro. RF, vol. 37, pp.69 -74 1998
[6] S. Hayano, Y. Nakajima, H. Saotome, and Y. Saito, “A new type high
frequency transformer,” IEEE Trans. Magn., vol. 27, pp. 5205–5207,
Nov. 1991.
[7] Freescale Semiconductor, Document Number, MRFE6VP5600H
Technical Data, (Rev. 1, 1/2011).
[8] NXP Application note AN10858, “174 MHz to 230 MHz DVB-T Power
Amplifier with the BLF578”.
[9] H. Granberg. (1993). Motorolla Semiconductor Application Note
AN749, ‘Broadband Transformers and Power Combining Techniques”
[10] H. S. Tsai, M. J. W. Rodwell, “Planar Amplifier Array With Improved
Bandwidth Using Folded-Slots”, IEEE Microwave And Guided Wave
Leti'ers, Vol. 4, No. 4, April 1994
[11] Tsung-Chi Yu, Chaoen Wang, Lung-Hai Chang, Ming-Chyuan Lin,
Meng-Shu Yeh, “The Development Of High Power Solid-State
Amplifier In NSRRC”, Proceedings of IPAC’10, Kyoto, Japan, 2010
@article{"International Journal of Information, Control and Computer Sciences:69917", author = "Antonis Constantinides and Christos Yiallouras", title = "A Novel Design in the Use of Planar Transformers for LDMOS Based Amplifiers in Bands II, III, DRM+, DVB-T and DAB+", abstract = "The coaxial transformer-coupled push-pull circuitry
has been used widely in HF and VHF amplifiers for many decades
without significant changes in the topology of the transformers. Basic
changes over the years concerned the construction and turns ratio of
the transformers as has been imposed upon the newer technologies
active devices demands. The balun transmission line transformers
applied in push-pull amplifiers enable input/output impedance
transformation, but are mainly used to convert the balanced output
into unbalanced and the input unbalanced into balanced. A simple
and affordable alternative solution over the traditional coaxial
transformer is the coreless planar balun. A key advantage over the
traditional approach lies in the high specifications repeatability;
simplifying the amplifier construction requirements as the planar
balun constitutes an integrated part of the PCB copper layout. This
paper presents the performance analysis of a planar LDMOS
MRFE6VP5600 Push-Pull amplifier that enables robust operation in
Band III, DVB-T, DVB-T2 standards but functions equally well in
Band II, for DRM+ new generation transmitters.", keywords = "Amplifier, balun, complex impedance, LDMOS,
planar-transformers.", volume = "9", number = "5", pages = "1207-4", }