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access icon free Split frequency high-voltage driver for dynamic load modulated RF amplifiers

© The Institution of Engineering and Technology
Received 14/10/2015, Published 09/12/2015

Dynamic load modulation is a technique for increasing RF power amplifier efficiency by manipulating a tuneable matching network (TMN) between the RF transistor and the antenna in harmony with the envelope of the transmitted signal. Generally, TMNs are based on varactor diodes with control voltage swings approaching 100 V, but future devices are likely to need far greater. The varactor driver amplifier proposed here uses a split frequency architecture to amplify a 3 MHz bandwidth 3GPP 4G long-term evolution envelope signal. Under these conditions, it can produce a peak voltage of 166 V at a power consumption of 0.7 W.

Inspec keywords: antennas; varactors; voltage dividers; Long Term Evolution; radiofrequency power amplifiers; 3G mobile communication; 4G mobile communication

Other keywords: 3GPP; split frequency architecture; split frequency high-voltage driver; TMN; 4G; RF power amplifier; long-term evolution envelope signal; voltage swings; voltage 166 V; varactor driver amplifier; RF transistor; dynamic load modulated RF amplifiers; tuneable matching network; varactor diodes; power 0.7 W; bandwidth 3 MHz

Subjects: Junction and barrier diodes; Other analogue circuits; Microwave circuits and devices; Single antennas; Capacitors; Amplifiers

References

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      • 9. Watkins, G.T., Mimis, K.: ‘High linearity lead-lag style envelope modulator for RF power amplifiers’, Int. J. Microw. Wirel. Technol., 2015.
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      • 5. Arnous, M.T., Wiens, A., Preis, S., et al: ‘Load-modulated GaN power amplifier implementing tunable thick film BST components’. 2013 European Microwave Integrated Circuits Conf. (EuMIC), Nuremberg, Germany, 8 October2013, pp. 416–419.
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      • 4. Mimis, K., Watkins, G.T.: ‘Bandwidth reduction in dynamic load-modulated power amplifiers: control and RF signal expansion, efficiency and linearity trade-offs’. 2015 Power Amplifiers for Radio and Wireless Applications (PAWR), San Diego, USA, 26 January 2015, pp. 1–3.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2015.3593
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