Design and Analysis of Frequency-Tunable Amplifiers using Varactor Diode Topologies

Date

2011-08-01

Author

Nesimoglu, Tayfun

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The design of frequency-tunable amplifiers is investigated and the trade-off between linearity, efficiency and tunability is revealed. Several tunable amplifiers using various varactor diode topologies as tunable devices are designed by using load-pull techniques and their performances are compared. The amplifier using anti-series distortion-free varactor stack topology achieves 38% power added efficiency and it may be tuned from 1.74 to 2.36 GHz (about 35% tunable range). The amplifier using anti-series/anti-parallel topology is tunable from 1.74 to 2.14 GHz (about 23% tunable range) and provides 42% power added efficiency. It is demonstrated that tunable amplifiers using distortion-free varactor stack topologies provide better power added efficiency than the tunable amplifiers using reverse biased varactor diodes and their linearity is similar to that of a conventional amplifier. These amplifiers may facilitate the realization of frequency agile radio frequency transceiver front-ends and may replace several parallel connected amplifiers used in conventional multimode radios.

Subject Keywords

Signal Processing, Applied Mathematics

URI

https://hdl.handle.net/11511/63981

Journal

CIRCUITS SYSTEMS AND SIGNAL PROCESSING

DOI

https://doi.org/10.1007/s00034-011-9309-6

Collections

Engineering, Article

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Citation Formats

T. Nesimoglu, “Design and Analysis of Frequency-Tunable Amplifiers using Varactor Diode Topologies,” CIRCUITS SYSTEMS AND SIGNAL PROCESSING, pp. 705–720, 2011, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/63981.