A Wideband Flexible Power Upconverter for Software Defined Radios


Shrestha, R. and Klumperink, E.A.M. and Mensink, E. and Wienk, G.J.M. and Nauta, B. (2006) A Wideband Flexible Power Upconverter for Software Defined Radios. In: ProRISC 2006, 17th Annual Workshop on Circuits, Systems and Signal Processing, 23-24 November 2006, Veldhoven, The Netherlands.

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Abstract:Abstract— In a multi-standard radio transmitter it is common
practice to use multiple narrowband PA’s and filters: one for
each standard and a switch before them. With the ever
increasing number of different standards to be supported, this
architecture becomes increasingly unpractical, as support for
every new frequency band requires adding a dedicated external
filter. Use of these discrete filters reduces the level of integration,
thus making it difficult to realize low cost multi-radios on a single
RF chip. This paper presents a polyphase multipath technique to
relax or eliminate filters by canceling harmonics and sidebands.
Using this technique, a wideband and flexible power upconverter
with a clean output spectrum is designed in a 0.13μm CMOS for
a software defined radio application. Additionally, a 33% duty
cycle is used to cancel the problematic 3rd harmonic of the LO.
The demonstrator prototype of the proposed power upconverter
operates from DC to 2.4GHz with spurs <-40dBc over more than
a decade in frequency. It can deliver 8dBm of power to a 100Ω
load and consumes 228mW from a 1.2V supply. It uses no filters
but only digital circuits and mixers, and no tuning of components
is required.
Item Type:Conference or Workshop Item
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:
Link to this item:http://purl.utwente.nl/publications/63932
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