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A 50W GaN HEMT based Doherty PA capable of multi-band performance is shown. This implementation demonstrates the performance in Korean PCS, US PCS and IMT-2000 (Band 1) RF bands with similar artwork but different capacitors and RF shorts used in each design. High power DTCs (Digitally tuned capacitors) and switches would allow for extending this design concept to a digitally programmable multi-band...
This work establishes the closed form equations that can be used to calculate the inter-modulation distortion noise in WCDMA receivers where the distortion mechanisms involve WCDMA modulated blockers. It is shown that the distortion noise depends not only on the power of the blockers but also on the number of channels in the modulated blocker. Simple equations have been provided which can be easily...
In WCDMA receivers, WCDMA modulated adjacent channel interferers (ACI) can distort the useful signal due to non linearity of the front end RF components. Non linearity of the RF front end transfers the modulation of the transmitter (TX) leakage onto the ACI, resulting in cross-modulation distortion. In addition to this, if the ACI signal is strong, it would undergo spectral re-growth and some fraction...
In this paper we analyze and measure the distortion due to self-mixing of transmitter (TX) leakage in WCDMA mobile receivers (RX). The self-mixing is primarily due to the second order non linearity of the mixer, which is very significant in WCDMA receivers due to the high power of the TX leakage signal. Existing published work has analyzed the dependence of this distortion, on the TX leakage power...
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