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This paper proposes a three-stage broadband Doherty power amplifier with an extended efficiency range for TD-LTE application at 1.9–2.0GHZ. In this design, we use LDMOS devices with a power ratio of 1:1:1, The radial stubs are utilized in the dc bias network to increase the bandwidth. The power added efficiency of the proposed three-stage Doherty PA has been maintained 47% at an average output power...
This paper proposes a 450–470 MHz high efficiency three-stage Doherty power amplifier for IMT-Advanced system. The input matching and output matching are achieved by utilizing microstrip line and lumped-parameter components. Two 3dB couplers are utilized to carry out uneven input power dividing so as to omit the two quarter-wave lines which are usually located before the main amplifier and the second...
A mixed noise filter acceleration algorithm base on mean value and variance similarity is proposed, Which is a improvement of existing better filter algorithm MNF in the present. The algorithm is to Classify of mean value and variance similarity is a local neighborhood of a pixel, the around pixels are divided into two types: similar or not similar. Similar pixels participate in filter algorithm,...
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