A Multiband Power Amplifier With a Reconfigurable Output-Matching Network for 10-MHz BW LTE Mobile Phone Applications

Abstract

Abstract-A single-chip power amplifier (PA) with a reconfigurable output-matching network is presented for 4G multi-band mobile phone application. The multi-band PA (MBPA) consists of an amplifier and a reconfigurable output-matching network (a band selection circuit and a tunable transmission line). Multi-band, load-impedance modulation is done by controlling a PIN switch of the band selection circuit and varactor diodes of the tunable transmission line in the reconfigurable output-matching network. This MBPA delivered a gain of more than 11 dB, an adjacent-channel-leakage ratio of the evolved universal mobile telecommunications system (UMTS) terrestrial radio access (E-UTRA) smaller than −32 dBc, and a power-added efficiency (PAE) larger than 29% at the output power of 26 dBm for high and low frequency bands with a 10 MHz 16quadrature amplitude modulation long-term-evolution signal.Index Terms -long-term-evolution, multi-band, power amplifier, PAE, reconfigurable output-matching network.1549-7747 (c)

Wideband reconfigurable bandpass filter using coupled lines loaded with varactor loaded stubs

“…To verify the correctness of the zero relations , a simulation of the ideal circuit with randomly selected parameters is carried out on software Ansoft Designer. Figure A shows the simulated results of the ideal circuit of Figure A, and three transmission zeros f z1 , f z2 , and f z3 are obtained (0.432, 1.305, and 1.727 GHz).…”

“…To verify the correctness of the zero relations [11][12][13][14][15][16] , a simulation of the ideal circuit with randomly selected F IGUR E 2 Transmission zeroes of the proposed tunable filter: A, simulated results of the ideal circuit model; B, function curves of F 1 (x), F 2 (x). (Z ee 5 70 X, Z oo 5 40 X, Z 1 5 40 X, Z 2 5 15 X, u 1 5 458@1GHz, u 2 5 908@1GHz, u 3 5 408@1GHz, C v1 5 1 pF, C v2 5 8.5 pF, C v3 5 6.3pF) FI GU RE 3 Simulated results of the reconfigurable bandwidth BPF.…”

“…It has earned much attention for its widespread use in areas like electronic countermeasure, military defense, multifunction transceiver, and dynamic frequency allocation. 1,2 Of all the methods to realize the reconfigurable function, including semiconductor varactor, RF MEMS, BST thin film varactor, and so on, [2][3][4][5][6][7][8][9][10][11][12] semiconductor varactor is the most popular one due to its fast tuning speed and low cost. Planar filters can be very suitable for reconfigurable/switchable filters due to its characteristic of easy fabrication on the printed circuit board and integration with RF tuning components.…”

“…Planar filters can be very suitable for reconfigurable/switchable filters due to its characteristic of easy fabrication on the printed circuit board and integration with RF tuning components. [4][5][6][7][8][9][10][11][12] The research of reconfigurable filters can overall be concluded into center frequency tunability and BW tunability. The center frequency of the bandpass filter can be changed in the result of altering the valid electronic length of the resonator under the effect of tuning components.…”

Concurrent Quad-band Low Noise Amplifier (QB-LNA) using Multisection Impedance Transformer

“…The multiband transceiver accommodate multiple types of wireless technologies simultaneously, making it cheaper, more efficient, and compact [2]. A subsystem of multiband transceiver consists of a multiband antenna (MA) [3], [4], a multiband power amplifier (MPA) [5], [6], a multiband mixer (MM) [7], a multiband band-pass filter (MBPF) [8][9][10] and multiband low noise amplifier (MLNA) [11][12][13]. A low noise amplifier (LNA) is necessary to amplify a signal without increasing the noise and interference at several frequencies simultaneously [14].…”