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GSM frequency bands

About: GSM frequency bands is a(n) research topic. Over the lifetime, 559 publication(s) have been published within this topic receiving 5067 citation(s).


Papers
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Journal ArticleDOI
30 Nov 2004
TL;DR: This 0.5-/spl mu/m SiGe BiCMOS polar modulator IC adds EDGE transmit capability to a GSM transceiver IC without any RF filters.
Abstract: This 0.5-/spl mu/m SiGe BiCMOS polar modulator IC adds EDGE transmit capability to a GSM transceiver IC without any RF filters. Envelope information is extracted from the transmit IF and applied to the phase-modulated carrier in an RF variable gain amplifier which follows the integrated transmit VCO. The dual-band IC supports all four GSM bands. In EDGE mode, the IC produces more than 1 dBm of output power with more than 6 dB of margin to the transmit spectrum mask and less than 3% rms phase error. In GSM mode, more than 7 dBm of output power is produced with noise in the receive band less than -164 dBc/Hz.

140 citations

Patent
04 May 1998
TL;DR: In this paper, a GPS/GSM receiver combination for receiving GSM and GPS signals using an RF GPS integrated circuit for downconverting the GPS signal is presented, including a synthesizer for generating LO signals, first and second downconverters for using the LO signals for down-converting GPS signal, and a sampler for providing in-phase and quadrature phase sampled output signals representative of the GPS signals.
Abstract: A GPS/GSM receiver combination for receiving GSM and GPS signals using an RF GPS integrated circuit for downconverting the GPS signal. The GPS integrated circuit includes a synthesizer for generating LO signals, first and second downconverters for using the LO signals for downconverting the GPS signal, and a sampler for providing in-phase and quadrature phase sampled output signals representative of the GPS signal. The synthesizer includes a multi-mode divider for providing substantially the same first LO frequency at about the midpoint of the L1 and L2 GPS frequencies when either of a standard GSM reference frequency or historically common GPS reference frequency is selected. A standby mode in the integrated circuit is controlled by a power logic circuit using a power supply input as a logic control signal. The GSM/GPS receiver combination includes a GSM reference oscillator and a microprocessor system including a GSM frequency correction code for correcting the GSM reference frequency based upon a frequency correction beacon (FCB) signal received in the GSM signal. The GSM-based correction is then used for correcting the GSM reference frequency in order to center a frequency search for acquiring the GPS signal.

124 citations

BookDOI
01 Jan 1997

105 citations

Journal ArticleDOI
TL;DR: A novel compact, lightweight and highly efficient tetra-band rectenna, able to harvest RF energy from GSM 900, GSM 1800, UMTS and WiFi sources available in the ambient, and tested in terms of stored energy while harvesting from a mobile cell-phone call.
Abstract: In this study, we exploit genetic algorithms to design a rectenna required to harvest ambient radio-frequency (RF) energy from four different RF bands in critical (ultra-low power) conditions. For this purpose a set of multi-resonant annular-ring patch antennas are pixel-wise described inside an electromagnetic simulator to provide the `population' of individuals among which the genetic tool is able to select the most adapted one with respect to the design specifications. The further use of circuit-level non-linear simulation tool, based on Harmonic balance technique, allows the rigorous multi-band design of the whole rectenna system in RF stationary conditions at several received power levels. The result is a novel compact, lightweight and highly efficient tetra-band rectenna, able to harvest RF energy from GSM 900, GSM 1800, UMTS and WiFi sources available in the ambient. At these frequency bands high radiation efficiency is desired as an essential prerequisite for optimally handling very low-power densities. Very good agreement with measurements of both the radiating and rectifying designs is demonstrated in real office scenarios. Finally the rectenna is connected to a power management unit and the resulting assembly is tested in terms of stored energy while harvesting from a mobile cell-phone call.

98 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20221
202111
202015
201924
201828
201734