Topic
Balun
About: Balun is a research topic. Over the lifetime, 5375 publications have been published within this topic receiving 52256 citations. The topic is also known as: Telephone balance unit.
Papers published on a yearly basis
Papers
More filters
Patent•
17 Nov 1998TL;DR: In this paper, a feed circuit includes a folded balun having a balanced port configured to connect an antenna to a communications circuit to achieve an increased operating bandwidth, and a resonating capacitance has a value that provides resonance with an inductance of the balun.
Abstract: A feed circuit connects an antenna to a communications circuit to achieve an increased operating bandwidth. The feed circuit includes a folded balun having a balanced port configured to connect the antenna and an unbalanced port configured to connect to the communications circuit. In addition, a resonating capacitance is connected across the balanced port of the folded balun. The resonating capacitance has a value that provides resonance with an inductance of the balun in such a way that the operating bandwidth of the combined feed circuit and antenna is increased.
17 citations
Proceedings Article•
01 Jan 1997
TL;DR: This paper describes a 2 V full CMOS 1 GHz upconversion mixer which has a single-ended output which avoids the use of any balun and the total power consumption in both the mixer and the output stage is only 22 mW.
Abstract: This paper describes a 2V full CMOS 1 GHz upconversion mixer. The circuit has a single-ended output which avoids the use of any balun. The total power consumption in both the mixer and the output stage is only 22mW. The signal to distortion ratio has been measured to be more than 30 dB. A thorough analysis of the harmonics caused by the nonlinearity of the mixer transistors is performed. The theory is confirmed by the measurements on the presented circuit. The chip has been processed in 0.4 ym CMOS technology.
17 citations
01 Jun 2004
TL;DR: In this paper, a multiband balun topology using both distributed as well as lumped components is presented, where phase and amplitude imbalances are less than 2.5/spl deg/ and 0.6 dB in each band.
Abstract: Baluns operating at multiple frequency bands can result in a reduction in the size of multiband RF front-ends. This paper presents novel multiband balun topologies, using both distributed as well as lumped components. Using LCP packaging technology, baluns operating simultaneously at the 930 and 2000 MHz frequency bands have been fabricated. Measurements show -14.5 dB and -32.4 dB return loss in the lower and upper bands. The phase and amplitude imbalances are less than 2.5/spl deg/ and 0.6 dB in each band.
17 citations
TL;DR: In this paper, a calibration procedure similar to the conventional network analyzer calibration of Kruppa and Sodomsky, where known standards are measured, and these measurements are used to correct measurements of unknown devices, is presented.
Abstract: Balun transformers are used in front of network analyzers to measure the balanced- and common-mode characteristics of transmission lines and electronic networks. The nonideal nature of real baluns will cause measurements made with this technique to be in error. This paper shows that by following a calibration procedure similar to the conventional network analyzer calibration of Kruppa and Sodomsky, where known standards are measured, and these measurements are used to correct measurements of unknown devices, one can compensate for the nonideal nature of the measurement baluns. In this procedure, a conventional two-port network analyzer is connected to the balun transformer and, without disconnecting the network analyzer, inaccuracies in the balun can be calibrated out. Balanced mode, common mode, and mode conversion parameters can be accurately measured. This paper applies the previously published method of Silvonen for conventional network analyzer calibration to correct the measurement errors when using balun transformers.
17 citations
TL;DR: This brief presents a transmit/receive (T/R) switch combined with a transformer balun, which is matched at 5-6 GHz using parasitic capacitances of the transistors at the differential port and an integrated capacitor at the single-ended port.
Abstract: This brief presents a transmit/receive (T/R) switch combined with a transformer balun The differential inductor of the transformer balun is symmetrically wound to have the center taps at the outmost winding The center taps are controlled by nMOS transistors to switch between transmit and receive modes The transformer balun is matched at 5–6 GHz using parasitic capacitances of the transistors at the differential port and an integrated capacitor at the single-ended port For high transmit power handling, two transistors are stacked at the transmit path, and the source and drain of the transistors are biased with a dc voltage The measured insertion loss of the T/R switchable balun is 24–33 dB at 5–6 GHz with a return loss of less than $-$ 16 dB The amplitude and phase imbalance of the balun, respectively, are less than 1 dB and 4 $^{\circ} $ The input 1-dB power compression points for the transmit and receive mode are 28 and 20 dBm, respectively The integrated T/R switchable balun occupies only 012 $\hbox{mm}^{2}$
17 citations