DSRC provides high speed radio link between Road Side Equipment and On-Board Equipment within the narrow communication area. In this paper, a 5.8 GHz down-conversion mixer for DSRC communication system is designed and fabricated using 0.8 m SiGe HBT process technology and RF/LO matching circuits, RF/LO input balun circuits and IF output balun circuit are all integrated on chip. The measured per...

Although many efforts have been exerted, implementation of fully integrated chip for TV tuner application is still a great challenge, to the standard of DVB-C (50M-860MHz) for example. Recent works on wideband LNA [1-2] based on off-chip balun have shown good performances, such as low NF, high linearity and excellent input matching. However, the off-chip balun adds extra cost, loss and much PCB...

The design of a broadband monolithic passive balun using planar-spiral transformers structure is described. Operational frequencies range from 20-30 GHz, and the center frequency is 23 GHz. The performance of the balun is simulated, and results are: the amplitude and phase unbalance between two balanced ports are less than 3 dB and from 20 to 30 GHz for the same frequency range 10, respectively...

This paper presents the design of a calculable standard dipole antenna with a hybrid balun in the frequency range of 1 GHz to 3 GHz. A new formula of an antenna factor is derived by using the power mismatch-loss concept. The antenna factors derived in this paper are in good agreement with the results calculated from S-parameters. The design results show that the calculable dipole antenna with a...

But first concerning controversies there is also a controversy concerning the use or non-use of baluns, and which balun to use. Since many antenna types are balanced, and present day HFTPA’s are unbalanced, and, since the preferred method of feeding antennas is to use coaxial cable, rather than 2-conductor balanced transmission line, a balun should, often must be used in the overall antenna sys...

In this paper, an 8 – 18 GHz wideband low noise amplifier (LNA) with an active balun fabricated in a 0.13-μm SiGe BiCMOS technology was presented. The LNA achieves 16dB of gain with 1.5 dB variation over the 8GHz to 18 GHz frequency band and a matched input with less than -9 dB of reflection. The minimum noise figure (NF) is 5 dB at 8GHz and increases to 6 dB at 18GHz. The measured IIP3 is -15-...

Let the sky noise coupled into the balun (after mismatch losses) be Ts and the active balun noise level be Tb. Define sky noise dominance to be: D = Ts/Tb The ratio of the total system noise, Ts + Tb, to the noise in an ideal system with a noiseless balun is: R = (Ts + Tb)/Ts To obtain the same output fluctuation level in a real system compared with an ideal system one must increase the integra...

The coaxial transformer-coupled push-pull circuitry has been used widely in HF and VHF amplifiers for many decades without significant changes in the topology of the transformers. Basic changes over the years concerned the construction and turns ratio of the transformers as has been imposed upon the newer technologies active devices demands. The balun transmission line transformers applied in p...

Prior to the ISSC visit, we participated in the assembly and installation of eight of the LWDA small blade antennas. This work was done in collaboration with students and faculty from the University of New Mexico and was valuable in acquainting us with the final LWDA antenna design. Figure 1 shows a photograph of some of the assembled small blade antennas at the LWDA site. Hicks baluns assemble...

A direct downconversion receiver implemented in 0.13 μm 1P8M process is presented. The circuit is formed by a single-end LNA, an active balun for conversion into balanced mode, a quadrature double-balanced passive switch mixer and a quadrature voltage-controlled oscillator. The receiver operates in the 2.4 GHz ISM band and complies with IEEE 802.15.4 (ZigBee) specifications. The circuit exhibit...