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.

Design of 1.8-mW PLL-Free 2.4-GHz Receiver Utilizing Temperature-Compensated FBAR Resonator

Abstract: This paper presents a 1.8-mW 2.4-GHz channelized receiver for ISM-band applications. Unlike traditional ISM-band radios which typically require a phase-locked loop (PLL) for channelization, we propose a modified sliding-IF receiver architecture with a suitable local oscillator (LO) frequency plan utilizing a temperature-compensated thin film bulk acoustic-wave resonator (FBAR). This strategy completely eliminates the need for a PLL by directly dividing down the fixed FBAR oscillator frequency. An inductor-less current-reuse balun LNA is proposed allowing a low-power wideband matching as well as noise cancelling. The frequency conversion is achieved by a hybrid mixer, which stacks a switching mixer on a switched- $g_{m}$ mixer for current reuse. It also features good voltage headroom and common-mode noise rejection. The FBAR-based Colpitts oscillator achieves the phase noise of −144 dBc/Hz at 3.5-MHz offset. The measured RX gain, noise figure, and in-band IIP3 are 57.8 dB, 15.7 dB, and −18.5 dBm, respectively, without external crystal and on-chip inductors, which allows us to reduce the size and weight of the receiver system. It dissipates 0.86 mW (RX) and 0.92 mW (LO) from a single 1-V supply.

A 5.4mW 0.07mm 2 2.4GHz Front-End Receiver in 90nm CMOS for IEEE 802.15.4 WPAN

Abstract: The aim of the 2.4GHz front-end receiver presented in this paper is the minimization of both cost and energy consumption, focusing on WPAN IEEE 802.15.4 transceivers. It includes the entire RF part, from the balun to the first stage of the channel filter, as well as the LO signal conditioning cells. The proposed architecture uses an unmatched inductorless LNA and a new clocking scheme on a standard passive mixer. Compared to previously reported IEEE 802.15.4 receivers, an area reduction by at least 70% is achieved. The power consumption is relatively low at 5.4mW with a state-of-the-art noise and linearity performance. The receiver front-end operates at 1.35V. It is implemented in a 90nm CMOS technology using two thick metals, and alucap with RFMOM capacitors.

65-GHz receiver in SiGe BiCMOS using monolithic inductors and transformers

Abstract: This paper describes a single-chip 65-GHz SiGe BiCMOS radio receiver IC which includes an LNA, a transformer balun, a downconversion mixer, an IF amplifier, and a 65-GHz VCO. The single-ended downconversion gain is 21 dB with an input compression point of -22 dBm. The DSB receiver noise figure is a record 12 dB for IF frequencies in the 0 to 2 GHz range. By employing only transformers and inductors as matching elements, the die area, which includes all pads, is 790 /spl mu/m /spl times/ 740 /spl mu/m.

Bidirectional High Gain Antenna for WLAN Applications

Abstract: —A bidirectional high gain four-element printed dipole array for WLAN (2.4/5.8GHz) applications is analyzed and successfully implemented in this paper. Each element used is a double-side printed dipole fed with a balance twin-lead transmission line. A wide-band balun is implemented for the dipole array. Both simulated and measured data are pretty matched. According to the measured results, the bandwidth with return loss less than −10 dB is about 280MHz (2250–2530MHz) and 510MHz (5470–5980MHz) in the two operating bands, the measured gain for 2.4GHz band is between 4.5 and 5.9 dB, and 6.1–8.9 dB for 5.8GHz respectively. Good shaped patterns have also been attained by tuning parameters of the dipole array.

Wideband Matching of Full-Wavelength Dipole With Reflector for Base Station

Abstract: This communication introduces a wideband hybrid feeding method for full-wavelength dipole antennas with a reflector. A full-wavelength dipole is designed to cover the band from 698 to 960 MHz for cellular base station applications. Its matching circuit consists of a triple-tuned circuit and a quasi-quarter-wavelength impedance transformer. The proposed matching circuit can provide balanced feeding as a balun and has a compact size. The working mechanism and a complete design scheme of the proposed matching circuit are elaborated. The matching circuit is designed and optimized using a circuit theory model and then physically realized using microstrip lines based on full-wave simulation. The measured reflection coefficient $|S_{11}|$ is lesser than −14 dB across the entire band from 698 to 960 MHz, exhibiting a bandwidth of 32%. This is the first time that a wideband center-fed full-wavelength dipole is proposed.