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.

Broadband high PAE GaN push-pull power amplifier for 500MHz to 2.5 GHz operation

Abstract: A broadband push-pull power amplifier with power added efficiency (PAE) greater than 47% from 500 MHz to 25 GHz is reported The power amplifier comprises two GaN integrated circuits whose outputs are combined with a broadband balun to achieve power up to 20W Each IC contains two stacked GaN HEMTs and is designed to employ a load impedance of 25Ω without any reactive matching in order to achieve broadband operation To provide a better input impedance match to 25Ω and to reduce gain variation over frequency, an RC feedback network is used Measurements, under CW excitation, demonstrated greater than 63% power added efficiency at select frequencies and greater than 47% over the entire bandwidth

A 2-V, low distortion, 1-GHz CMOS up-conversion mixer

Abstract: A 1 GHz, very linear, CMOS up-conversion mixer is presented. The circuit is able to operate at a 2-V power supply. The topology has a true single-ended output stage which avoids the use of any balun. The total power consumption in both the mixers and the output stage is only 22 mW at 2 V. A profound analysis of the origins of distortion in the mixer has been performed. This study has resulted in the optimization of the linearity of the realized up-conversion mixer. The low power consumption, the low supply voltage, the high frequency performance, and the relatively large amplitude and low distortion single-ended off-chip output signal make the presented topology very suitable for wireless applications.

UWB coplanar waveguide‐fed coplanar strips rectangular spiral antenna

Abstract: This article proposes an ultra-wideband coplanar strips (CPS) rectangular spiral antenna that is fed by coplanar waveguide (CPW). The CPS is formed by gradually reducing the width of the CPW ground planes without the need of a balun. The antenna operates in the frequency band (3.5-10.6 GHz) and has miniaturized size of 50 × 40 × 0.508 mm on a Rogers RO4003C substrate. The CPS spiral is terminated with a 100 Ω chip resistor for matching. A parametric study was performed to choose the CPS spiral dimensions. A good agreement is found between simulations and measurements in the radiation pattern and the return loss which was found to be better than 10 dB over the band. The measured peak gain ranges between 1 and 4.7 dBi.

W-band double-balanced down-conversion mixer with Marchand baluns in silicon-germanium technology

Abstract: Presented is a monolithic W-band (75-110 GHz) down-conversion mixer consisting of a double-balanced core, Marchand-type on-chip baluns at inputs, and a two-stage output buffer, fabricated in a 200 GHz f T SiGe technology. Including the loss for input baluns, this mixer exhibits conversion gains of 14.4 plusmn 2.8 dB and single sideband (SSB) noise figures of less than 19.5 dB across the entire W-band, drawing 28 mA from a 3.3 V supply.

An Active IF Balun for a Doubly Balanced Resistive Mixer

Abstract: In this letter, we present a wideband active intermediate frequency (IF) balun for a doubly balanced resistive mixer implemented using a 0.5 mum GaAs pHEMT process. The 0.3 times 0.5 mm2 IF balun was realized through a DC-coupled differential amplifier in order to extend IF frequency of the mixer to DC. The measured amplitude and phase imbalances were less than 1 dB and 5deg, respectively, from DC to 7 GHz. The output third order intercept (OIP3) and P1 dB of the IF balun were 18 dBm and 6 dBm, respectively at 1 GHz. The mixer with the IF balun is 1.7 times 1.8 mm2 in size, has a conversion loss of 2 to 8 dB from 8 to 20 GHz RF frequency at a fixed IF of 1 kHz, which proves the mixer operates successfully at an IF frequency close to DC. The measured OIP3 were +10 to +15 dBm over the operating frequency with a DC power consumption of 370 mW.