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In this paper, complete power output unit for an high-frequency (3-30MHz) transmitter system is presented. The system consists of a 4:1 power combiner block, a power control unit which is vital for the effective operation of the system and four commercially available power amplifiers. In order to achieve high-performance, we have focused on the design of power combiners and power control unit. To...
A new design of a hybrid power combiner using double-sided parallel-striplines is proposed for wideband and high power applications. The circuit is used to realize a 4∶1 power combiner. The use of double-sided parallel-strip lines adds flexibility to the design, since different characteristic impedances can readily be realized by simply adjusting the offset between parallel lines, without having to...
In this work, a new SiGe mixer circuit topology operating with the second harmonically pumped mixing technique is proposed. The proposed circuit is developed for to be used in IC receivers which use Zero-IF mixers at their front ends. The Analysis of the circuit is performed and the appropriate operation conditions for second harmonically pumped mixing are investigated. The topology is quite suitable...
In this work, a new mixer topology operating with second harmonically pumped mixing technique is proposed. The proposed topology is developed to be used in zero-if mixers. Analysis are performed and the appropriate operation conditions for second harmonically pumped mixing are investigated for the topology which is suitable for functioning in a wide band. SiGe technology is used for the realization...
In this paper, a compact and long range monostatic UHF (Ultra High Frequency) RFID (Radio Frequency Identification) reader has been designed for UHF RFID applications. Another circuit, called RF multiplexer, has also been designed to reduce the system implementation cost for dense antenna applications. This device has been designed in order to increase the number of antenna output ports of reader,...
Power amplifiers (PAs) are used in the wide range of electronics such as RADAR, base stations, jammers and cable TV applications. These amplifiers can achieve design specifications like high efficiency and high output power (>20W) as much as the capability of the transistor. For this reason; Si LDMOSFETs, GaN HEMTs and GaAs HFETs are advancing their place in the market. In this article; GaN, Si,...
In this paper, a low-noise differential transimpedance amplifier (TIA) for 10 Gbit/s fiber links is presented. The TIA is optimized for the best phase linearity over the bandwidth resulted in a group delay variation less than 1 ps. The circuit is designed with 0.35 μm SiGe heterojunction bipolar transistor BICMOS process. 9 GHz bandwidth, almost 58 dBΩ transimpedance gain with less than 11 pA√Hz input-referred...
Bu çalışmada X-Bant (7.5–10.5 GHz) frekans aralığında çalışan bir entegre sürücü kuvvetlendirici tasarımı sunulmuştur. Bu sürücü kuvvetlendiricisi 0.25-μm SiGe BiCMOS teknolojisi kullanılarak tasarlanmış ve üretilmiştir. Kuvvetlendirici iki kattan oluşmakta ve push-pull kuvvetlendirici mimarisi kullanmaktadır. Kuvvetlendiricinin girişindeki tek uçlu işaretin farksal işarete ve çıkışındaki farksal...
A high efficient GaN HEMT power amplifier with a new topology is presented for to be used at 3.4-3.7 GHz band. Short sections of the Microstrip-lines are used as harmonic traps at the load network in order to improve the efficiency. The fabricated GaN HEMT amplifier delivers 37.5 dBm saturated output power and the maximum power-added efficiency of 80% and a maximum drain efficiency of 83% are obtained...
Based on the Gilbert Mixer topology, an active mixer operating at 2.15 GHz is designed by using the transistors which are realized by using 0.25um SiGe technology. The active balun circuit at the input is realized by using the CB(common base) and CE(common emitter) transistors. The passive capacitive voltage-series feed-forward circuit is applied to CB circuit and an almost perfect broadband matching...
An active mixer operating at 2.15 GHz which is based on the Gilbert Mixer topology is designed by using the transistors which are realized by using 0.25um SiGe technology. The symetrical driving circuit at the input is realized by using the CB(common base) and CE(common emitter) transistors which operate interactively. The passive capacitive voltage-series feed-forward circuit is applied to CB circuit...
In this letter, a compact 3 dB 180° hybrid coupler was proposed, designed, fabricated and measured. This device was derived from the classical hybrid ring coupler whose 3λ/4 section was replaced with inverting suspended microstrip line (SML). The proposed structure has a reduced size compared with the conventional and enhanced variants of the 3 dB 180° hybrid coupler topologies. Moreover, the new...
An active mixer operating at 2.15 GHz which is based on the Gilbert Mixer topology is designed by using the transistors which are realized by using 0.25um SiGe technology. The symetrical driving circuit at the input is realized by using the CB(common base) and CE(common emitter) transistors which operate interactively. The passive capacitive voltage-series feed-forward circuit is applied to CB circuit...
In this work, a dielectric resonator stabilized oscillator with output frequency at 7.7 GHz is designed, simulated and measured. The oscillator topology is based on the series feedback dielectric resonator oscillator (DRO) structure. The precise design procedure of the series feedback dielectric resonator oscillator is presented. A λ/4 open stub microstrip line is arranged at the output port in order...
In this paper, an integrated driver amplifier operating at X-Band (7–10 GHz) frequencies is presented. This driver amplifier is implemented in a 0.25-µm SiGe BiCMOS process. The two-stage push-pull amplifier uses on-chip transformers for the purpose of single-ended to differential signal conversion as well as input and output impedance matching. Operating with a 3.3 V supply voltage, the amplifier...
The 180° hybrid coupler are among the most fundamental building blocks in radio frequency circuits and microwave integrated circuits. These couplers can be found in many applications, including dividers and combiners, modulators and demodulators, balanced mixers, balanced power amplifiers and in the feed network of antenna arrays. The 180° hybrid couplers exhibit some advantages, such as its simple...
This paper reports two different S band GaN MMIC PA designs for WiMAX applications. First PA has a 42.6 dBm output power with a 55%PAE @ 3.5 GHz and 16 dB small signal gain in the 3.2–3.8 GHz frequency range. When two of these MMICs were combined by using off-chip Lange Couplers, 45.3 dBm output power with a 45%PAE @3.5Ghz and 16 dB small signal gain were obtained with less than 0.2 dB gain ripple...
This paper presents a novel wide band microstrip coupler, composed of two parts. The first one is a compensated Wilkinson power divider which provides a good separation between the two output ports. The second is a passive phase shifter composed of two filters consisting of 3 dB 180° hybrid couplers, the coupled and transmitted port being short circuited or open circuited on the bottom and top surfaces...
Among power amplifiers, Class E circuits are very suitable for high efficiency power amplification applications in the radio-frequency. However, because of the single ended structure, these circuits suffer significant harmonic contents in the output and it is usually inevitable to design load matching networks very carefully to get low harmonic content. In this paper, the design of a balanced Class...
In this paper, a low-noise differential transimpedance amplifier (TIA) for 10 Gbit/s fiber links is presented. The TIA is optimized for the best phase linearity over the bandwidth resulted in a group delay variation less than 1 ps. The circuit is designed with the technology of 0.35 μm SiGe heterojunction bipolar transistor BICMOS process. 9 GHz bandwidth, almost 58 dBΩ transimpedance gain with less...
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