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This paper presents a 27–34 GHz medium power amplifier in 65-nm CMOS technology. The amplifier is designed to amplify the LO signals from the 30-GHz VCO in a 60-GHz sub-harmonic direct-conversion system. The proposed amplifier achieves a measured gain of higher than 22.8 dB from 27 to 34 GHz, and the gain deviation is within 1 dB. The measured results show a PAE up to 13% at 1-dB compression power...
In this paper, a AlGaAs/InGaAs/GaAs pseudomorphic high electron mobility transistor (PHEMT) monolithic microwave integrated circuit (MMIC) power amplifier for Ka band applications is presented. PHEMT AlGaAs/InGaAs/GaAs epi-layers are grown by metal organic chemical vapor deposition (MOCVD) and 100 nm gate lengths is realized by double exposure e-beam lithography method. The device fabricated by the...
A 24 GHz Power amplifier (PA) with high efficiency designed in the 0.13-μm CMOS process is presented. The proposed adaptive-bias circuit is used to improve the efficiency. The quiescent power consumption is 79.2 mW, which is improved by 53.8mW, compared to that of the optimized fixed-biased (0.6V) PA. Power added efficiency (PAE) and output power (POUT) at a 1-dB-gain-compression-power (P1dB) is 15...
This paper proposes the method of realization of high common-mode rejection ratio(CMRR) at 60 GHz. High CMRR can compensate the differential mismatch. In the proposed method, virtual ground for differential-mode and LC peaking for common-mode are utilized. To confirm the effect of this technique, the 2-stage differential power amplifier is fabricated in a 65nm CMOS process. It achieves a CMRR of 26...
A 60 GHz 4-way power-combining power amplifier (PA) is realized in a 65nm LP CMOS. The PA consists of three common-source (CS) pseudo-differential stages, in which a capacitive neutralization is used to increase the reverse isolation and the maximum gain (Gmax). To achieve high gain within a small area, a new inter-stage impedance matching network is proposed, consisting of transformer, transmission...
A differential-mode bandpass filter (DM-BPF) using novel substrate-embedded defected ground structures (SE-DGSs) is demonstrated. With the proposed SE-DGS, the characteristics of the differential mode remain almost unchanged whereas the common-mode propagation is affected. The varied frequency response of the common mode leads to an avenue for broadening the common-mode suppression bandwidth of the...
In this paper, a new Wilkinson balun is proposed using the asymmetrical T-structure power divider connected with the metamaterial and conventional transmission lines at outputs to improve the phase response flatness. Since the asymmetrical T-structure power divider can be designed to provide a output phase difference, it can be applied to compensate the nonlinear phase difference between the metamaterial...
Miniature broadband 1:1 baluns for differential mode antennas are exhibited with an asymmetric broadside coupled line in an inhomogeneous medium. To design characteristics of a balun for both the in-band and the rejection band, c- and π-mode parameters for the coupled lines are extracted by both simulation and measurement. The rejection band of the broadband balun is shown to be caused by the c-mode...
In this paper, we present a novel design of a balanced bandpass filter using the substrate integrated waveguide cavity. Two square-shaped substrate integrated waveguide cavities are side-by-side with removing the vias on the common sidewall to form the BPF. Pared microstrip lines are used to construct the balanced ports of the proposed circuit. Slots are utilized to perturb the degenerated modes of...
In this paper, a novel differential bandpass filter (BPF) with dual-band filtering response is proposed. The equivalent circuits of proposed dual-band filter are illustrated and analyzed in both differential-mode and common-mode. By controlling the electrical length of an open stub in the differential-mode, two passbands operating at the desired frequency ratio can be designed. Also, the spurious...
A lot of heat treatments are conducted in the medical field through the world. It is strongly demanded to develop a noninvasive temperature measuring techniques inside heating target. In order to obtain the temperature change for the deep target noninvasively, it becomes very difficult because of measuring very small charge of electromagnetic wave signals. Recent development of electromagnetic wave...
In this paper, the interaction between a single band textile antenna with human body is examined. The simulations are performed by means of CST Microwave Studio with a single band 2.4 GHz patch dipole antenna as the radiating source. The effects of bending and different distances from the body are also considered in this study. Results have clearly indicated that the human body has notably shifts...
In order to diagnose sleep apnea-hypopnoea syndrome (SAHS) automatically without using contact-type sensors, we developed a non-contact screening method using amplitude probability (AP) of a compact microwave radar output amplitude which corresponds to respiratory chest movements. We conducted non-contact respiration monitoring of elderly subjects in bed using dual 24-GHz microwave radars attached...
Advanced CMOS technologies provide an easier way to realize radio-frequency integrated circuits (RFICs). However, transistor gates are getting smaller and electrostatic discharges (ESD) issues become more significant. Unfortunately, ESD protections parasitic capacitance limits the operating bandwidth of the RFICs. ESD protection size dimensions are also an issue to protect RFICs. This paper presents...
The needs for in vivo wireless acquisition of bioelectric signals are emerging in various medical and research fields. Biopotentials span a wide range of amplitudes and frequencies making the system design requirement application-oriented. We have developed a versatile integrated wireless platform that can be used to record several types of bioelectrical signals such as electrocorticography (ECoG),...
A design for dual-band circularly polarized (CP) antennas is presented. The antenna is composed of two concentric shorted annular slots, and each slot can generate circular polarization radiation at its one wavelength resonant mode or one-and-a-half wavelength resonant mode by varying the position of the shorted section. When the one wavelength mode of the outer slot and the one-and-a-half wavelength...
An UHF RFID tag antenna which is comprised of a trapezoidal loop and a dual-dipole radiator with an L-slit for omnidirectional polarized reading patterns is designed, fabricated and measured. For a conjugate match to the Monza3 microchip impedance of 44 — j231 at 915 MHz, an orthogonal dual-dipole tag antenna (91 mm × 91 mm) with L-slit on each dipole arm was designed. The read range of the prototype...
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