Application of GaAs Discrete p-HEMTs in Low Cost Phase Shifters and QPSK Modulators

Kamenopolsky, S.

doi:10.4218/etrij.04.0103.0143

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…2 shows the proposed SRG&PD circuit. The pHEMT devices in the SRG&PD are biased to operate at the drain-source voltage 0 V, a cold bias of the pHEMT [6]. When 0 V and 0 V, the Rx path is connected and the Tx path is shut-off.…”

Section: Introductionmentioning

confidence: 99%

Compact Six-Port Transceiver for Time-Division Duplex Systems

Lim

Kim

et al. 2007

IEEE Microw. Wireless Compon. Lett.

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A compact six-port transceiver for time-division duplex systems is proposed. The proposed transceiver only uses a single six-port junction for the Tx and Rx mode. Also, we propose the new radio frequency (RF) and baseband interface component, which consists of switch, reflection coefficient generator, and the power detector. The prototype circuits are fabricated to validate the new transceiver with 15-Mbps quadrature phase shift keying (QPSK) digital modulator and 10-Mbps QPSK demodulator at the carrier frequency of 2.4 GHz. The proposed six-port transceiver can provide a simple, low-cost, low-power, and reconfigurable RF design platform.Index Terms-Direct digital conversion, quadrature phase shift keying (QPSK) demodulation, QPSK modulation, reconfigurable radio frequency (RF) system, six-port transceiver.

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Section: Introductionmentioning

confidence: 99%

Compact Six-Port Transceiver for Time-Division Duplex Systems

Lim

Kim

et al. 2007

IEEE Microw. Wireless Compon. Lett.

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A novel TDD mode direct conversion digital transceiver using six-port technology

Lim

Kim

et al. 2006

2006 Asia-Pacific Microwave Conference

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In this paper, a novel time division duplex (TDD) mode direct digital conversion transceiver using six-port technology is proposed for a QPSK communication. We only use one six-port junction (SPJ) for Tx/Rx mode. To change Tx/Rx mode, we propose a new component, which consists of switched reflection coefficient generator and power detector (SRG&PD). The prototype of the propose six-port transceiver is used to realize the QPSK communication with a 2.4GHz carrier frequency and 10Mbps data rates. Also, the proposed transceiver may be used to low cost, low power consumption and reconfigurable RF systems.

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A Comparative Study of a Dielectric-Defined Process on AlGaAs/InGaAs/GaAs PHEMTs

Lim¹,

Ahn²,

Ji³

et al. 2005

ETRI J

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We report on the fabrication of an AlGaAs/InGaAs/GaAs pseudomorphic high electron mobility transistor (PHEMT) using a dielectric‐defined process. This process was utilized to fabricate 0.12 μm × 100 µm T‐gate PHEMTs. A two‐step etch process was performed to define the gate footprint in the SiNx. The SiNx was etched either by dry etching alone or using a combination of wet and dry etching. The gate recessing was done in three steps: a wet etching for removal of the damaged surface layer, a dry etching for the narrow recess, and wet etching. A structure for the top of the T‐gate consisting of a wide head part and a narrow lower layer part has been employed, taking advantage of the large cross‐sectional area of the gate and its mechanically stable structure. From s‐parameter data of up to 50 GHz, an extrapolated cut‐off frequency of as high as 104 GHz was obtained. When comparing sample C (combination of wet and dry etching for the SiNx) with sample A (dry etching for the SiNx), we observed an 62.5% increase of the cut‐off frequency. This is believed to be due to considerable decreases of the gate‐source and gate‐drain capacitances. This improvement in RF performance can be understood in terms of the decrease in parasitic capacitances, which is due to the use of the dielectric and the gate recess etching method.

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Application of GaAs Discrete p-HEMTs in Low Cost Phase Shifters and QPSK Modulators

Cited by 3 publications

References 8 publications

Compact Six-Port Transceiver for Time-Division Duplex Systems

Compact Six-Port Transceiver for Time-Division Duplex Systems

A novel TDD mode direct conversion digital transceiver using six-port technology

A Comparative Study of a Dielectric-Defined Process on AlGaAs/InGaAs/GaAs PHEMTs

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