Broad-band HBT BPSK and IQ modulator MMICs and millimeter-wave vector signal characterization

Chang, Hong-Yeh; Huang, Tian-Wei; Wang, Huei; Wang, Yu-Chi; Chao, P.C.; Chen, Chung-Hsu

doi:10.1109/tmtt.2004.823573

Cited by 40 publications

(17 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The proposed QPSK modulator is implemented in 0.15 μm GaAs low-noise pHEMT process. The measurements show an error vector magnitude and a demodulated I/Q offset <5.8% root-mean-square and −16.1 dB, respectively, from 18 to 26.5 GHz.Introduction: There have been many researches on modulators for direct-conversion architectures [1][2][3][4][5]. Despite there being various modulation specifications, one of the key design issues is the operational bandwidth to maintain a good error vector magnitude (EVM).…”

mentioning

confidence: 99%

“…Despite there being various modulation specifications, one of the key design issues is the operational bandwidth to maintain a good error vector magnitude (EVM). One method to obtain good EVM is to use balanced architectures such as an active Gilbert cell-based modulator [1] and passive reflection-type modulators [2][3][4]. The Gilbert cell-based modulator has a compact size, but increases circuit complexity and power consumption.…”

mentioning

confidence: 99%

“…Introduction: There have been many researches on modulators for direct-conversion architectures [1][2][3][4][5]. Despite there being various modulation specifications, one of the key design issues is the operational bandwidth to maintain a good error vector magnitude (EVM).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Balanced MMIC QPSK modulator with low amplitude and phase errors

et al. 2014

View full text Add to dashboard Cite

A broadband monolithic microwave integrated circuit (MMIC) quadrature phase shift keying (QPSK) modulator with low amplitude and phase errors is proposed. The presented modulator adopts two wideband reflection-type binary BPSK modulators, each consisting of a modified Lange coupler with additional λ/4 transmission lines, varactor diodes, inductors and resistors. The proposed QPSK modulator is implemented in 0.15 μm GaAs low-noise pHEMT process. The measurements show an error vector magnitude and a demodulated I/Q offset <5.8% root-mean-square and −16.1 dB, respectively, from 18 to 26.5 GHz.Introduction: There have been many researches on modulators for direct-conversion architectures [1][2][3][4][5]. Despite there being various modulation specifications, one of the key design issues is the operational bandwidth to maintain a good error vector magnitude (EVM). One method to obtain good EVM is to use balanced architectures such as an active Gilbert cell-based modulator [1] and passive reflection-type modulators [2][3][4]. The Gilbert cell-based modulator has a compact size, but increases circuit complexity and power consumption. A more general modulator topology that can be used is a balanced reflectiontype modulator using push-pull or quadrature balanced schematics. However, these architectures require binary phase shift keying (BPSK) modulators to be well balanced and matched. In this Letter, a new monolithic microwave integrated circuit (MMIC) quadrature phase shift keying (QPSK) modulator using a modified Lange coupler with additional λ/4 transmission lines is proposed to achieve a broadband frequency range.

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Balanced MMIC QPSK modulator with low amplitude and phase errors

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Direct conversion architecture (DCA) greatly reduces front-end hardware complexity, lower cost and no image frequency comparing to heterodyne technique [3][4][5]. Therefore, passive reflection-type demodulator and modulator have been reported in various process [6][7][8] for millimeterwave (MMW) direct conversion systems, even gigabit data rate. However, the local oscillator (LO) leakage and image suppression in these transceivers need be carefully considered.…”

mentioning

confidence: 99%

“…Therefore, passive reflection-type demodulator and modulator have been reported in various process [6][7][8] for millimeterwave (MMW) direct conversion systems, even gigabit data rate. However, the local oscillator (LO) leakage and image suppression in these transceivers need be carefully considered.…”

mentioning

confidence: 99%

Broad-band direct QPSK modulator/demodulator for wireless gigabit communication

Cao

Liu

et al. 2013

Chin. Sci. Bull.

View full text Add to dashboard Cite

The design and measured results of a broad-band direct quadrature phase shift keying (QPSK) modulator and demodulator are described in this paper. The circuits are fabricated using 1-m GaAs HBT technology. To suppress the local oscillator (LO) leakage, the double-balanced mixer is selected as the core unit in the modulator/demodulator. An embedded four-way quadrature divider which includes a Lange coupler and two Baluns is utilized in the system to generate quadrature-phase LO signals. As results of a back-to-back test, the system can operate at data rates in excess of 2 Gb/s (1 Gb/s per I and Q channels) at 30 GHz. The growing data communication speed, bandwidth limitation and congestions at lower frequencies have resulted in the move toward high frequency system. Wireless systems at Ka-band frequencies have various applications such as in point-to-point, point-to-multipoint, and very small aperture terminal (VSAT) systems. One of the most promising wireless communications service is the Local Multipoint Communication Service (LMCS). Additionally, there is a great demand on the Ka-band phased-array radar for military and commercial applications, which includes communications, navigation, weather forecast and so on. To meet the market demands, many researchers have developed highly monolithic microwave integrated circuits (MMICs) design and compact chip size for the high speed system applications [1,2]. Direct conversion architecture (DCA) greatly reduces front-end hardware complexity, lower cost and no image frequency comparing to heterodyne technique [3][4][5]. Therefore, passive reflection-type demodulator and modulator have been reported in various process [6][7][8] for millimeterwave (MMW) direct conversion systems, even gigabit data rate. However, the local oscillator (LO) leakage and image suppression in these transceivers need be carefully considered. Because the LO signal and RF signal are connected in the same device. In addition, the baseband signals of the refection-type modulators need be calibrated, which will limit its applications.The Ka-band has several features that render it ideal for high-data-rate radio links. The wide bandwidth available permits high speed transmission by utilizing a simple modulation scheme such as quadrature phase-shift keying (QPSK). Most importantly, antennas with high gain and directivity are easily realizable in this frequency range with apertures less than 2.3 f t [9]. However, in the compact chip die the passive components need be carefully considered to ensure broad-band phase and amplitude balance of the IQ signals.This paper presents a broad-band modulator and demodulator using 1-m GaAs HBT technology for direct conversion

show abstract

A novel broadband MMIC vector modulator for V-band applications

Ciccognani

Ferrari

Giannini

et al. 2009

Int J RF and Microwave Comp Aid Eng

View full text Add to dashboard Cite

In this study, a new vector modulator topology is presented. The modulator is composed by two ''balanced-load'' biphase modulators. The balanced load is a novel principle allowing a topological simplification of commonly adopted vector modulator schemes: seven couplers are used instead of the 9 ones in traditional reflection-type modulators, with comparable performance. The measured results of monolithic 45-65 GHz test vehicles of the methodology for both biphase and vector modulators, are presented.

show abstract

Broad-band HBT BPSK and IQ modulator MMICs and millimeter-wave vector signal characterization

Cited by 40 publications

References 23 publications

Balanced MMIC QPSK modulator with low amplitude and phase errors

Balanced MMIC QPSK modulator with low amplitude and phase errors

Broad-band direct QPSK modulator/demodulator for wireless gigabit communication

A novel broadband MMIC vector modulator for V-band applications

Contact Info

Product

Resources

About