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Balanced MMIC QPSK modulator with low amplitude and phase errorsopen access
- Issue Date
- Mar-2014
- Publisher
- INST ENGINEERING TECHNOLOGY-IET
- Citation
- ELECTRONICS LETTERS, v.50, no.7, pp 523 - 524
- Pages
- 2
- Journal Title
- ELECTRONICS LETTERS
- Volume
- 50
- Number
- 7
- Start Page
- 523
- End Page
- 524
- ISSN
- 0013-5194
1350-911X
- Abstract
- 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 wide-band reflection-type binary BPSK modulators, each consisting of a modified Lange coupler with additional lambda/4 transmission lines, varactor diodes, inductors and resistors. The proposed QPSK modulator is implemented in 0.15 mu m 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.
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