The estimation of the influence of the multiplier characteristics nonlinearity on the output signals of the quadrature modulator QPSK

2018 ◽  
Author(s):  
Bohdan Mandziy ◽  
Yuriy Shapovalov ◽  
Kseniya Chaban ◽  
Dariya Bachyk
Keyword(s):  
Quadrature Modulator

Silicon In-Phase/Quadrature Modulator With On-Chip Optical Equalizer

2015 ◽  
Vol 33 (6) ◽  
pp. 1191-1196 ◽  
Author(s):  
Po Dong ◽  
Chongjin Xie ◽  
Lawrence L. Buhl ◽  
Young-Kai Chen ◽  
Jeffrey H. Sinsky ◽  
...  
Keyword(s):  
Quadrature Modulator ◽  
On Chip

Research of Methods for Suppression of Parasitic Components in RF Quadrature Modulator Output Signal Spectrum

2021 ◽  
Vol 26 (1) ◽  
pp. 54-63
Author(s):  
T.Yu. Krupkina ◽  
◽  
V.V. Losev ◽  
L.V. Nedashkovskiy ◽  
Yu.A. Chaplygin ◽  
...  
Keyword(s):  
Output Signal ◽  
Communication Systems ◽  
Point Of View ◽  
Phase Shifting ◽  
Signal Spectrum ◽  
Polyphase Filter ◽  
Digital To Analog Converters ◽  
Quadrature Modulator ◽  
Phase Amplitude ◽  
Parasitic Components

The quadrature modulators and demodulators are widely used to create modern wireless communication systems. It is important to ensure high quality of the transmitted signals in order to have the exchange of information without loss or failure. From the point of view of the spectral decomposition of the signal (Fourier series decomposition), the useful component of the spectrum must be much larger than all other components. The carrier (LO frequency and spurious sideband are the most critical and undesirable quadrature modulator output signal spectral components. In the work, in the course of the research using the methods of suppressing the parasitic components, based on minimizing phase, amplitude and current imbalances in various nodes of the quadrature modulator circuit, have been revealed. In order to realize suppression, the special digital-to-analog converters are used in conjunction with a polyphase filter on varicaps, a phase-shifting block and current sources. The effectiveness of these methods is confirmed by the achievement of suppression of parasitic components in prototypes of 50 dB or more. It has been stated that the phase unbalance minimization is more effective than the amplitude unbalance minimization to sideband suppression. It has been revealed that the use of a phase-shifting block is a more suitable architecture to control the phase unbalance. The obtained results can be useful in the design of high-precision radio frequency units for various purposes.

Continuous-time Quadrature Modulator Receivers

2002 ◽  
pp. 387-410 ◽  
Author(s):  
Peter Vancorenland ◽  
Philippe Coppejans ◽  
Michiel Steyaert
Keyword(s):  
Continuous Time ◽  
Quadrature Modulator

Optical minimum-shift-keying transmitter based on a monolithically integrated quad Mach-Zehnder in-phase and quadrature modulator

2009 ◽  
Vol 34 (14) ◽  
pp. 2144 ◽  
Author(s):  
Guo-Wei Lu ◽  
Takahide Sakamoto ◽  
Akito Chiba ◽  
Tetsuya Kawanishi ◽  
Tetsuya Miyazaki ◽  
...  
Keyword(s):  
Monolithically Integrated ◽  
Quadrature Modulator ◽  
Shift Keying
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