| Autor: |
Krupkina, T. Yu., Losev, V. V., Nedashkovskiy, L. V., Chaplygin, Yu. A. |
| Předmět: |
|
| Zdroj: |
Russian Microelectronics; Dec2021, Vol. 50 Issue 7, p543-548, 6p |
| Abstrakt: |
Microwave-quadrature modulators and demodulators are widely used to create modern wireless communication systems. It is important to ensure the high quality of the transmitted signals in order to exchange information without loss or failure. The most critical and undesirable components of the microwave output spectrum are the carrier frequency (heterodyne frequency) and parasitic sideband. Methods for the suppression of the parasitic components are identified in this study with the help of computer simulation. These methods are based on minimizing the phase, amplitude, and current imbalances in various nodes of the microwave-quadrature modulator circuit. For suppression, special digital-to-analog converters are used in conjunction with a polyphase filter on varicaps, a phase-shifting unit, and current sources. The effectiveness of these methods is due to the achievement in the prototypes of values of suppression of parasitic components of 50 dB or more. It is found that for suppression of the parasitic sideband, the minimization of the phase imbalance is more effective than the minimization of the amplitude imbalance. It is revealed that the architecture with the use of a phase-shifting unit is effective for regulating the phase imbalance. The results obtained can be useful in designing high-precision radio-frequency units for various purposes. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink