2013 Fiscal Year Final Research Report
Design of High-Precision Complex Quadrature Modulators and Demodulators
| Project/Area Number |
23560406
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Electron device/Electronic equipment
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| Research Institution | The University of Aizu |
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Principal Investigator |
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| Project Period (FY) |
2011 – 2013
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| Keywords | 無線通信回路 / 無線トランシーバ / 直交変調回路 / 直交復調回路 / RF回路 |
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| Research Abstract |
Because quadrature amplitude modulation (QAM) is applied to WLANs and cellular systems to obtain higher bit rates, an error vector magnitude (EVM) with less than 1% is strongly demanded. We can express local oscillator (LO) signals with phase and amplitude impairments in the complex signal domain. In a quadrature modulator, the negative-frequency component of the LO signal is an undesired one. Therefore, using a complex quadrature modulator and a complex filter, we can reduce an undesired radio frequency (RF) signal. Moreover, introducing a new LO-phase-error correction circuit, we can get EVMs of less than 1%. This modulator dissipates only 8.2 mW at a 1.2-V-power supply.
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