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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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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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 / 直交変調器 / 直交復調器 / 複素信号 / ミキサ / ＲＦ回路 / 無線通信 / ＣＭＯＳデバイス / 電子デバイス・機器 / CMOSデバイス |
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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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Report
(4 results)
Research Products
(14 results)
