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AD9142ABCPZ Scheda tecnica(PDF) 47 Page - Analog Devices |
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AD9142ABCPZ Scheda tecnica(HTML) 47 Page - Analog Devices |
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47 / 73 page  AD9142A Data Sheet REDUCING LO LEAKAGE AND UNWANTED SIDEBANDS Analog quadrature modulators can introduce unwanted signals at the local oscillator (LO) frequency due to dc offset voltages in the I and Q baseband inputs, as well as feedthrough paths from the LO input to the output. The LO feedthrough can be nulled by applying the correct dc offset voltages at the DAC output using the digital dc offset adjustments (Register 0x3B through Register 0x3E). Effective sideband suppression requires both gain and phase matching of the I and Q signals. The I/Q phase adjust registers (Register 0x37 and Register 0x38) and the DAC FS adjust registers (Register 0x18 through Register 0x1B) can be used to calibrate the I and Q transmit paths to optimize sideband suppression. For more information about suppressing LO leakage and sideband image, refer to the AN-1039 Application Note, Correcting Imperfections in IQ Modulators to Improve RF Signal Fidelity and the AN-1100 Application Note, Wireless Transmitter IQ Balance and Sideband Suppression from the Analog Devices website. Rev. A | Page 46 of 72 |
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