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ISL5239KI Folha de dados(PDF) 9 Page - Intersil Corporation |
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ISL5239KI Folha de dados(HTML) 9 Page - Intersil Corporation |
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9 / 31 page  9 The IF converter frequency response is as shown in Figure 7, with the folding effect shown in Figure 7A for the x2, Fs/4 upconverter case. Complex The complex operating mode simply shifts the complex baseband signal up by Fs/4 without any filtering or real conversion. The operation of the IF converter in this mode is shown in Figure 8. Correction Filter (CF) To compensate for imperfections in the analog filtering which takes place after D/A conversion, the correction filter provides an independent 13-tap FIR filter on each channel. These filters may be programmed to remove differential group delay and ripple characteristics of external analog circuits including sin(x)/x correction and frequency response imbalance between the I and Q channels using either amplitude or group delay. This allows for correction of the two physically separate I and Q analog response paths from the DAC’s through the quadrature up-converter. It also provides correction of the bandpass response when operating in a complex frequency shifted IF mode. There are two possible correction filter modes. Real 2X When the IF Converter is set to generate 2x sampled real data, the Correction Filter must be reconfigured to process this data correctly. In this mode it effectively provides one 13- tap block-mode filter when the coefficients for the two filters are programmed identically. Complex or Real 1x When configured for operation in the complex mode, one 13- tap filter is provided for each the I and Q channels. In Real 1x mode, the Q channel is not used. Output Data Conditioner (ODC) The Output Data Conditioner can apply I/Q balance corrections, DC offset corrections and output format conversions. To compensate for gain/phase imperfections in external analog modulation circuits which can result in poor image rejection and reduced dynamic range, the ODC provides an I/Q balance corrector. The I/Q balance corrector provides four coefficients to control the magnitude of the direct and FIGURE 7. x2, IFC FREQUENCY RESPONSE FIGURE 7A. x2, IFC FREQUENCY RESP. WITH FOLDING 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -140 -120 -100 -80 -60 -40 -20 0 NORMALIZED FREQUENCY (NYQUIST=1) IFC FILTER RESPONSE (x2 MODE) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -140 -120 -100 -80 -60 -40 -20 0 NORMALIZED FREQUENCY (NYQUIST=1) IFC FILTER RESPONSE (x2 MODE, WITH FOLDING) FIGURE 8. IF CONVERTER IN COMPLEX MODE OPERATION Q I FROM PD ej(pi/2)(n) Q I BYPASS FIGURE 9. CORRECTION FILTER IN REAL 2X MODE Q I FROM IFC I/Q FIRs 2 2 BYPASS Z-1 2 Z-1 2 Q I FIGURE 10. CORRECTION FILTER IN COMPLEX MODE Q I FROM IFC I-CHAN FIR Q I BYPASS Q-CHAN FIR ISL5239 |
Nº de peça semelhante - ISL5239KI |
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Descrição semelhante - ISL5239KI |
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