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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD9786BSV датащи(PDF) 12 Page - Analog Devices |
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AD9786BSV датащи(HTML) 12 Page - Analog Devices |
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12 / 60 page  AD9786 Rev. 0 | Page 12 of 60 Complex Modulation The process of passing the real and imaginary components of a signal through a complex modulator (transfer function = ejwt = coswt + jsinwt) and realizing real and imaginary components on the modulator output. Hilbert Transform A function with unity gain over all frequencies, but with a phase shift of 90 degrees for negative frequencies, and a phase shift of –90 degrees for positive frequencies. Although this function can not be implemented ideally, it can be approximated with a short FIR filter with enough accuracy to be very useful in single sideband radio architectures. Complex Image Rejection In a traditional two part upconversion, two images are created around the second IF frequency. These images are redundant and have the effect of wasting transmitter power and system bandwidth. By placing the real part of a second complex modulator in series with the first complex modulator, either the upper or lower frequency image near the second IF can be rejected. |
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