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QPSK Modulation Demystified - Maxim/Dallas |
 | | A SPICE simulation is used to illustrate QPSK modulation of a 1MHz sine wave. |
| | The input voltage, QPSK IN, is a 1MHz sine wave whose phase is shifted by 45°, 135°, 225°, and then 315° every 5µs. |
| | Figure 1B is the phasor diagram showing the phase shift of QPSK IN and the demodulated data. |
| www.maxim-ic.com /appnotes.cfm/appnote_number/686 (1319 words) |
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