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High-efficiency FSK PSK modulator using multi-channel DDS to achieve zero-crossing switching

  • 2013-09-29
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              Frequency shift keying (FSK) and phase shift keying (PSK) modulation schemes are widely used in digital communications, radar, RFID, and many other applications. In its simplest form, FSK uses two discrete frequencies to transmit binary information, where a logic 1 represents the mark frequency and a logic 0 represents the space frequency. In its simplest form, PSK is binary (BPSK) and uses two phases 180° apart. Figure 1 illustrates these two modulation methods. …             

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