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Digital or Analog Modulator and Demodulator?

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zigzagfish

zigzagfish

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Hi, all, I am plan to design a Modulator and Demodulator chip with a CMOS process for the application of IEEE 802.15.4(Zigbee), my question is,

1. which modulation should I choose, GFSK, QPSK or sth else?

2. which kind of MoDem should I choose, Digital or Analog?

Thank you!
 

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