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This paper presents the key circuits of a 1MHz bandwidth, 750kb/s GMSK transmitter. The fractional-N synthesizer forming the basis of the transmitter uses a combined phasefrequencydetector (PFD) and digital-to-analog converter (DAC) circuit element to obtain> 28dB high frequency noise reduction when compared to classicalfrequency synthesis.
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A dual band 1.8 GHz 900 MHz, 750 kb s GMSK transmitter utilizing a hybrid PFD DAC structure for reduced broadband phase noise.pdf