Abstract
It briefly introduced quadrature demodulator with an integrated intermediate frequency (IF)AD8348 with the microcontroller function, internal structure, pin array and typical apply circuit。 AD8348 is a broadband quadrature demodulator with an integrated intermediate frequency (IF) variable gain amplifier (VGA), and integrated baseband amplifiers. Operating IF frequency 50 MHz to 1000 MHz, Demodulation bandwidth 75 MHz,Phase accuracy 0.5° Amplitude balance 0.25 dB Noise figure 11 dB @ max gain。It is suitable for use in communications receivers, performing quadrature demodu-lation from IF directly to baseband frequencies..Such as QAM/QPSK demodulator W-CDMA MA/GSM/NADC.