Abstract
It briefly introduced the AD8349 designed for RF quadrature modulator applications function, internal structure, pin array and typical apply circuit .The AD8349 can be divided into five sections : the local oscillator(OL) interface ,the baseband voltage–to-current(V-to-I) converter ,the mixers , the differential-to-single-ended (D-to-S) amplifier , and the bias circuit.
The AD8349 can be used as a direct-to-RF modulator in digital communication systems such as GSM , CDMA , and WCDMA base stations , and QPSK or QAM broadband wireless access transmitters .Its high dynamic range and high modulation local multipoint distribution systems (LMDS) using complex modulation formats.
Key words : Quadrature modulator V-to-I converter D-to-S amplifier DAC