General Description The PMB 2208 contains a direct quadrature modulator and an up/down conversion mixer with corresponding bias circuitry. Features ■ Direct quadrature modulator and up/down-conversion mixer on one chip ■ Modulator: - LO input frequency range from 200MHz to 550MHz corresponds to an output frequency range from 100MHz to 275MHz - Generation of orthogonal carriers without external elements and without trimming - typ. 48dB carrier suppression with 1Vpp baseband level - typ. 49dB SSB suppression with 1Vpp baseband level - typ. 51dB rejection of third-order intermodulation products with 1Vpp baseband level - Low output noise floor ■ Mixer: - Double-balanced Gilbert cell - RF and IF frequency range from DC to 2.5GHz - typ 39dB carrier suppression - Low noise ■ Supply voltage range from 2.7 to 4.5V ■ Power-down mode ■ Temperature range -30 to 85°C Application ■ Vector-modulated digital mobile cellular systems, such as GSM, PDC-800, PDC-1.5, PHS, DAMPS, DCS1800, WLAN, etc. ■ Various modulation schemes, such as PM, PSK, FSK, QAM, QPSK, GMSK, etc. ■ Analog systems with FM and AM modulation ■ Space- and power-saving optimizations of existing discrete transmitter circuits
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