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