Direct up-conversion quadrature modulator covers 800 MHz to 2,7 GHz

23 October 2002 Telecoms, Datacoms, Wireless, IoT

The AD8349 I/Q quadrature modulator is designed to enable a single-stage up-conversion for wireless infrastructure equipment. This Analog Devices' part covers the 800 MHz to 2,7 GHz band, allowing a designer to specify the AD8349, and to standardise on it across multiple operating bands and cellular standards. The device is designed to ease direct up-conversion for CDMA, W-CDMA, GSM Edge, and TDMA transmitters. A direct up-conversion architecture significantly reduces the cost compared to traditional multistage IF approach.

Dynamic range is the key design specification for the cellular infrastructure market. The AD8349 noise floor is specified at -156 dBm/Hz and the P1dB output compression point is specified at +5 dBm, thereby allowing the user to attain a higher output for a given Adjacent Channel Power (ACP). With improved quadrature accuracy (0,2 dB) and phase balance (0,5°), the AD8349 achieves a sideband rejection of -42 dBc.

The I/Q baseband bandwidth is specified out to 200 MHz, thus enabling the device to be used in broadband applications and as a single sideband up-conversion stage in both cellular and wireless access equipment. In addition, the AD8349 I/Q baseband outputs are specified with a bias voltage that eases the interface to Analog Devices' TxDAC transmit path digital to analog converters, eliminating the need for the bias circuitry that is commonly required by competing modulators.

The AD8349 is package and pin compatible with the AD8346 and AD8345 quadrature modulators.

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