DALLAS,TX Texas Instruments Incorporated (TI) has announced an in-phase quadrature (IQ) modulator supporting RF transmissions up to 4 GHz in wireless infrastructure equipment. The TRF3703 modulator supports third-generation (3G) CDMA and GSM wireless telephone networks, as well as WiMAX (802.16e) metropolitan-area data networks (MANs).
The TRF3703 is capable of accepting modulated input signals ranging from zero (DC) to 350 megahertz (MHz), then providing RF output modulation from 400 MHz up to 4 GHz. The SiGe device features a noise floor of -164 dBm/Hz and linearity of +25 dBm for the third order intercept point (OIP3). The adjacent channel power ratio (ACPR) is specified at 77 dBc for -11 dBm single-carrier WCDMA transmission.
The TRF3703 quadrature modulator interfaces to a variety of DACs, including TI's DAC5687. Operating from a single +5-VDC supply, the TRF3703 modulator is implemented as a double-balanced mixer. The RF output block consists of a differential to single-ended converter and an RF amplifier that is capable of driving a single-ended 50-ohm load without any external components. Output compression is +10 dBm, unadjusted carrier leakage is -40 dBm (at 2GHz) and unadjusted sideband suppression is -40 dBc (at 2GHz).
The TRF3703 quadrature modulator is sampling now, with volume production scheduled for Q2 2006. The device is packaged in a 4x4 mm, 24-pin QFN (quad flatpack no-lead) package. Pricing is planned at $7 per unit in quantities of 1K units.
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Texas Instruments, www.ti.com/wi