Direct conversion quadrature demodulators

8 October 2003 Analogue, Mixed Signal, LSI

Linear Technology claims its LT5515 and LT5516 Direct Conversion Quadrature Demodulators deliver exceptionally high linearity, providing more flexible system design and wide spur-free dynamic range. These devices integrate, on a single chip, the functionality of a signal splitter, two high linearity down-converting mixers, a precision local oscillator quadrature generator (0°/90°), and 260 MHz bandwidth output buffers with single-pole, low pass filters on each of the outputs. The devices have applications in cellular infrastructure and in microwave and satellite links, where they directly convert an RF signal to baseband In-phase (I) and quadrature-phase (Q) components. Matched I and Q channels ensure precise gain and phase matching, so that significantly less calibration is required. These direct conversion receiver ICs eliminate the need for additional intermediate frequency (IF) stages, local oscillators,and associated filtering. The LT5515 operates over an input frequency range of 1,5 to 2,5 GHz, and the LT5516 operates with RF input from 0,8 to 1,5 GHz.

Memec SA, 011 897 8600

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