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Description:50MHz to 1000MHz RF / IF Quadrature Demodulator
Manufacturer:Analog Devices
Datasheet:PDF (922K).
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The AD8348 is a broadband quadrature demodulator with an integrated intermediate frequency (IF), variable gain amplifier (VGA), and integrated baseband amplifiers. It is suitable for use in communications receivers, performing quadrature demodulation from IF directly to baseband frequencies. The baseband amplifiers are designed to interface directly with dual-channel ADCs, such as the AD9201, AD9283, and AD9218, for digitizing and postprocessing. The IF input signal is fed into two Gilbert cell mixers through an X-AMP VGA. The IF VGA provides 44 dB of gain control. A precision gain control circuit sets a linear-in-decibel gain characteristic for the VGA and provides temperature compensation. The LO quadrature phase splitter employs a divide-by-2 frequency divider to achieve high quadrature accuracy and amplitude balance over the entire operating frequency range. Optionally, the IF VGA can be disabled and bypassed. In this mode, the IF signal is applied directly to the quadrature mixer inputs via the MXIP and MXIN pins.

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