400mhz Agc And Quadrature If DemodulatorThe HFA3761 is a highly integrated
baseband converter for quadrature
demodulation applications. The
HFA3761 400MHz AGC and
quadrature IF Demodulator is one of the
seven chips in the PRISM full duplex chip set (see Typical
Application Diagram). It features all the necessary blocks for
baseband demodulation of I and Q signals. It has a two
stage integrated AGC IF amplier with 82dB of voltage gain
and 76dB of gain control range. Baseband antialiasing and
shaping Filters are integrated in the design. Four Filter
bandwidths are programmable via a two bit digital control
Interface In addition, these Filters are continuously tunable
over a 20% frequency range via one external resistor. To
achieve Broadband operation, the Local Oscillator
frequency input is required to be twice the desired
frequency of demodulation. A selectable buffered divide by
2 LO output and a stable reference voltage are provided for
convenience of the user. The device is housed in a thin 80
lead TQFP package well suited for PCMCIA board
applications. By Intersil Corporation
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