The Design of Active Polyphase Filter
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چکیده
The fast growth of wireless applications in recent years has driven intense efforts to design highly integrated, high-performance, low-cost RFICs. Both low-IF [33]-[37] and double-quadrature [38]-[40] architectures have been adopted as promising receiver topologies to realize these design goals because they combine the advantages of heterodyne and direct-conversion architectures. In the low-IF receiver, the RF signal is amplified and downconverted to a low IF signal in a single step through the quadrature demodulator. After downconversion, polyphase filters [41][42] must be used to filter image signals at the intermediate frequency for both I and Q channels.
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