Abstract
A digital RF receiver front-end employing a DT filter is proposed for application to m-WiMAX & The SAW-less receiver architecture, where the large out-of-band interferer can be rejected selectively by using a scalable frequency response property of FIR filter. In addition to the flexibility of the DT filter, the new non-decimation finite impulse response (NDF) filter can be cascaded to a conventional FIR filter without the decimation effect. Thus, we can easily increase the order of the function-type filtering response and the signal processing bandwidth and the designed receiver front-end is implemented using an IBM 130- nm RF CMOS process. The fabricated chip satisfies the m-WiMAX specification of an 8.75 MHz channel bandwidth and the total system power consumption is 26.63 mA from a 1.5-V supply voltage. The chip shows unwanted blocker rejection over 80 dB, with good linearity of +3.94 dB IIP3.
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