Abstract—In software radio systems, a digital IIR filter offers good roll-off and transition bandwidth characteristics using a low amount of arithmetic components, thus simplifying hardware implementation. However, IIR filter structures are very sensitive to finite precision compared to FIR filter structures. In order to design a high quality, low component count, digital narrowband bandpass filter onto an FPGA or directly on VLSI, structures of 2 nd order bandpass filters are compared according to their component count, component latency, band narrowness, ease of tuning, and sensitivity to low finite precision. A Direct form structure is shown to be the best method for hardware implementation when designing a digital 2 nd order tunable bandpass filter structure. Keywords—IIR filter structures, finite-precision filters, tunable bandpass filters. I
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