Pipelining techniques for IIR digital filters

Time-domain, z-domain, and frequency-sampling pipelining techniques are reviewed and compared. Particular emphasis is placed on introducing the concept of infinite impulse response (IIR) pipelining to those who are not aware of its uses and benefits. A fourth technique for pipelining IIR digital filters that does not suffer from the ills of pole-zero cancellation, as the previous techniques do, is introduced. This pipelining technique is based on designing the filter using constrained optimization such that the resulting filter is inherently pipelined. These filters demonstrate specific filter functions that can be realized in VLSI with a large reduction in hardware over the other pipelining techniques while performing equally well