1. An FIR filter having an input signal and a filtered output, comprising: a plurality of multipliers, each said multiplier including a first multiplier input, a second multiplier input and an output, each said first multiplier input receiving a signal representing an FIR coefficient; a plurality of sample and hold circuits, each of said plurality of sample and hold circuits including a first output and operable to sample said input signal and hold the value of said input signal on said first output for a predetermined time; a plurality of multiplexers, each comprising a plurality of multiplexer inputs and a second output, at least two of said second outputs each coupled to one of said second multiplier inputs, and at least one of said plurality of multiplexer inputs of a first predetermined number of multiplexers coupled to said first output of a first of said sample and hold circuits; and a summer connected to said output of each of said multipliers, said summer having an output which is said filtered output of said FIR filter.