Patent ID: 7188135
Filing Date: 2007-03-06
Classification: H03H

Abstract:
1. An analog finite impulse response filter having a filter input and a filter output, the filter comprising: a set of N≧2 multipliers, each having first and second multiplier inputs and providing a corresponding multiplier output; a set of N track and hold taps in one to one correspondence with said set of multipliers, each of said taps receiving said filter input and providing a tap output that remains constant except when said tap is triggered to set said tap output to a sample of said filter input, wherein said tap output is provided as said first input of said corresponding multiplier; a set of N coefficient selectors in one to one correspondence with said set of multipliers, each of said coefficient selectors including N tap coefficients and providing a selected one of said tap coefficients to said second input of said corresponding multiplier, wherein said selected tap coefficient is selected according to a time delay since said corresponding tap was most recently triggered; and a summing junction receiving all of said multiplier outputs and providing their sum as said filter output.