Fir filter architecture
First Claim
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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.
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Abstract
A novel Finite Impulse Response filter (FIR) Filter is provided which includes a plurality of multipliers (14-22), a plurality of multiplexers (24-32), and a plurality of sample and hold circuits (34-42). At least two of the sample and hold circuit output signals (1-5) may be multiplexed in a round robin fashion to at least two of the multipliers (14-22). The multipliers may receive as a second input, fixed tap coefficient signals (C1 -C5) for multiplication with the multiplexed sample and hold circuit output signals (1-5).
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Citations
20 Claims
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1. An FIR filter having an input signal and a filtered output, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of making an FIR filter which has an input signal and a filtered output, said method comprising the steps of:
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supplying a plurality of fixed tap coefficient signals to a plurality of multipliers, one fixed tap coefficient signal per multiplier; providing said input signal to each of a plurality of sample and hold circuits, each of said sample and hold circuits having an output which provides an output signal; multiplexing said plurality of sample and hold circuit output signals in a round robin manner to at least two of said multipliers; and summing the output of each of said plurality of multipliers, said sum being the filtered output of said FIR filter. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of making an FIR filter which has an input signal and a filtered output, said method comprising the steps of:
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providing said input signal to each of a plurality of sample and hold circuits, each of said sample and hold circuits having an output which provides an output signal; supplying said plurality of sample and hold circuit output signals to a plurality of multipliers, one output signal per multiplier; multiplexing a plurality of fixed tap coefficient signals in a round robin manner to each of said plurality of multipliers wherein said fixed tap coefficient signals are analog signals; and summing the output of each of said plurality of multipliers, said sum being the filtered output of said FIR filter. - View Dependent Claims (18, 19, 20)
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Specification