Analog FIR filter
AssigneeSemtech Corporation
InventorsAravind Heragu, Eric Vandel
Life of this patent
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Abstract
A FIR filter (15), comprising an input terminal for receiving an input signal, a first filtering circuit comprising: a first transconductance device (30a) configured to generate a first current signal (i1) proportional to the input signal; a first analog switch (41a) commuted in n by a first digital gate signal (ϕ1) and configured to block the current signal when the first digital gate signal has a first value and to transmit the current signal to a first integrating capacitor (45a) when the first digital gate signal has a second value; characterized in that the first digital gate signal (ϕ1) comprises a periodic series of pulses, wherein the pulses have widths proportional to the filter coefficients.
Claims11
A FIR filter, comprising an input terminal for receiving an input signal, a first filtering circuit comprising:
- a first integrating capacitor, a first transconductance circuit configured to generate a first current signal proportional to the input signal;
- a first analog switch commuted by a first digital gate signal and configured to block the first current signal when the first digital gate signal has a first value and to transmit the first current signal to the first integrating capacitor when the first digital gate signal has a second value;
- wherein the first digital gate signal comprises a periodic series of pulses, wherein the pulses have widths proportional to a set of coefficients of the FIR filter.
Dependencies are inferred from the claim text.