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US 6,441,762 B2Granted
Circuit device for cancelling out spurious pulses in a switched capacitance low-pass filter, and a filter incorporating it
AssigneeSTMicroelectronics S.r.l.
InventorsMarco Angelici, Marco Ronchi
Life of this patent
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Abstract
A switched capacitor low-pass filter incorporates a plurality of integrator stages cascade connected together. The filter includes at least one stage that includes a circuit device for cancelling out glitch pulses. This device is a deglitching circuit provided within the filter. Preferably, each stage in the filter is formed of a deglitching device which acts as a smoothing integrator.
Claims6
A low-pass filter circuit having a pair of inputs and a pair of outputs, the filter circuit comprising:
- a plurality of filter stages, each filter stage comprising:
- an integrator stage having first and second input terminals and first and second output terminals;
- first and second sampling capacitors connected in series between the respective integrator stage input terminals, via respective first and second sampling switches, and first and second input switches respectively;
- first and second feedback switches coupled to the respective filter circuit outputs, and to the connection of the first and second sampling capacitors with the respective first and second input switches;
- and
- the first and second input switches coupled to the respective first and second inputs of the filter circuit in the case of a first filter stage, and otherwise coupled to the respective first and second output terminals of a preceding integrator stage.
3 more elements
A switched capacitor low-pass filter of multiple order, comprising:
- first and second filter inputs and first and second filter outputs;
- and a cascade of filter stages, each filter stage comprising:
- an integrator circuit having
- first and second input terminals and first and second output terminals;
- first and second sampling capacitors connected in series between the respective integrator stage input terminals, via respective first and second sampling switches and first and second input switches, respectively;
- first and second feedback switches coupled to the respective first and second filter outputs, and to the connection of the first and second sampling capacitors with the respective first and second input switches;
- and
- first and second input switches coupled to the respective first and second inputs in the case of a first stage filter, and otherwise coupled to the respective first and second output terminals of a preceding integrator circuit;
- and
- a final filter stage provided within the filter and configured to serve as asmoothing integrator stage.
7 more elements
Dependencies are inferred from the claim text.