A 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
Estimating the term…
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.
Claims16
A circuit device for canceling glitch pulses in a switched capacitor low-pass filter, including a smoothing final integrator stage, the circuit device comprising a deglitching circuit provided within the filter and serving as a smoothing integrator stage.
A switched capacitor low-pass filter, comprising a first filter output;
- and a cascade of integrator stages that are connected together and to the first filter output, with the first filter output being feedback-connected to an input of each integrator stage;
- wherein one of the integrator stages includes a deglitching circuit provided within the filter to serve as a smoothing integrator stage.
A method of reducing glitches in a switched capacitor filter that includes a first filter output and a final stage amplifier with a first input and a first output coupled to the first filter output, the method comprising:
- connecting a first switched capacitor between a first input node and the first input of the amplifier in response to a first control signal;
- and
- connecting the first switched capacitor between the first input and first output of the amplifier in response to a second control signal.
Dependencies are inferred from the claim text.