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US 12,074,577 B2Granted
Active filter
AssigneeRenesas Design Technology Inc.
InventorsVladyslav Kozlov, Dmytro Mymrikov
Life of this patent
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Abstract
An active filter comprising an operational amplifier, and a controller configured to control the bandwidth of the operational amplifier based on a filter cutoff frequency setting and/or a noise performance setting.
Claims17
An active filter comprising:
- an operational amplifier;
- a range decoder;
- and
- a controller,
- wherein the controller is configured to:
- control a bandwidth of the operational amplifier based on a filter cutoff frequency setting and/or a noise performance setting by setting its gain bandwidth product;
- set the gain bandwidth product of the operational amplifier to a value:
- i) that is greater than or equal to a gain of the operational amplifier multiplied by the filter cutoff frequency setting;
- and/or
- ii) that provides a noise performance of the operational amplifier that is less than the noise performance setting, and
- wherein the range decoder is configured to:
- receive the filter cutoff frequency setting and/or the noise performance setting;
- and
- generate the value to set the gain bandwidth product of the operational amplifier, the value being generated using the filter cutoff frequency setting and/or the noise performance setting.
11 more elements
A method of controlling an active filter comprising an operational amplifier, a controller, and a range decoder, the method comprising:
- controlling a bandwidth of the operational amplifier based on a filter cutoff frequency setting and/or a noise performance setting by setting its gain bandwidth product, using the controller;
- setting the gain bandwidth product of the operational amplifier, using the controller, to a value:
- i) that is greater than or equal to a gain of the operational amplifier multiplied by the filter cutoff frequency setting;
- and/or
- ii) that provides a noise performance of the operational amplifier that is less than the noise performance setting;
- receiving the filter cutoff frequency setting and/or the noise performance setting at the range decoder;
- and
- generating the value to set the gain bandwidth product of the operational amplifier, using the range decoder, the value being generated using the filter cutoff frequency setting and/or the noise performance setting.
5 more elements
An apparatus being an amplifier or an analog to digital converter, the apparatus comprising an active filter comprising:
- an operational amplifier;
- a range decoder;
- and
- a controller,
- wherein the controller is configured to:
- control a bandwidth of the operational amplifier based on a filter cutoff frequency setting and/or a noise performance setting by setting its gain bandwidth product;
- set the gain bandwidth product of the operational amplifier to a value:
- i) that is greater than or equal to a gain of the operational amplifier multiplied by the filter cutoff frequency setting;
- and/or
- ii) that provides a noise performance of the operational amplifier that is less than the noise performance setting, and
- wherein the range decoder is configured to:
- receive the filter cutoff frequency setting and/or the noise performance setting;
- and
- generate the value to set the gain bandwidth product of the operational amplifier, the value being generated using the filter cutoff frequency setting and/or the noise performance setting.
11 more elements
Dependencies are inferred from the claim text.