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US 10,153,742 B2Granted
Active RC filters
AssigneeNordic Semiconductor ASA
InventorPhil Corbishley
Life of this patent
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Abstract
An operational amplifier comprises: a first amplifier stage 4 comprising a first differential pair of transistors 8, 10 arranged to receive and amplify a differential input signal 18, 20 thereby providing a first differential output signal 22, 24; and a second amplifier stage 6 comprising a second differential pair of transistors 26, 28 arranged to receive and amplify the first differential output signal 22, 24 thereby providing a second differential output signal 38, 40.
Claims12
An operational amplifier comprising:
- a first amplifier stage comprising a first differential pair of transistors arranged to receive and amplify a differential input signal thereby providing a first differential output signal;
- and
- a second amplifier stage comprising a second differential pair of transistors arranged to receive and amplify the first differential output signal thereby providing a second differential output signal
- wherein a common mode voltage of at least one of said first and second differential output signals is controlled by a replica circuit that reflects a topology of one of said first and second amplifier stages;
- wherein the replica circuit controls the common mode voltage in a plurality of amplifier stages including said first and second amplifier stages.
2 more elements
An active RC filter comprising:
- an operational amplifier that comprises:
- a first amplifier stage comprising a first differential pair of transistors arranged to receive and amplify a differential input signal thereby providing a first differential output signal;
- and
- a second amplifier stage comprising a second differential pair of transistors arranged to receive and amplify the first differential output signal thereby providing a second differential output signal
- wherein a common mode voltage of at least one of said first and second differential output signals is controlled by a replica circuit that reflects a topology of one of said first and second amplifier stages;
- wherein the replica circuit controls the common mode voltage in a plurality of amplifier stages including said first and second amplifier stages.
3 more elements
Dependencies are inferred from the claim text.