Multi-paths amplifier circuit
AssigneeSTMicroelectronics International N.V.
InventorGregory Wagner
Life of this patent
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Abstract
The present disclosure relates to an amplifier circuit having multiple amplifying paths among which a first amplification path has a notch filter, the amplifier circuit including a control circuit configured to: turn the notch filter conductive when a rate of variation in voltage of a signal present at an input node to the amplifier circuit is detected as being greater than a slew rate of the amplifier circuit; and following the detection, control the notch filter in a sampling mode after a number of periods of a first clock signal.
Claims20
An amplifier circuit, comprising:
- an input node configured to receive a signal;
- multiple amplification paths configured to amplify the signal, wherein a first amplification path includes a notch filter;
- and
- a control circuit configured to:
- turn the notch filter conductive in response to a rate of variation in voltage of the signal being greater than a slew rate of the amplifier circuit;
- and
- control the notch filter in a sampling mode after a number of periods of a first clock signal of the amplifier circuit following turning the notch filter conductive.
A method for operating an amplifier circuit, the method comprising:
- receiving a signal at an input node of the amplifier circuit;
- amplifying the signal at multiple amplification paths of the amplifier circuit, wherein a first amplification path includes a notch filter;
- and
- turning, by a control circuit of the amplifier circuit, the notch filter conductive in response to a rate of variation in voltage of the signal being greater than a slew rate of the amplifier circuit;
- and
- controlling, by the control circuit, the notch filter in a sampling mode after a number of periods of a first clock signal of the amplifier circuit following turning the notch filter conductive.
A control circuit for operating an amplifier circuit, the control circuit configured to:
- turn a notch filter conductive in response to a rate of variation in voltage of a signal at an input node of the amplifier circuit being greater than a slew rate of the amplifier circuit, wherein the amplifier circuit comprises multiple amplification paths for amplifying the signal, wherein a first amplification path includes the notch filter;
- and
- control the notch filter in a sampling mode after a number of periods of a first clock signal of the amplifier circuit following turning the notch filter conductive.
Dependencies are inferred from the claim text.