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US 2019/0131935 A1Published application
Circuit having high-pass filter with variable corner frequency
AssigneeMediatek Inc.
InventorsYing-Wei Chou, Sung-Han Wen, Chen-Chien Lin, Jou Lee
Life of this patent
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Abstract
The present invention provides a circuit having a filter with an amplifier circuit for filtering and amplifying an input signal to generate an output signal, wherein a corner frequency of the filter is adjustable to control a settling time of the output signal.
Claims18
An input stage of a chip, comprising:
- a variable resistor, for directly receiving an input signal from a pad of the chip to generate a first signal;
- and
- an amplifier with a feedback resistor, for amplifying the first signal to generate an output signal;
- wherein in a first mode, the variable resistor is controlled to have a first resistance to increase a settling time of the output signal, and in a second mode, the variable resistor is controlled to have a second resistance greater than the first resistance.
1 more element
An input stage of a chip, comprising:
- an input capacitor, for directly receiving an input signal from a pad of the chip to generate a first signal;
- and
- an amplifier with a feedback resistor and a feedback capacitor, for amplifying the first signal to generate an output signal, wherein the feedback resistor is a variable feedback resistor, or the feedback capacitor is a variable feedback capacitor;
- wherein in a first mode, the feedback resistor or the feedback capacitor is controlled to have the a first lower resistance/capacitance to increase a settling time of the output signal, and in a second mode, the feedback resistor or the feedback capacitor is controlled to have a second resistance/capacitance greater than the first resistance/capacitance.
1 more element
A circuit, comprising:
- a filter with an amplifier circuit, for filtering and amplifying an input signal to generate an output signal;
- wherein a corner frequency of the filter is adjustable to control a settling time of the output signal.
Dependencies are inferred from the claim text.