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US 11,108,370 B2Granted
Filter circuit and amplifier circuit
AssigneeKabushiki Kaisha Toshiba
InventorKentaro Ikeda
Life of this patent
Estimating the term…
Abstract
A filter circuit has a first resistor which is connected between an input node and an output node, a second resistor which is connected between the output node and a reference potential node, a first capacitor and a second capacitor which are connected in series between the input node and the output node, and a variable capacity part which is connected between a connection node of the first capacitor and the second capacitor and the reference potential node.
Claims19
A filter circuit comprising:
- a first resistor which is connected between an input node and an output node;
- a second resistor which is connected between the output node and a reference potential node;
- a first capacitor and a second capacitor which are connected in series between the input node and the output node;
- and
- a variable capacity part which is connected between a connection node of the first capacitor and the second capacitor and the reference potential node,
- wherein the first resistor is connected in parallel to the first capacitor and the second capacitor which are connected in series.
3 more elements
An amplifier circuit comprising:
- a filter circuit;
- an amplifier which amplifies a differential signal of an input signal and an output signal of the filter circuit;
- an oscillation detection part which detects whether an amplified signal output from the amplifier is oscillated or not;
- and
- a control part which generates a control signal for controlling the filter circuit on the basis of a detection result of the oscillation detection part, wherein
- the filter circuit includes
- a first resistor which is connected between an input node and an output node,
- a second resistor which is connected between the output node and a reference potential node,
- a first capacitor and a second capacitor which are connected in series between the input node and the output node, and
- a variable capacity part which is connected between a connection node of the first capacitor and the second capacitor and the reference potential node, and
- the filter circuit outputs the output signal corresponding to the amplified signal input to the input node from the output node to input the output signal to the amplifier in a state where a capacitance of the variable capacity part is adjusted according to the control signal.
8 more elements
Dependencies are inferred from the claim text.