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US 12,191,836 B2Granted
Bandpass filter, touch driver including the same, and method of bandpass filtering
AssigneeSamsung Display Co., Ltd.
InventorMoon Jae Jeong
Life of this patent
Estimating the term…
Abstract
A bandpass filter comprises first and second input terminals configured to receive a plurality of radio frequency signals having a phase difference, first and second load resistors connected in series to the first and second input terminals, respectively, a first switching unit connected in series to the first and second load resistors, a capacitor unit connected in series to the first switching unit, a second switching unit connected between the capacitor unit and a ground, and first and second output terminals connected between the first switching unit and the first and second load resistors, respectively.
Claims21
A bandpass filter comprising:
- a first input terminal and a second input terminal, the first input terminal configured to receive a first radio frequency signal having a first phase and the second input terminal configured to receive a second radio frequency signal having a second phase different from the first phase;
- a first load resistor connected in series to the first input terminal;
- a second load resistor connected in series to the second input terminal;
- a first switching unit connected in series to the first load resistor and the second load resistor;
- a capacitor unit connected in series to the first switching unit;
- a second switching unit connected between the capacitor unit and a ground;
- a first output terminal connected between the first switching unit and the first load resistor;
- and
- a second output terminal connected between the first switching unit and the second load resistor.
6 more elements
A bandpass filter comprising:
- first input terminal configured to receive a first radio frequency signal having a first phase and second input terminal configured to receive a second radio frequency signal having a second phase different from the first phase;
- a first load resistor connected in series to the first input terminal;
- a second load resistor connected in series to the second input terminal;
- a first switching unit configured to connect the first load resistor or the second load resistor to each of a plurality of paths;
- a capacitor unit disposed on each of the plurality of paths and connected to the first switching unit;
- and
- a second switching unit disposed on each of the plurality of paths and connected between the capacitor unit and a ground.
4 more elements
A touch driver comprising:
- a bandpass filter configured to receive a radio frequency signal and filter a specific frequency band;
- a first mixer configured to receive an output of the bandpass filter and output frequency signals having a first phase and a second phase opposite to the first phase;
- a second mixer configured to receive an output of the bandpass filter and output frequency signals having a third phase different from the first phase and a fourth phase opposite to the third phase;
- and
- a complex bandpass filter configured to receive outputs of the first and second mixers and select and output one of a positive frequency component and a negative frequency component,
- wherein the complex bandpass filter comprises:
- a first input terminal and a second input terminal, the first input terminal and the second input terminal configured to receive a plurality of radio frequency signals having a phase difference;
- a first load resistor connected in series to the first input terminal;
- a second load resistor connected in series to the second input terminal;
- a first switching unit connected in series to the first load resistor and the second load resistor;
- a capacitor unit connected in series to the first switching unit;
- a second switching unit connected between the capacitor unit and a ground;
- a first output terminal connected between the first switching unit and the first load resistor;
- and
- a second output terminal connected between the first switching unit and the second load resistor.
12 more elements
A method comprising:
- receiving a plurality of radio frequency signals using at least two input terminals including a first input terminal configured to receive a positive frequency component having a first phase and a second input terminal configured to receive a negative frequency component having a second phase opposite to the first phase;
- selecting one of the positive frequency component and the negative frequency component using a circuit comprising:
- at least two load resistors connected in series to the at least two input terminals;
- a first switching unit connected in series to the at least two load resistors;
- a capacitor unit connected in series to the first switching unit;
- a second switching unit connected between the capacitor unit and a ground;
- and
- outputting the selected one of the positive frequency component and the negative frequency component using at least two output terminals, the at least two output terminals connected between the first switching unit and the at least two load resistors.
5 more elements
Dependencies are inferred from the claim text.