Notch filter for wireless circuitry
AssigneeApple Inc.
InventorsMilad Darvishi, Abbas Komijani
Life of this patent
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Abstract
Wireless circuitry can include one or more notch filters. A notch filter can include a series inductor having a first terminal coupled to an input and having a second terminal coupled to an output, a first series capacitor having a first terminal coupled to the input and having a second terminal coupled to a node, a second series capacitor having a first terminal coupled to the output and having a second terminal coupled to the node, and a shunt resistor having a first terminal coupled to the node and having a second terminal coupled to a ground line. The notch filter can further include a shunt capacitor coupled in series with the shunt resistor between the node and the ground line. The shunt resistor can be a tunable resistor.
Claims17
A filter circuit comprising:
- a first component of a first type coupled between a filter input port and a filter output port;
- a second component of a second type, different than the first type, having a first terminal coupled to the filter input port and having a second terminal coupled to a node;
- a third component of a third type, different than the first and second types, having a first terminal coupled to the node and having a second terminal coupled to a power supply line;
- and
- a shunt capacitor, separate from the second component, having a first terminal coupled to the node and a second terminal coupled to the first terminal of the third component.
A notch filter comprising:
- a series inductor having a first terminal coupled to an input and having a second terminal coupled to an output;
- a first series capacitor having a first terminal coupled to the input and having a second terminal coupled to a node;
- a second series capacitor having a first terminal coupled to the output and having a second terminal coupled to the node;
- a shunt resistor, separate from the first and second series capacitors, having a first terminal coupled to the node and having a second terminal coupled to a ground line;
- and
- a shunt capacitor, separate from the first and second series capacitors, coupled in series with the shunt resistor between the node and the ground line.
A notch filter comprising:
- a series inductor having a first terminal coupled to an input and having a second terminal coupled to an output;
- a first series capacitor having a first terminal coupled to the input and having a second terminal coupled to a node;
- a second series capacitor having a first terminal coupled to the output and having a second terminal coupled to the node;
- and
- an adjustable shunt resistor having a first terminal directly coupled to the node and having a second terminal coupled to ground.
Dependencies are inferred from the claim text.