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US 11,336,278 B2Granted
Switching circuit and high frequency module
AssigneeMurata Manufacturing Co., Ltd.
InventorMasashi Hayakawa
Life of this patent
Estimating the term…
Abstract
In a switching circuit, an inductance of an inductor of a shunt circuit is such that off capacitance of a second switching device that is in the off state when a first switching device is in the on state is used to define, in the shunt circuit, a series resonance circuit with a desired resonant frequency. Therefore, the frequency of an unnecessary signal to be attenuated is set to the resonant frequency of the series resonance circuit. Thus, the switching circuit achieves improved isolation characteristics with other circuits by attenuating the unnecessary signal.
Claims15
A switching circuit comprising:
- a first terminal;
- a plurality of second terminals;
- a third terminal;
- a plurality of first switching devices, each of the plurality of first switching devices being connected to the first terminal and connected in series to a corresponding one of a plurality of first signal paths coupling the first terminal to a corresponding one of the plurality of second terminals, and each of the plurality of first signal paths being connected to a corresponding one of the plurality of second terminals;
- a plurality of shunt circuits, each of the plurality of shunt circuits being connected between a corresponding one of the plurality of second terminals and a ground terminal;
- and
- a plurality of third switching devices, each of the plurality of third switching devices being connected to the third terminal and connected in series to a corresponding one of a plurality of second signal paths coupling the third terminal to a corresponding one of the plurality of second terminals, and each of the plurality of second signal paths being connected to a corresponding one of the plurality of second terminals;
- wherein
- each of the shunt circuits includes a second switching device and an inductor, the second switching device and the inductor being coupled to each other in series;
- the inductors of the shunt circuits have inductances different from one another;
- and
- the first terminal is to be connected to a first antenna and the third terminal is to be connected to a second antenna.
9 more elements
A high frequency module comprising:
- a switching circuit that includes:
- a first terminal;
- a plurality of second terminals;
- a third terminal;
- a plurality of first switching devices, each of the plurality of first switching devices being connected to the first terminal and connected in series to a corresponding one of a plurality of first signal paths coupling the first terminal to a corresponding one of the plurality of second terminals, and each of the plurality of first signal paths being connected to a corresponding one of the plurality of second terminals;
- a plurality of shunt circuits, each of the plurality of shunt circuits being disposcd connected between a corresponding one of the plurality of second terminals and a ground terminal;
- and
- a plurality of third switching devices, each of the plurality of third switching devices being connected to the third terminal and connected in series to a corresponding one of a plurality of second signal paths coupling the third terminal to a corresponding one of the plurality of second terminals, and each of the plurality of second signal paths being connected to a corresponding one of the plurality of second terminals;
- wherein
- each of the shunt circuits includes a second switching device and an inductor, the second switching device and the inductor being coupled to each other in series;
- the inductors of the shunt circuits have inductances different from one another;
- and
- the first terminal is to be connected to a first antenna and the third terminal is to be connected to a second antenna;
- and
- a multi-layer substrate including a first principal surface on which the first, second, and third switching devices are mounted.
12 more elements
A communication device comprising:
- a high frequency module that includes:
- a switching circuit including:
- a first terminal;
- a plurality of second terminals;
- a third terminal;
- a plurality of first switching devices, each of the plurality of first switching devices being connected to the first terminal and connected in series to a corresponding one of a plurality of first signal paths coupling the first terminal to a corresponding one of the plurality of second terminals, and each of the plurality of first signal paths being connected to a corresponding one of the plurality of second terminals;
- a plurality of shunt circuits, each of the plurality of shunt circuits being connected between a corresponding one of the plurality of second terminals and a ground terminal;
- and
- a plurality of third switching devices, each of the plurality of third switching devices being connected to the third terminal and connected in series to a corresponding one of a plurality of second signal paths coupling the third terminal to a corresponding one of the plurality of second terminals, and each of the plurality of second signal paths being connected to a corresponding one of the plurality of second terminals;
- wherein
- each of the shunt circuits includes a second switching device and an inductor, the second switching device and the inductor being coupled to each other in series;
- the inductors of the shunt circuits have inductances different from one another;
- and
- the first terminal is to be connected to a first antenna and the third terminal is to be connected to a second antenna;
- and
- a multi-layer substrate including a first principal surface on which the first, second, and third switching devices are mounted.
13 more elements
Dependencies are inferred from the claim text.