MULTIMODE FRONTEND CIRCUIT
First Claim
1. A multimode frontend circuit comprising first, second and third ports, a first transmission path between the first and second ports, and a second transmission path between the first and third ports,each of the transmission paths comprising:
- two input/output lines;
a first transmission line having one end connected to one of the input/output lines and the other end connected to the other input/output line;
a second transmission line having one end connected to the one of the input/output lines and the other end connected to the other input/output line; and
one or a plurality of termination switch circuits;
wherein;
the electrical length of the first transmission line is equal to the electrical length of the second transmission line;
a characteristic impedance for an even mode and a characteristic impedance for an odd mode of the first transmission line are constant along the length of the first transmission line;
a characteristic impedance for an even mode and a characteristic impedance for an odd mode of the second transmission line are constant along the length of the second transmission line;
the characteristic impedance for the even mode of the first transmission line is equal to the characteristic impedance for the even mode of the second transmission line;
the characteristic impedance for the odd mode of the first transmission line is equal to the characteristic impedance for the odd mode of the second transmission line; and
each of the one or plurality of termination switch circuits comprises a switch and a termination circuit, one end of the switch being connected to one of the first and second transmission lines, the termination circuit being connected to the other end of the switch.
1 Assignment
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Accused Products
Abstract
A multimode frontend circuit of the present invention comprises two transmission paths. Each of the transmission paths comprises two input/output lines, a first transmission line having one end connected to one of the input/output lines and the other end connected to the other input/output line, a second transmission line connected to the one of the input/output lines and the other end connected to the other input/output line, and one or more termination switch circuits. The termination switch circuit or circuits comprise a switch having one end connected to one of the first and second transmission lines and a termination circuit connected to the other end of the switch. Each of the transmission lines may comprise one or more short-circuiting switches. The short-circuiting switch or switches are capable of short-circuiting between the two transmission lines at positions at the same electrical length from one of the input/output lines.
10 Citations
9 Claims
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1. A multimode frontend circuit comprising first, second and third ports, a first transmission path between the first and second ports, and a second transmission path between the first and third ports,
each of the transmission paths comprising: -
two input/output lines; a first transmission line having one end connected to one of the input/output lines and the other end connected to the other input/output line; a second transmission line having one end connected to the one of the input/output lines and the other end connected to the other input/output line; and one or a plurality of termination switch circuits; wherein; the electrical length of the first transmission line is equal to the electrical length of the second transmission line; a characteristic impedance for an even mode and a characteristic impedance for an odd mode of the first transmission line are constant along the length of the first transmission line; a characteristic impedance for an even mode and a characteristic impedance for an odd mode of the second transmission line are constant along the length of the second transmission line; the characteristic impedance for the even mode of the first transmission line is equal to the characteristic impedance for the even mode of the second transmission line; the characteristic impedance for the odd mode of the first transmission line is equal to the characteristic impedance for the odd mode of the second transmission line; and each of the one or plurality of termination switch circuits comprises a switch and a termination circuit, one end of the switch being connected to one of the first and second transmission lines, the termination circuit being connected to the other end of the switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification