Radio transceiver circuit
First Claim
1. A radio transceiver circuit comprising:
- a first amplifier for amplifying signals received from an antenna via an antenna connection;
a second amplifier for amplifying signals to be transmitted by the antenna via the antenna connection, wherein the second amplifier is operable to amplify signals to be transmitted according to a first wireless communications standard, and further comprising a third amplifier operable to amplify signals to be transmitted according to a second wireless communications standard by the antenna via the antenna connection; and
a switching circuit connected between an input of the first amplifier and the antenna connection, the switching circuit comprising a capacitive circuit including a capacitor, a switching element and an impedance matching element that is configured to connect a node between the capacitor and the impedance matching element to a signal ground when the transceiver is in a transmit mode, wherein the switching element and the impedance matching element are configured and arranged to transform an input impedance of the first amplifier to an impedance, looking into the impedance matching circuit from the node, when the transceiver is in a transmit mode and based on whether the second amplifier or the third amplifier is operable to amplify signals to be transmitted in accordance with the first wireless communications standard or the second wireless communications standard.
2 Assignments
0 Petitions
Accused Products
Abstract
The disclosure relates to transceivers incorporating a transmit-receive switching circuit, embodiments of which include a radio transceiver circuit comprising: a first amplifier for amplifying signals received from an antenna via an antenna connection; a second amplifier for amplifying signals to be transmitted by the antenna via the antenna connection; and a switching circuit connected between an input of the first amplifier and the antenna connection, the switching circuit comprising a capacitor, a switching element and an impedance matching element, wherein the switching element is configured to connect a node between the capacitor and the impedance matching element to a signal ground when the transceiver is in a transmit mode.
8 Citations
19 Claims
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1. A radio transceiver circuit comprising:
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a first amplifier for amplifying signals received from an antenna via an antenna connection; a second amplifier for amplifying signals to be transmitted by the antenna via the antenna connection, wherein the second amplifier is operable to amplify signals to be transmitted according to a first wireless communications standard, and further comprising a third amplifier operable to amplify signals to be transmitted according to a second wireless communications standard by the antenna via the antenna connection; and a switching circuit connected between an input of the first amplifier and the antenna connection, the switching circuit comprising a capacitive circuit including a capacitor, a switching element and an impedance matching element that is configured to connect a node between the capacitor and the impedance matching element to a signal ground when the transceiver is in a transmit mode, wherein the switching element and the impedance matching element are configured and arranged to transform an input impedance of the first amplifier to an impedance, looking into the impedance matching circuit from the node, when the transceiver is in a transmit mode and based on whether the second amplifier or the third amplifier is operable to amplify signals to be transmitted in accordance with the first wireless communications standard or the second wireless communications standard. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radio transceiver circuit comprising:
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a first amplifier for amplifying signals received from an antenna via an antenna connection; a second amplifier for amplifying signals to be transmitted by the antenna via the antenna connection; and a switching circuit connected between an input of the first amplifier and the antenna connection, the switching circuit comprising a capacitive circuit including a capacitor, a switching element and an impedance matching element that is configured to connect a node between the capacitor and the impedance matching element to a signal ground when the transceiver is in a transmit mode, wherein the impedance matching element transforms an input impedance of the first amplifier to an impedance looking into the impedance matching circuit from the node that is a complex conjugate of an impedance looking into a capacitive circuit having the capacitor from the node.
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10. A radio transceiver circuit comprising:
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a first amplifier configured and arranged to amplify signals received from an antenna via an antenna connection; a second amplifier configured and arranged to amplify signals to be transmitted by the antenna via the antenna connection and to amplify signals to be transmitted according to a first wireless communications standard; a switching circuit connected between an input of the first amplifier and the antenna connection, the switching circuit comprising a capacitor, an impedance matching element, and a switching element that is configured to connect a node between the capacitor and the impedance matching element to a signal ground when the transceiver is in a transmit mode; and a third amplifier configured and arranged to amplify signals to be transmitted according to a second wireless communications standard by the antenna via the antenna connection, wherein an output of the third amplifier is connected between the impedance matching element and the input of the first receiving amplifier.
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11. A radio transceiver circuit comprising:
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a first amplifier for amplifying signals received from an antenna via an antenna connection; a second amplifier for amplifying signals to be transmitted according to a first wireless communications standard by the antenna via the antenna connection a third amplifier for amplifying signals to be transmitted according to a second wireless communications standard by the antenna via the antenna connection; a switching circuit connected between an input of the first amplifier and the antenna connection, the switching circuit comprising a capacitor, a switching element and an impedance matching element; wherein the switching element is configured to connect a node between the capacitor and the impedance matching element to a signal ground when the transceiver is in a transmit mode; and a fourth amplifier operable to amplify signals to be transmitted according to the second wireless communications standard by the antenna via the antenna connection, wherein an output of the fourth amplifier is connected to the node between the impedance matching element and the capacitor. - View Dependent Claims (12, 13, 14)
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15. A radio transceiver circuit comprising:
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a first amplifier for amplifying signals received from an antenna via an antenna connection; a second amplifier for amplifying signals to be transmitted by the antenna via the antenna connection; a switching circuit connected between an input of the first amplifier and the antenna connection, the switching circuit comprising a capacitor, a switching element and an impedance matching element; wherein the switching element is configured to connect a node between the capacitor and the impedance matching element to a signal ground when the transceiver is in a transmit mode; wherein the impedance matching element transforms an input impedance of the first amplifier to an impedance looking into the impedance matching circuit from the node that is a complex conjugate of an impedance looking into the capacitor from the node; and wherein the second amplifier is operable to amplify signals to be transmitted according to a first wireless communications standard, and further comprising a third amplifier operable to amplify signals to be transmitted according to a second wireless communications standard by the antenna via the antenna connection. - View Dependent Claims (16, 17, 18)
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19. A method for using a radio transceiver circuit, the method comprising:
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amplifying signals, through a first amplifier, received from an antenna via an antenna connection; amplifying signals, through a second amplifier or through a third amplifier, to be transmitted respectively according to a first wireless communications standard or a second wireless communications standard by the antenna via the antenna connection; and providing a switching circuit connected between an input of the first amplifier and the antenna connection, the switching circuit comprising a capacitive circuit having a capacitor, a switching element and an impedance matching element, and controlling the switching element to connect a node between the capacitor and the impedance matching element to a signal ground when the transceiver is in a transmit mode, wherein the switching element and the impedance matching element are configured and arranged to transform an input impedance of the first amplifier to an impedance, looking into the impedance matching circuit from the node, when the transceiver is in a transmit mode and based on whether the second amplifier or third amplifier is operable to amplify signals to be transmitted, the first wireless communications standard being different than the second wireless communications standard based at least on range of wireless connectivity.
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Specification