First coupling transformer secondary winding coupling second transmitter to antenna
First Claim
1. A device comprising:
- an antenna;
a first transmitter to generate a first transmit signal on a first output node, a first coupling network that includes a transformer having a primary winding coupled to the first output node and a secondary winding coupled to the antenna;
a second transmitter to generate a second transmit signal on a second output node, the second output node being coupled to the antenna via a series connection of a second coupling network and at least a portion of the first coupling network that includes the transformer secondary winding, the first transmitter and the second transmitter operating according to time-division multiple access (TDMA) techniques; and
the first coupling network including;
a first capacitor having a first terminal and a second terminal, the first terminal of the first capacitor is coupled to the antenna and a first terminal of the secondary winding of the transformer;
a first switch coupled between the second terminal of the first capacitor and a constant reference potential; and
a second switch is coupled between a second terminal of the secondary winding of the transformer and the constant reference potential.
1 Assignment
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Accused Products
Abstract
A device includes multiple transceivers, a coupling block and an antenna. The transceivers operate according to time-division multiple access (TDMA) techniques. The coupling block is designed to enable the multiple transceivers to transmit or receive corresponding signals using the antenna. The multiple transceivers include a first transmitter and a second transmitter. The first transmitter is connected to the antenna via a first coupling network. The second transmitter is connected to the antenna via a series connection of a second coupling network and at least a portion of the first coupling network. Other transmitters are connected to the antenna via a series arrangement of at least a portion of the first coupling network and corresponding coupling networks.
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Citations
21 Claims
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1. A device comprising:
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an antenna; a first transmitter to generate a first transmit signal on a first output node, a first coupling network that includes a transformer having a primary winding coupled to the first output node and a secondary winding coupled to the antenna; a second transmitter to generate a second transmit signal on a second output node, the second output node being coupled to the antenna via a series connection of a second coupling network and at least a portion of the first coupling network that includes the transformer secondary winding, the first transmitter and the second transmitter operating according to time-division multiple access (TDMA) techniques; and the first coupling network including; a first capacitor having a first terminal and a second terminal, the first terminal of the first capacitor is coupled to the antenna and a first terminal of the secondary winding of the transformer; a first switch coupled between the second terminal of the first capacitor and a constant reference potential; and a second switch is coupled between a second terminal of the secondary winding of the transformer and the constant reference potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A circuit for connecting multiple transmitters to an antenna, the circuit comprising:
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coupling networks including a first coupling network and a second coupling network, in which the first coupling network includes; a transformer, in which a primary winding of the transformer is coupled to receive an output of a first transmitter; a first capacitor, in which a first terminal of the first capacitor is coupled to the antenna and a first terminal of a secondary winding of the transformer; a first switch, in which the first switch is coupled between a second terminal of the first capacitor and a constant reference potential; and a second switch, in which the second switch is coupled between a second terminal of the secondary winding of the transformer and the constant reference potential, in which the second coupling network includes; a third switch coupled between a first output node of a second transmitter and the constant reference potential; a first inductor, in which a first terminal of the first inductor is coupled to the first output node; a second capacitor, in which a first terminal of the second capacitor is coupled to a second terminal of the first inductor; a fourth switch coupled between a second terminal of the second capacitor and the constant reference potential; and a second inductor, in which a first terminal of the second inductor is coupled to the first terminal of the second capacitor, a second terminal of the second inductor being coupled to the second terminal of the secondary winding of the transformer. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A circuit comprising:
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an antenna; a first transceiver including a first transmitter and a first receiver, a first node coupled to each of an output of the first transmitter and an input of the first receiver; a second transceiver including a second transmitter and a second receiver, a second node coupled to an output of the second transmitter via a transformer, the second node coupled to an input of the second receiver via a first capacitor; a first switch and a second switch; and a coupling network including a second capacitor, a third capacitor, a fourth capacitor and an inductor, in which the antenna is coupled to the second node, in which the first node is coupled to the antenna via a series arrangement of the fourth capacitor and the inductor, in which the fifth capacitor is coupled between the first node and a constant reference potential, and the third capacitor is coupled between the second node and the constant reference potential, in which, in transmission time slots of the second transmitter, each of the first switch and the second switch is closed, in which, in receive time slots of the second receiver, the first switch is closed and the second switch is open, and in which, in transmission time slots of the first transmitter as well as in receive time slots of the first receiver, the first switch is open. - View Dependent Claims (19)
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20. A circuit comprising:
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an antenna; a first transceiver including a first transmitter and a first receiver, a first node coupled to each of an output of the first transmitter and an input of the first receiver; a second transceiver including a second transmitter and a second receiver, a second node coupled to an output of the second transmitter via a transformer, the second node also connected to an input of the second receiver;
a switch coupled between the first node and a constant reference potential; anda coupling network including a first capacitor, a second capacitor, a third capacitor, a first inductor and a second inductor, in which the antenna is coupled to the second node via the first inductor, in which the first capacitor is coupled between the second node and the constant reference potential, in which the second capacitor is coupled between an input of the antenna and the constant reference potential, in which the second inductor is coupled between the first node and the input of the antenna, in which the third capacitor is coupled between the first node and the constant reference potential, in which, in transmission time slots of the first transmitter as well as in receive time slots of the first receiver, the first switch is open, and in which, in transmission time slots of the second transmitter as well as in receive time slots of the second receiver, the first switch is closed. - View Dependent Claims (21)
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Specification