High linearity wide dynamic range radio frequency antenna switch
First Claim
1. A radio frequency (RF) antenna switch comprising:
- a plurality of switching transistor elements coupled in series to form a switching transistor element chain comprising;
an antenna connection node and a radio connection node at either end of the switching transistor element chain; and
at least one interconnection node where any two of the switching transistor elements are coupled; and
bias circuitry comprising;
a first bias network and a second bias network, which are coupled in series between the antenna connection node and the radio connection node, and provide an intermediate node between the first bias network and the second bias network; and
a bias conditioning circuit coupled between the intermediate node and one of the at least one interconnection nodes where any two of the switching transistor elements are coupled,wherein the bias circuitry is adapted to provide at least one signal path between the intermediate node and the at least one interconnection node where any two of the switching transistor elements are coupled in at least a first mode of operation, and at least one bias signal provided to the at least one interconnection node where any two of the switching transistor elements are coupled is based on an antenna signal at the antenna connection node and a radio signal at the radio connection node.
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Abstract
The present invention is a wide dynamic range antenna switch that, when disabled, has a stable input impedance over a wide power range. The wide dynamic range antenna switch includes multiple transistors, which are coupled in series, to provide a main signal path between an antenna connection and a radio connection. Direct current (DC) bias signals are provided to each of the transistors to ensure than when the antenna switch is disabled, the input impedance is stable. A control input, which may operate with low voltage control signals, enables or disables the antenna switch. The antenna switch may be coupled with other antenna switches in a communications system with multiple transceivers sharing a common antenna, and with a wide range of transmitter output power levels. Different embodiments of the present invention provide different DC bias circuit architectures.
64 Citations
20 Claims
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1. A radio frequency (RF) antenna switch comprising:
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a plurality of switching transistor elements coupled in series to form a switching transistor element chain comprising; an antenna connection node and a radio connection node at either end of the switching transistor element chain; and at least one interconnection node where any two of the switching transistor elements are coupled; and bias circuitry comprising; a first bias network and a second bias network, which are coupled in series between the antenna connection node and the radio connection node, and provide an intermediate node between the first bias network and the second bias network; and a bias conditioning circuit coupled between the intermediate node and one of the at least one interconnection nodes where any two of the switching transistor elements are coupled, wherein the bias circuitry is adapted to provide at least one signal path between the intermediate node and the at least one interconnection node where any two of the switching transistor elements are coupled in at least a first mode of operation, and at least one bias signal provided to the at least one interconnection node where any two of the switching transistor elements are coupled is based on an antenna signal at the antenna connection node and a radio signal at the radio connection node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification