Radio-frequency switch system having improved intermodulation distortion performance
DCFirst Claim
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1. A radio-frequency (RF) switch system comprising:
- a first switch circuit connected between an antenna node and a transmit node;
a second switch circuit connected between the antenna node and a receive node;
a first capacitor connected in series with the first switch circuit between the first switch circuit and the antenna node;
a second capacitor connected in series with the second switch circuit between the second switch circuit and the antenna node;
a first shunt arm connected to the first switch circuit and the transmit node, the first shunt arm including a third switch circuit connected to ground; and
a second shunt arm connected to the second switch circuit and the receive node, the second shunt arm including a fourth switch circuit connected to ground.
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Abstract
Radio-frequency (RF) switch circuits are disclosed providing improved switching performance. An RF switch system includes a switch having a stack of field-effect transistors (FETs) connected in series between first and second nodes. A capacitor connected in series with the switch is configured to inhibit a low-frequency blocker signal from mixing with a fundamental-frequency signal in the switch.
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Citations
11 Claims
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1. A radio-frequency (RF) switch system comprising:
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a first switch circuit connected between an antenna node and a transmit node; a second switch circuit connected between the antenna node and a receive node; a first capacitor connected in series with the first switch circuit between the first switch circuit and the antenna node; a second capacitor connected in series with the second switch circuit between the second switch circuit and the antenna node; a first shunt arm connected to the first switch circuit and the transmit node, the first shunt arm including a third switch circuit connected to ground; and a second shunt arm connected to the second switch circuit and the receive node, the second shunt arm including a fourth switch circuit connected to ground. - View Dependent Claims (2, 3)
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4. A radio-frequency (RF) switch system comprising:
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a first switch circuit connected between an antenna node and a transmit node; a second switch circuit connected between the antenna node and a receive node; a first capacitor connected in series with the first switch circuit between the first switch circuit and the antenna node; a second capacitor connected in series with the second switch circuit between the second switch circuit and the antenna node; a first shunt arm connected to the first switch circuit and the transmit node, the first shunt arm including a third switch circuit connected to ground and a third capacitor connected between the third switch circuit and the transmit node.
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5. A method for fabricating a semiconductor die, the method comprising:
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providing a semiconductor substrate; forming a first switch circuit on the semiconductor substrate so as to be connected between an antenna node and a transmit node; forming a second switch circuit on the semiconductor substrate so as to be connected between the antenna node and a receive node; forming a first capacitor on the semiconductor substrate so as to be connected in series with the first switch circuit between the first switch circuit and the antenna node; forming a second capacitor on the semiconductor substrate so as to be connected in series with the second switch circuit between the second switch circuit and the antenna node; forming a first shunt arm connected to the first switch circuit and the transmit node, the first shunt arm including a third switch circuit connected to ground; and forming a second shunt arm connected to the second switch circuit and the receive node, the second shunt arm including a fourth switch circuit connected to ground. - View Dependent Claims (6)
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7. A radio-frequency (RF) switch module comprising:
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a packaging substrate configured to receive a plurality of components; a semiconductor die mounted on the packaging substrate, the die including a first switch circuit connected between an antenna node and a transmit node and a second switch circuit connected between the antenna node and a receive node; a first capacitor connected in series with the first switch circuit between the first switch circuit and the antenna node; a second capacitor connected in series with the second switch circuit between the second switch circuit and the antenna node; a first shunt arm connected to the first switch circuit and the transmit node, the first shunt arm including a third switch circuit connected to ground; and a second shunt arm connected to the second switch circuit and the receive node, the second shunt arm including a fourth switch circuit connected to ground. - View Dependent Claims (8, 9, 10, 11)
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Specification