CMOS RF switch for high-performance radio systems
First Claim
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1. A switch, comprising:
- a first transistor serially connected to a second transistor;
a first resistor connected from a bias terminal to a source terminal of the first transistor, a second resistor connected from the bias terminal to a drain terminal of the first transistor and to a source terminal of the second transistor, and a third resistor connected from the bias terminal to a drain terminal of the second transistor; and
an inductor having a first terminal connected to the source terminal of the first transistor and a second terminal connected to the drain terminal of the second transistor.
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Abstract
A wireless device includes high-performance CMOS RF switches that include serially connected transistors coupled between an input terminal and an output terminal, with an inductor coupled from the input to the output that resonates out the capacitance of the transistors to improve isolation. The transistors have a floating/bootstrapped body with remote body contacts.
56 Citations
16 Claims
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1. A switch, comprising:
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a first transistor serially connected to a second transistor; a first resistor connected from a bias terminal to a source terminal of the first transistor, a second resistor connected from the bias terminal to a drain terminal of the first transistor and to a source terminal of the second transistor, and a third resistor connected from the bias terminal to a drain terminal of the second transistor; and an inductor having a first terminal connected to the source terminal of the first transistor and a second terminal connected to the drain terminal of the second transistor. - View Dependent Claims (2, 3, 4)
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5. A switch circuit, comprising:
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first and second serially connected transistors coupled between an input and an output, where the transistors have source and drain terminals coupled to a bias terminal via first, second and third resistors; and an inductor connected in parallel with the first and second serially connected transistors. - View Dependent Claims (6, 7)
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8. A radio comprising:
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an antenna; a transceiver; and a switch having an input coupled to the antenna and an output coupled to the transceiver, the switch including first and second serially connected transistors connected in parallel with an inductor between the input and the output, the switch further including first, second and third resistors connected to a bias terminal and to the source and drain terminals of the first and second transistors. - View Dependent Claims (9, 10, 11, 12)
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13. A method to demodulate an over-the-air signal, comprising:
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receiving the over-the-air signal at an antenna; providing the over-the-air signal from the antenna at an input terminal of a switch having first and second serially connected transistors coupled between the input terminal and an output terminal, where the first and second serially connected transistors have source and drain terminals coupled to a bias terminal via resistors; and controlling a DC voltage provided to gate terminals of the first and second serially connected transistors to be greater than a DC bias supplied at the bias terminal to set the switch to an on condition. - View Dependent Claims (14, 15, 16)
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Specification