Second Order Harmonic Cancellation for Radio Frequency Front-End Switches
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Abstract
A radio frequency switch circuit with improved harmonic suppression and low insertion loss has an antenna port and a plurality of signal ports. A plurality of transistor switch circuits, are connected to a respective one of the plurality of signal ports and to the antenna port. Each of the transistor switch circuits has a transistor, which in an off state, together with a harmonic suppression capacitor and a parallel inductor both connected thereto, define a tank circuit that suppresses RF signals applied to the corresponding transistor switch circuit from a different one of the transistor switch circuits. The harmonic suppression capacitor is tuned to distribute large signal voltage swings in the RE signal amongst parasitic diodes of the transistor.
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Citations
40 Claims
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1-20. -20. (canceled)
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21. A radio frequency switch, comprising:
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an antenna port; a plurality of signal ports; a plurality of control line ports; and a plurality of transistor switch circuits each connected to a respective one of the plurality of signal ports, to a respective one of the control line ports, and to the antenna port, each of the transistor switch circuits including a transistor that defines a tank circuit for suppression of radio frequency signals applied to the corresponding transistor of a different one of the transistor switch circuits. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An antenna switch circuit, comprising:
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an antenna port; a plurality of signal ports; a plurality of transistors each including a gate, a source, a drain, and a body, the source of each of the plurality of transistors being connected to a respective one of the signal ports and the drain of each of the plurality of transistors being connected to the antenna port; a plurality of harmonic suppression capacitors each connected to the body and to the drain of each of the plurality of transistors; and a plurality of parallel inductors each connected to the source and to the drain of each of the plurality of transistors. - View Dependent Claims (32, 33, 34, 35)
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36. An antenna switch circuit, comprising:
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an antenna port; a plurality of signal ports; a plurality of transistors each including a gate, a source, a drain, and a body, one of the source and the drain of each of the plurality of transistors being connected to a respective one of the signal ports, and the other of the source and the drain of each of the plurality of transistors being connected to the antenna port; a plurality of harmonic suppression capacitors each connected to the body and to the drain of each of the plurality of transistors; and a plurality of parallel inductors each connected to the source and to the drain of each of the plurality of transistors. - View Dependent Claims (37, 38, 39, 40)
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Specification