Second order harmonic cancellation for radio frequency front-end switches
First Claim
1. A radio frequency switch circuit, comprising:
- an antenna port;
a plurality of signal ports;
a plurality of transistor switch circuits each connected to a respective one of the plurality of signal ports and to the antenna port, each of the transistor switch circuits including a transistor which in an off state, together with a harmonic suppression capacitor connected to the transistor and a parallel inductor connected across a source and a drain of the transistor, define a tank circuit that suppresses radio frequency signals applied to the corresponding transistor switch circuit from a different one of the transistor switch circuits, the harmonic suppression capacitors being tuned to distribute large signal voltage swings in the RF signal amongst parasitic diodes of the transistors.
6 Assignments
0 Petitions
Accused Products
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 RF signal amongst parasitic diodes of the transistor.
7 Citations
20 Claims
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1. A radio frequency switch circuit, comprising:
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an antenna port; a plurality of signal ports; a plurality of transistor switch circuits each connected to a respective one of the plurality of signal ports and to the antenna port, each of the transistor switch circuits including a transistor which in an off state, together with a harmonic suppression capacitor connected to the transistor and a parallel inductor connected across a source and a drain of the transistor, define a tank circuit that suppresses radio frequency signals applied to the corresponding transistor switch circuit from a different one of the transistor switch circuits, the harmonic suppression capacitors being tuned to distribute large signal voltage swings in the RF signal amongst parasitic diodes of the transistors. - 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