Linearity radio frequency switch with low control voltage
AssigneeAnadigics, Inc.
InventorsBrian Scott Arnold, Steven William Cooper
Life of this patent
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Abstract
A field effect transistor used in radio frequency switching applications and having a linear performance characteristic is disclosed. The transistor comprises a plurality of gate lines, a source terminal, a drain terminal, and two feed forward capacitors electrically coupled to the source and drain terminals and the gate line at a plurality of points along the line. An improved transistor preferably includes three or more gate lines to help improve harmonic suppression.
Claims20
A field effect transistor comprising:
- a plurality of gate lines,
- a source terminal electrically coupled to a source finger,
- a drain terminal electrically coupled to a drain finger,
- a first end of a first feed forward capacitor electrically coupled to the source terminal and at a second end electrically coupled to at least one gate line at a first plurality of points along the at least one gate line, and,
- a first end of a second feed forward capacitor electrically coupled to the drain terminal and at a second end electrically coupled to the at least one gate line at a second plurality of points along the at least one gate line.
A method of switching a radio frequency signal having a signal strength of greater than 24 dBm and preferably up to 35.5 dBm, comprising:
- providing a field effect transistor as a series switching device, the transistor comprising:
- a plurality of gate lines,
- a source terminal electrically coupled to a source finger,
- a drain terminal electrically coupled to a drain finger,
- a first end of a first feed forward capacitor electrically coupled to the source terminal and at a second end electrically coupled to at least one gate line at a first plurality of points along the line, and,
- a first end of a second feed forward capacitor electrically coupled to the drain terminal and at a second end electrically coupled to at least one gate line at a second plurality of points along the line.
Dependencies are inferred from the claim text.