Mems-tuned high power, high efficiency, wide bandwidth power amplifier
First Claim
1. A circuit for matching the impedance of an output load to an active device comprising:
- a transformer comprising;
a first winding having a terminal for coupling to the output of the active device;
a second winding electromagnetically coupled to the first winding; and
a plurality of taps, each of the plurality of taps having a first end, coupled to a position disposed on the second winding corresponding to a ratio of the second winding to first winding differing from other ones of the plurality of taps, and a second end; and
a plurality of MEMS switches each having a control input for receiving a corresponding control signal, a first terminal coupled to the second end of a corresponding one of the plurality of taps, and a switched output selectively coupled to a matching junction in response to the corresponding control signal.
1 Assignment
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Accused Products
Abstract
A circuit for matching the impedance of an output load to an active device includes a transformer including a first winding having a terminal for coupling to the output of the active device and a second winding electromagnetically coupled to the first winding, and a plurality of taps, each of the plurality of taps having a first end coupled to a position on the second winding corresponding to a ratio of the second winding to first winding differing from other ones of the plurality of taps, and a second end. The matching circuit further includes a plurality of MEMS switches each having a control input for receiving a corresponding control signal, a first terminal coupled to the second end of a corresponding one of the plurality of taps, and a switched output selectively coupled to a matching junction in response to the corresponding control signal.
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Citations
23 Claims
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1. A circuit for matching the impedance of an output load to an active device comprising:
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a transformer comprising;
a first winding having a terminal for coupling to the output of the active device;
a second winding electromagnetically coupled to the first winding; and
a plurality of taps, each of the plurality of taps having a first end, coupled to a position disposed on the second winding corresponding to a ratio of the second winding to first winding differing from other ones of the plurality of taps, and a second end; and
a plurality of MEMS switches each having a control input for receiving a corresponding control signal, a first terminal coupled to the second end of a corresponding one of the plurality of taps, and a switched output selectively coupled to a matching junction in response to the corresponding control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An amplifier comprising:
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an active device having an input for receiving an RF signal and an output;
a transformer having a first winding coupled to the output of the active device, and a second winding having a transformer output;
at least one tap having a first end coupled to the secondary winding and a second end; and
at least one MEMS switch having a control input for receiving a control signal, a switch input coupled to the second end of the at least one tap, and a switched output selectively coupled to the transformer output in response to the control signal.
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17. An amplifier comprising:
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an active device having an input for receiving an RF signal and an output;
a transformer having a first winding coupled to the active device output, and a second winding providing a transformer output;
a plurality of transformer taps each having a first end coupled to the second winding and each corresponding to a different ratio of the second winding to first winding; and
a plurality of MEMS switches each coupled between a corresponding one of the plurality of transformer taps and a matching junction, and each of the plurality of MEMS switches having a control input for receiving a corresponding control signal for changing the impedance of the transformer in response to the control signal. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification