Thermally distributed darlington amplifier
AssigneeSirenza Microdevices, Inc.
InventorsKevin Wesley Kobayashi, Stephen Todd Fariss
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Abstract
A Darlington amplifier comprising a first stage and a second stage. The first stage generally comprises one or more first transistors and configured to generate a first and a second signal in response to an input signal. The second stage generally comprises one or more second transistors and may be configured to generate an output signal in response to the first and second signals. The Darlington amplifier may be configured to provide thermal emitter ballasting of the first transistors.
Claims31
A Darlington amplifier comprising:
- a first stage comprising a plurality of first transistors operating at a microwave frequency and configured to generate a plurality of signals in response to an input signal;
- and
- a second stage (i) having a physical separation from said first stage sufficient to reduce thermal sharing and (ii) comprising a plurality of second transistors configured to generate an output signal in response to said signals, wherein said amplifier is configured to provide thermal emitter ballasting of said first transistors.
A Darlington amplifier comprising:
- means for generating a plurality of signals in response to an input signal with a plurality first transistors operating at a microwave frequency;
- means for generating an output signal in response to said signals with a plurality of second transistors having a physical separation from said first transistors sufficient to reduce thermal sharing;
- and
- means for providing thermal emitter ballasting of said first transistors.
A method for providing a thermally distributed Darlington amplifier pair topology, comprising the steps of:
- (A) generating a plurality of signals in response to an input signal with a plurality of first transistors operating at a microwave frequency;
- (B) generating an output signal in response to said signals with a plurality of second transistors;
- (C) providing thermal emitter ballasting of said first transistors;
- and
- (D) reducing thermal sharing between said first transistors and said second transistors through a physical separation.
A circuit comprising:
- a plurality of first transistors having a common base and configured to generate a plurality of signals in response to an input signal;
- a plurality of second transistors having a physical separation from said first transistor to reduce thermal sharing and at least one common collector and configured to generate an output signal in response to said signals;
- and
- a plurality of resistors each in series between a node and an emitter among said first and said second transistors.
Dependencies are inferred from the claim text.