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US 11,405,003 B1Granted
Extended feedback gain tuning in TIA based current amplifier or mixer
AssigneeBAE Systems Information and Electronic Systems Integration Inc.
InventorGregory M. Flewelling
Life of this patent
Estimating the term…
Abstract
A transimpedance amplifier (TIA) device design is disclosed. Symmetric components include first and second resistors Ri, Rfb, Re, Rm, Rx, Rc, and Rl, and transistors Q1-Q4. An optional mixer or cascode adds transistors Q5-Q8. Values for resistor components Rx provide extended feedback gain tuning in a TIA-based current amplifier or mixer implementations without greatly affecting the input impedance or requiring more attenuators. Example values for resistor components Rx range from about 50 to about 350 ohms.
Claims20
A transimpedance amplifier device comprising:
- a first circuit half and a second circuit half;
- said first circuit half comprising:
- a first Ri resistor in electrical connection with a base of a transistor Q1 and a first Rfb resistor;
- said first Rfb resistor in electrical connection with a first Re resistor, a first Rm resistor, a first Rx resistor, and an emitter of a transistor Q2, said first Re resistor is also in electrical connection with a ground, an emitter of said transistor Q1 is also in electrical connection with said ground, a collector of said transistor Q1 is in electrical connection with a base of said transistor Q2 and a first Rc resistor, first Rc resistor is also in electrical connection with a first Rl resistor, a collector of said transistor Q2 is in electrical communication with the end of said first Rl resistor opposite the end in electrical communication with said first Rc resistor;
- said second circuit half comprising:
- a second Ri resistor in electrical connection with a base of a transistor Q4 and a second Rfb resistor, a second Rfb resistor in electrical connection with a second Re resistor, a second Rm resistor, a second Rx resistor, and an emitter of a transistor Q3, said second Re resistor is also in electrical connection with said ground, an emitter of a transistor Q4 is also in electrical connection with said ground, a collector of said transistor Q4 is in electrical connection with a base of said transistor Q3 and a second Rc resistor, said second Rc resistor is also in electrical connection with a second Rl resistor, a collector of said transistor Q3 is in electrical communication with the end of said second Rl resistor opposite the end in electrical communication with said second Rc resistor;
- wherein a second Ri resistor in electrical connection with a base of said transistor Q4 and a second Rfb resistor, said second Rfb resistor is in electrical connection with a second Re resistor, a second Rm resistor, a second Rx resistor, and an emitter of said transistor Q3, said second Re resistor is also in electrical connection with said ground, emitter of said transistor Q4 is also in electrical connection with said ground, a collector of said transistor Q4 is in electrical connection with a base of said transistor Q3 and a second Rc resistor, said second Rc resistor is also in electrical connection with a second Rl resistor;
- and
- said first half and said second half are in electrical communication between said first Rx resistor and said second Rx resistor, and between said first resistor, and said second resistor.
6 more elements
A transimpedance amplifier device comprising:
- a first circuit half, a second circuit half, and a mixer;
- said first circuit half comprising:
- a first Ri resistor in electrical connection with a base of a transistor Q1 and a first Rfb resistor;
- said first Rfb resistor in electrical connection with a first Re resistor, a first Rm resistor, a first Rx resistor, and an emitter of a transistor Q2, said first Re resistor is also in electrical connection with a ground, an emitter of said transistor Q1 is also in electrical connection with said ground, a collector of said transistor Q1 is in electrical connection with a base of said transistor Q2 and a first Rc resistor, first Rx resistor is also in electrical connection with a first Rl resistor;
- said second circuit half comprising:
- a second Ri resistor in electrical connection with a base of a transistor Q4 and a second Rfb resistor, a second Rfb resistor in electrical connection with a second Re resistor, a second Rm resistor, a second Rx resistor, and an emitter of a transistor Q3, said second Re resistor is also in electrical connection with said ground, an emitter of a transistor Q4 is also in electrical connection with said ground, a collector of said transistor Q4 is in electrical connection with a base of said transistor Q3 and a second Rc resistor, said second Rc resistor is also in electrical connection with a second Rl resistor;
- and
- said mixer comprising:
- transistors Q5, Q6, Q7, and Q8, wherein a base of said transistor Q6 and a base of said transistor Q7, a base of said transistor Q5 and a base of said transistor Q8, a collector of said transistor Q6 and a collector of said transistor Q8, and a collector of said transistor Q5 and a collector of said transistor Q7 are connected, a collector of said transistor Q3 is in electrical communication with an emitter of said transistor Q8 and with an emitter of said transistor Q7, a collector of said transistor Q7 is also in electrical communication with said second Rl resistor, opposite the end in electrical connection with said second Rc resistor.
6 more elements
A transimpedance amplifier device comprising:
- a first circuit half, a second circuit half, and a cascode;
- said first circuit half comprising:
- a first Ri resistor in electrical connection with a base of a transistor Q1 and a first Rfb resistor;
- said first Rfb resistor in electrical connection with a first Re resistor, a first Rm resistor, a first Rx resistor, and an emitter of a transistor Q2, said first Re resistor is also in electrical connection with a ground, an emitter of said transistor Q1 is also in electrical connection with said ground, a collector of said transistor Q1 is in electrical connection with a base of said transistor Q2 and a first Rc resistor, first Rc resistor is also in electrical connection with a first Rl resistor;
- said second circuit half comprising:
- a second Ri resistor in electrical connection with a base of a transistor Q4 and a second Rfb resistor, a second Rfb resistor in electrical connection with a second Re resistor, a second Rm resistor, a second Rx resistor, and an emitter of a transistor Q3, said second Re resistor is also in electrical connection with said ground, an emitter of a transistor Q4 is also in electrical connection with said ground, a collector of said transistor Q4 is in electrical connection with a base of said transistor Q3 and a second Rc resistor, said second Rc resistor is also in electrical connection with a second Rl resistor;
- and
- said cascode comprising:
- transistors Q5, Q6, Q7, and Q8, wherein a base of said transistor Q6 and a base of said transistor Q7, a base of said transistor Q5 and a base of said transistor Q8, a collector of said transistor Q6 and a collector of said transistor Q8, and a collector of said transistor Q5 and a collector of said transistor Q7 are connected, a collector of said transistor Q3 is in electrical communication with an emitter of said transistor Q8 and with an emitter of said transistor Q7, a collector of said transistor Q7 is also in electrical communication with said second Rl resistor, opposite the end in electrical connection with said second Rc resistor.
6 more elements
Dependencies are inferred from the claim text.