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US 11,616,504 B2Granted
OPAMP overload power limit circuit, system, and a method thereof
AssigneeTexas Instruments Incorporated
InventorsSudarshan Udayashankar, Martijn Fridus Snoeij
Life of this patent
Estimating the term…
Abstract
An amplifier overload power limit circuit, system, and a method thereof comprising a monitoring of a current gain of a BJT based on a current detector and limiting power to the BJT based on the monitored current gain to prevent the BJT from driven into a saturation mode and the amplifier overdrive.
Claims20
A circuit comprising:
- a bipolar junction transistor (BJT) amplifier comprising:
- a BJT;
- and
- an amplifier coupled to the BJT;
- a current detector coupled to the BJT and to the amplifier;
- and
- a limiting circuit coupled to the amplifier and to the current detector.
4 more elements
A circuit comprising,
- a bipolar junction transistor (BJT) amplifier comprising a first BJT;
- a limiting circuit coupled to the BJT amplifier;
- and
- a current detector coupled to the BJT amplifier and to the limiting circuit, the current detector comprising:
- a base current sensor coupled to a base of the BJT;
- an emitter current sensor coupled to an emitter of the BJT;
- and
- a comparator coupled to the base current sensor, to the emitter current sensor, and to the limiting circuit, the comparator comprising:
- a second BJT coupled to the emitter current sensor;
- and
- a third BJT coupled to the base current sensor and to the limiting circuit.
8 more elements
A circuit comprising:
- a transistor having a first current terminal, a second current terminal, and a control terminal;
- an amplifier coupled to the control terminal;
- a first current sensor coupled to the first current terminal;
- a second current sensor coupled to the amplifier;
- a switch coupled to the amplifier;
- and
- a comparator coupled to the first current sensor, to the second current sensor, and to the switch.
4 more elements
Dependencies are inferred from the claim text.