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US 12,483,205 B2Granted
Power amplifier junction temperature clamp
AssigneeSkyworks Solutions, Inc.
InventorPhilip John Lehtola
Life of this patent
Estimating the term…
Abstract
A clamp circuit comprises a first diode stack comprising one or more diodes and an array comprising a second diode stack comprising one or more diodes and a comparator configured to compare a first voltage at the first diode stack to a second voltage at the second diode stack.
Claims13
A clamp circuit comprising:
- a first diode stack comprising one or more diodes;
- and
- an array comprising:
- a second diode stack comprising one or more diodes;
- and
- a comparator configured to compare a first voltage at the first diode stack to a second voltage at the second diode stack, the comparator including a first voltage source, a first transistor, a second transistor, a third transistor, and a fourth transistor, a base of the third transistor being coupled to a base of the fourth transistor.
3 more elements
A method comprising:
- placing a first diode network within a power amplifier array;
- placing a second diode network outside the power amplifier array, the second diode network having an area, current, and resistance configured to match voltage at the second diode network to the first diode network at normal operating conditions;
- and
- placing a comparator between the first diode network and the second diode network to maintain approximately matched voltage at the first diode network and the second diode network, the comparator including a first voltage source, a first transistor, a second transistor, a third transistor, and a fourth transistor, a base of the third transistor being coupled to a base of the fourth transistor.
1 more element
A circuit comprising:
- a controller configured to drive a current;
- and
- a power amplifier configured to receive the current from the controller, the power amplifier comprising:
- an array comprising one or more transistors;
- a first diode stack that is thermally isolated from the array;
- a second diode stack that is thermally coupled to the array and configured to receive a voltage approximately equal to a voltage of the array;
- and
- a comparator coupled between the first diode stack and the second diode stack and configured to receive a voltage approximately equal to the voltage of the array, the comparator including a first voltage source, a first transistor, a second transistor, a third transistor, and a fourth transistor, a base of the third transistor being coupled to a base of the fourth transistor.
5 more elements
Dependencies are inferred from the claim text.