ELECTRONIC CIRCUITRY FOR HIGH-TEMPERATURE ENVIRONMENTS
First Claim
1. A circuitry adapted to operate in a high-temperature environment of a turbine engine, the circuitry comprising:
- a sensing element disposed on a component of the turbine engine to sense a parameter of the component and provide a voltage indicative of the sensed parameter;
a differential amplifier having an input terminal coupled to the sensing element to receive the voltage indicative of the sensed parameter;
wherein said differential amplifier comprises a first pair of semiconductor switches each having a respective gate bias network comprising a first resistive element having a positive temperature coefficient of resistance coupled between a voltage source and a respective gate terminal of a respective one of the semiconductor switches and a second resistive element having a zero temperature coefficient of resistance coupled between the respective gate terminal and electrical ground, wherein each respective gate bias network is arranged so that when temperature increases, a respective bias voltage at the respective gate terminals of the semiconductor switches decreases; and
a hybrid load circuitry AC-coupled to the differential amplifier, wherein the differential amplifier and the hybrid load circuitry are disposed in the high-temperature environment of the turbine engine.
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Accused Products
Abstract
A circuitry adapted to operate in a high-temperature environment of a turbine engine is provided. A relatively high-gain differential amplifier (102) may have an input terminal coupled to receive a voltage indicative of a sensed parameter of a component (20) of the turbine engine. A hybrid load circuitry may be coupled to the differential amplifier. A voltage regulator circuitry (244) may be coupled to power the differential amplifier. The differential amplifier, the hybrid load circuitry and the voltage regulator circuitry may each be disposed in the high-temperature environment of the turbine engine.
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Citations
27 Claims
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1. A circuitry adapted to operate in a high-temperature environment of a turbine engine, the circuitry comprising:
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a sensing element disposed on a component of the turbine engine to sense a parameter of the component and provide a voltage indicative of the sensed parameter; a differential amplifier having an input terminal coupled to the sensing element to receive the voltage indicative of the sensed parameter; wherein said differential amplifier comprises a first pair of semiconductor switches each having a respective gate bias network comprising a first resistive element having a positive temperature coefficient of resistance coupled between a voltage source and a respective gate terminal of a respective one of the semiconductor switches and a second resistive element having a zero temperature coefficient of resistance coupled between the respective gate terminal and electrical ground, wherein each respective gate bias network is arranged so that when temperature increases, a respective bias voltage at the respective gate terminals of the semiconductor switches decreases; and a hybrid load circuitry AC-coupled to the differential amplifier, wherein the differential amplifier and the hybrid load circuitry are disposed in the high-temperature environment of the turbine engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A circuitry adapted to operate in a high-temperature environment, the circuitry comprising:
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a differential amplifier having an input terminal coupled to receive a voltage indicative of a sensed parameter of a component in the high-temperature environment; a hybrid load circuitry AC-coupled to the differential amplifier; a voltage regulator circuitry coupled to power the differential amplifier, wherein the differential amplifier, the hybrid load circuitry and the voltage regulator circuitry are disposed in the high-temperature environment. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A circuitry adapted to operate in a high-temperature environment of a turbine engine, the circuitry comprising:
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a differential amplifier having an input terminal coupled to receive a voltage indicative of a sensed parameter regarding a component of the turbine engine; a hybrid load circuitry AC-coupled to the differential amplifier; wherein said differential amplifier comprises a first pair of semiconductor switches each having a respective gate bias network comprising a first resistive element having a positive temperature coefficient of resistance coupled between a voltage source and a respective gate terminal of a respective one of the semiconductor switches and a second resistive element having a zero temperature coefficient of resistance coupled between the respective gate terminal and electrical ground, wherein each respective gate bias network is arranged so that when temperature increases, a respective bias voltage at the respective gate terminals of the semiconductor switches decreases; and a voltage regulator circuitry coupled to power the differential amplifier, wherein the differential amplifier, the hybrid load circuitry and the voltage regulator circuitry are disposed in the high-temperature environment of the turbine engine; wherein the voltage regulator circuitry comprises; a constant current source comprising at least a first semiconductor switch and a first resistor connected between a gate terminal and a source terminal of the first semiconductor switch, the constant current source further comprising a cascaded input stage connected to receive an input voltage to be regulated by the voltage regulator; a second resistor having a first lead connected to the gate terminal of the first semiconductor switch and a second lead connected to an output node of the regulator, wherein the constant current source is coupled to provide a voltage reference across the second resistor; and a source follower output stage comprising a second semiconductor switch and a third resistor connected between the output node and a source terminal of the second semiconductor switch, wherein the first lead of the second resistor is connected to apply the generated voltage reference to a gating terminal of the second semiconductor switch, wherein the source terminal of the second semiconductor switch supplies a first regulated output voltage of the voltage regulator, and wherein the output node supplies a second regulated output voltage of the voltage regulator, wherein the second regulated output voltage comprises a different polarity relative to a polarity of the first regulated output voltage.
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Specification