Electronic circuitry for high-temperature environments

A circuitry adapted to operate in a high-temperature environment of a turbine engine, the circuitry comprising:

• 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.