Patent ID: 11874182
Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 20:
21. Control circuitry comprising:
a first amplifier circuit;
a second amplifier circuit;
a source for generating an alternating bias signal for biasing a first resistance of a resistive temperature detector (RTD), wherein the alternating-bias signal generates a voltage bias across the first resistance, and wherein the alternating bias signal has a first clock frequency;
a modulator for modulating, using the first clock frequency, an input signal of the first amplifier circuit to generate a modulated signal, wherein the input signal corresponds to the voltage bias;
a demodulator demodulating, at an output of the second amplifier circuit, an amplified modulated signal using the first clock frequency to generate a resistance detection signal, wherein the second amplifier is electrically coupled to the first amplifier circuit and configured to amplify the modulated signal; and
a low-pass filter coupled at an output of the second amplifier circuit, wherein the low-pass filter filters the demodulated signal to generate the resistance detection signal.