Patent ID: 11961542
Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A data storage device comprising:
a slider with a resistive temperature detector (RTD) with a first resistance;
a resistance detection circuit electrically coupled to the first resistance, the resistance detection circuit comprising a low frequency (LF) path and a high frequency (HF) path, wherein the resistance detection circuit is configured to concurrently operate in an alternating current (AC) mode and a direct current (DC) mode, the AC mode corresponding to the HF path and the DC mode corresponding to the LF path; and
one or more processing devices, configured to:
bias the first resistance with a voltage bias, wherein the first resistance is electrically coupled to a first amplifier circuit on the LF path and a second amplifier circuit on the HF path;
add a bias pulse on the HF path to generate a HF resistance detection signal, wherein the second amplifier circuit is biased using the voltage bias and the bias pulse;
chop, on the LF path, a LF signal at the first amplifier circuit at a first clock frequency; and
demodulate the chopped LF signal on the LF path using the first clock frequency to generate a LF resistance detection signal.