A Fast T&H Overcurrent Detector for a Spinning Hall Current Sensor With Ping-Pong and Chopping Techniques

This paper presents a fast spinning-current Hall sensor with 568 ns overall delay for sub-microsecond overcurrent detection (OCD) in a magnetic current sensor. By combining the continuous-time chopping techniques and discrete-time dynamic offset cancellation techniques, the spinning frequency of 250 kHz does not limit the sensor speed. The proposed track-and-hold (T&H) ping-pong comparators extend the usage of auto-zeroing techniques for sensor interface applications. The design achieves a magnetic residual offset of <inline-formula> <tex-math notation="LaTeX">$85~\mu \text{T}$ </tex-math></inline-formula> (mean) and <inline-formula> <tex-math notation="LaTeX">$79~\mu \text{T}$ </tex-math></inline-formula> (<inline-formula> <tex-math notation="LaTeX">$1\sigma$ </tex-math></inline-formula>), while the offset drifts only <inline-formula> <tex-math notation="LaTeX">$0.68~\mu \text{T}/^{\circ }\text{C}$ </tex-math></inline-formula> (mean) and <inline-formula> <tex-math notation="LaTeX">$0.27~\mu \text{T}/^{\circ }\text{C}$ </tex-math></inline-formula> (<inline-formula> <tex-math notation="LaTeX">$1\sigma$ </tex-math></inline-formula>) from −40 °C to 150 °C. In addition, a background switched-capacitor filter breaks the limitation of high-frequency errors on conventional correlated double sampling techniques. The design thus reduces the input-referred noise to <inline-formula> <tex-math notation="LaTeX">$136~\mu \text{T}_{\mathrm {rms}}$ </tex-math></inline-formula> with a bandwidth of 1.7 MHz, while consuming at least 30% less power than the other state-of-the-art designs. Moreover, the analog stress compensation with temperature coefficient (TC) correction guarantees an overall threshold error within ±4% over package stress and temperature.

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