Hall Effect against Shunt Sensing on the High Side
High-side shunts deliver superior low-current accuracy under high temperatures, while integrated Hall sensors reduce high-current thermal power loss.
Sinc3 Digital Filter
Filter Architecture
Cascaded integrator-comb digital filtering algorithms process high-frequency bitstreams from delta-sigma modulators into lower-frequency, high-resolution multi-bit pulse code modulation data. Implementing a sinc3 digital filter provides third-order attenuation of quantization noise, balancing signal resolution against group delay in digital measurement systems. Filter notches align with clock frequency multiples.
Frequency Response
Over-sampled bitstreams require decimation to down-sample data to usable system word rates. Transfer characteristics of a sinc3 digital filter yield a attenuation profile proportional to the third power of the sinc function, efficiently suppressing high-frequency quantization noise. Settling time equals exactly three filter clock cycles following a step input change.
Decimation Ratio
Motor control applications demand fast transient response for over-current protection alongside high-resolution steady-state current measurement. Reconfiguring a sinc3 digital filter decimation ratio allows controllers to dynamically trade off effective number of bits against phase latency. Short decimation lengths yield fast fault detection outputs, while longer decimation lengths provide clean signals for accurate field-oriented control loops.
Verification testing confirms notch depth and alias rejection across targeted passbands.
Latency Tradeoff
Linear phase response ensures uniform group delay across all passband frequency components, preventing signal shape distortion. Utilizing a sinc3 digital filter simplifies phase compensation routines in multi-channel telemetry systems.