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.
Isolated Amplifier
Signal Conditioning
Galvanic signal decoupling components pass analog voltage signals across high-voltage insulation barriers without direct electrical contact. Incorporating an isolated amplifier protects sensitive analog-to-digital converters from high common-mode voltages present on shunt resistor sense nodes. Internal coupling technologies utilize capacitive, optical, or magnetic transformers.
Barrier Topology
Differential input structures allow small voltage drops across low-side or high-side sense resistors to be measured accurately in motor drives. Operational features of an isolated amplifier convert low-amplitude differential voltages into robust isolated outputs suitable for system controllers. High isolation ratings prevent ground loops and shield digital logic from power stage noise.
Rejection Performance
Industrial power systems demand extreme transient immunity to prevent signal corruption during rapid voltage transitions. Evaluating an isolated amplifier requires measuring common-mode transient immunity in kilovolts per microsecond alongside standard gain accuracy and linearity parameters. High transient rates induce parasitic currents across isolation barriers that can disrupt internal modulator operation.
Calibration routines trim input offset voltage and gain temperature coefficients prior to shipment.
Dynamic Range
Input bias currents and differential input impedance set baseline loading conditions on external sense networks. Selecting an isolated amplifier with high input impedance minimizes measurement loading errors in precision current monitoring loops.