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–48V Low Side Precision Current Sense “Classic” High-Precision Low Side Current Sense 1Hz to 100MHz Voltage to Frequency Converter Has 160dB Dynamic Range, Runs From 5V Supply 40nVpp Noise, 0.05uV/C Drift, Chopped FET Amplifier APD DC Coupled Current Monitor from 20V to 90V APD Bias Differential Bridge Amplifier Differential Bridge Amplifier with Gain Programmed through the Serial Interface and Analog to Digital Conversion (Standby Current Less than 100μA) Ground Referred Precision Current Sources High Resolution Battery-Powered Robust Type K Thermocouple Signal Conditioning Amplifier with Cold Junction Compensation 湿度センサからデータ収集システムへのインタフェース Low Noise, Low Power Photodiode Amplifier With DC Precision Low Power, Bidirectional 60V Precision Hi Side Current Sense Precision Voltage Controlled Current Source Single Supply Type K Thermocouple Signal Conditioning Amplifier with Cold Junction Compensation Ultra-Precision, Wide Dynamic Range 10Hz Bandwidth Photodiode Amplifier
–48V Low Side Precision Current Sense
This amplifier configuration is essentially the complementary implementation to the classic high-side configuration. The op amp used must support common-mode operation at its lower rail. A “floating” shunt-regulated local supply is provided by the Zener diode, and the transistor provides metered current to an output load resistance (1kΩ in this circuit). In this circuit, the output volt-age is referenced to a positive potential and moves downward when representing increasing –48V loading. Scaling accuracy is set by the quality of resistors used and the performance of the NPN transistor.
