Transmitter accurately transfers voltage input: 05/15/03  EDN-Design Ideas /  When you connect remote sensors to a central process controller, a simple, robust, and commonly used interface is the 4 to 20-mA loop. The advantages of this current loop include the simplicity of just two twisted wires that share both power and signal, the loop's high noise immunity in harsh environments, and the de facto loop standard within the process-control industry...

Voltage Reference improves JFET: 10/26/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit The common JFET current-source in Figure 1a has average output impedance and depends heavily on the JFET's V P and I DSS variations. These manufacturing variations limit the initial accuracy of the current setpoint that the circuit can obtain with a...