A low-power switched-capacitor third-order sigma- delta (ΣΔ) modulator suitable for portable sensor systems is described. The architecture uses only one operational amplifier working in a ...

A dual-operational amplifier that will settle to 0.01% in 400 ns with a 10-V output step is discussed. Quiescent operating current is 3 mA per amplifier. A low-cost, 40-V, bipolar process with ...

Circuit and working. Fig. 2 shows the circuit diagram of the automatic evening light. It is built around the dual op-amp IC LM358. The first op-amp, built around IC1A, is used as a comparator. The ...