11. An operational amplifier can, if necessary, be forced to act as a comparator. 12. A fully differential amplifier is similar to the operational amplifier , but also has differential outputs. 13. For very high-frequency circuits, a current-feedback operational amplifier is often used. 14. A basic inverting transresistance amplifier can be built from an operational amplifier and a single resistor. 15. It was pioneer in the fields of digital-to-analog converters and operational amplifiers . 16. An industry milestone was the OP07 which was the first internally compensated three stage operational amplifier . 17. In this application, the sum and difference of two input voltages are formed using operational amplifiers . 18. In 1963, Fairchild hired Robert Widlar to design analog operational amplifiers using Fairchild's process. 19. When using active components, such as operational amplifiers , the differentiation index can be arbitrarily high. 20. The magnitude of the output voltage is a property of the operational amplifier and its power supply.
