Operational amplifier


Posted on Feb 7, 2014

An operational amplifier, which is often called an op-amp, is a DC - coupled high- gain electronic voltage amplifier with a differential input and, usually, a single-ended output. [1] An op-amp produces an output voltage that is typically millions of times larger than the voltage difference between its input terminals. Typically the op-amp`s very


Operational amplifier
Click here to download the full size of the above Circuit.

large gain is controlled by negative feedback, which largely determines the magnitude of its output ("closed-loop") voltage gain in amplifier applications, or the transfer function required (in analog computers ). Without negative feedback, and perhaps with positive feedback for regeneration, an op-amp essentially acts as a comparator. High input impedance at the input terminals (ideally infinite) and low output impedance at the output terminal(s) (ideally zero) are important typical characteristics. Op-amps are among the most widely used electronic devices today, being used in a vast array of consumer, industrial, and scientific devices. Many standard IC op-amps cost only a few cents in moderate production volume; however some integrated or hybrid operational amplifiers with special performance specifications may cost over $100 US in small quantities. Op-amps sometimes come in the form of macroscopic components, (see photo) or as integrated circuit cells ; patterns that can be reprinted several times on one chip as part of a more complex device. The op-amp is one type of differential amplifier. Other types of differential amplifier include the fully differential amplifier (similar to the op-amp, but with two outputs), the instrumentation amplifier (usually built from three op-amps), the isolation amplifier (similar to the instrumentation amplifier, but which works fine with common-mode voltages that would destroy an...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Analogue / Digital Logger II
    Rf-genie
    IR Widget Consumer infrared remote control capture and visualization
    Low Voltage 2mhz Step-up Dc/dc Converter
    Thermometer circuit schematic using operational amplifiers
    Metal Detector MkII
    A Dozen Small Battery-Powered Alarm Projects
    STK4040x1 made HI-FI amplifier circuit



    Top