It has high speed of performance and suitable for low input current applications.ĬA3130A and CA3130 are op amps that combine the advantage of both CMOS and bipolar transistors. The inputs contain MOSFET transistors to provide very high input impedance and very low input current as low as 10pA. IC CA3130 is a 15 MHz BiMOS Operational amplifier with MOSFET inputs and bipolar output. More over the input current requirement is also high in most Op Amps so that these devices cannot be used in circuits based on Photo diodes and Infrared sensors. Some of the general purpose Op Amps will not give a zero output in the off statewhich will affect the working of the remaining circuitry. The most important characteristics of these Op Amps are low input current requirements and the zero output in the off state. This excess voltage can be removed by connecting a diode at the output of IC.ĬA 3130 and CA 3140 are excellent Operational Amplifiers for Signal detection circuits. This may switch on a transistor connected to its output even in the off state of IC. But one important aspect is its output never becomes Zero in the off state in normal function and gives around 0.6 – 1 volt. It has very good stability in closed loop circuits. The high gain and wide range of operating voltages provide superior performance in integrator, summing amplifier and general feedback applications.
It can be used as Summing amplifier, Voltage follower, Integrator, Function generator etc. IC 741 has features like no latch up, high gain, short circuit protection. It is designed for a wide range of analog applications and is featured with wide range of input voltage. It is designed as the Military grade IC to works in harsh environment. IC 741 is the most common Operational Amplifier used in circuits. For this a capacitor (usually 47 pF) is connected between pin 8 and pin1 It is used for Phase compensation and Gain control to optimize frequency response. By adjusting the preset, output can be set at Zero voltage. To keep the output zero, Offset nulling is used by connecting pins 1 and 5 in a preset (usually 10K ) with its wiper to the ground. When the inverting and Non inverting inputs are at same voltage, the output should be Zero. Pins 1 and 5 of OpAmp are called as Offset Null pins. In amplifier design, Schmitt trigger etc, a Feedback resistor will be provided from the output to the input.īesides the commonly used pins, the OpAmp has three more pins. In the reverse situation, the output remains low. In the Comparator mode, the output goes high when the Non inverting input gets a higher voltage than the Inverting input. When the OpAmp is used as a voltage comparator, one input is set at fixed voltage through a potential divider or Zener while the other input gets a variable voltage. The output depends on the voltage difference between these inputs.
The inputs are names as Inverting ( – ve) and Non inverting (+ ve) inputs. Some of the OpAmps like CA3130, CA3140, TL0 71, LM311 etc have excellent performance with very low input current and voltage.Ī typical OpAmp has two inputs and a single output.
In quad OpAmp, four OpAmps are present in the single package. In single OpAmps only one OpAmp is present while in dual type two OpAmps with separate inputs and outputs are present. An OpAmp can deliver an output voltage hundreds or thousand times greater than the voltage difference between its inputs. Operational Amplifier or OpAmp is a DC coupled amplifier with differential inputs and usually with a single output.