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A Study on High Precision Op-Amps

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A Study on High Precision Op-Amps

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A Study on High Precision Op-Amps

  1. 1. A Study on High Precision Op-Amps <ul><li>Source: Microchip Technology </li></ul>
  2. 2. Introduction <ul><li>Purpose </li></ul><ul><ul><li>A Study on High Precision Op-Amps </li></ul></ul><ul><li>Outline </li></ul><ul><ul><li>Features and Application </li></ul></ul><ul><ul><li>Op-Amp Basic Block Diagram </li></ul></ul><ul><ul><li>Application Circuit (Gyrator, Instrumentation amplifier, Precision amplifier) </li></ul></ul><ul><li>Content </li></ul><ul><ul><li>11 pages </li></ul></ul>
  3. 3. Features <ul><li>• Low Offset Voltage: ±150 μV (maximum) </li></ul><ul><li>• Low Quiescent Current: 30 μA (typical) </li></ul><ul><li>• Rail-to-Rail Input and Output </li></ul><ul><li>• Wide Supply Voltage Range: 1.8V to 6.0V </li></ul><ul><li>• Gain Bandwidth Product: 385 kHz (typical) </li></ul><ul><li>• Unity Gain Stable </li></ul><ul><li>• Extended Temperature Range: -40°C to +125°C </li></ul><ul><li>• No Phase Reversal </li></ul>
  4. 4. Applications <ul><li>• Automotive </li></ul><ul><li>• Portable Instrumentation </li></ul><ul><li>• Sensor Conditioning </li></ul><ul><li>• Battery Powered Systems </li></ul><ul><li>• Medical Instrumentation </li></ul><ul><li>• Test Equipment </li></ul><ul><li>• Analog Filters </li></ul>
  5. 5. Defining The Op Amp <ul><li>The input stage of the op amp has two terminals, the non-inverting (VIN+) and inverting (VIN-) inputs. </li></ul><ul><li>The speed (SR) at which the output swings from rail to rail is instantaneous and the output impedance (ZOL or ZCL) is zero. </li></ul>
  6. 6. Op-Amp Block Diagram <ul><li>The first stage (of the op amp) is a differential amplifier. </li></ul><ul><li>The second stage is the gain stage </li></ul><ul><li>The third stage is the output stage of the operational amplifier </li></ul>
  7. 7. Inverting/ Non-Inverting Amplifier Inverting Amplifier Non-Inverting Amplifier
  8. 8. Application Circuits: Gyrator GYRATOR <ul><li>A gyrator is a four terminal or a two port device, that is designed to transform a load impedance into an input impedance. </li></ul><ul><li>The gyrator is an electric circuit which can make a capacitive circuit behave inductively. </li></ul><ul><li>The primary application for a gyrator is to reduce the size and cost of a system by removing the need for bulky, heavy and expensive inductors. </li></ul><ul><li>Gyrators will typically have higher accuracy than real inductors, due to the lower cost of precision capacitors than inductors. </li></ul>
  9. 9. Instrumentation Amplifier Two Op Amp Instrumentation Amplifier <ul><li>Instrumentation amplifiers are actually made up of 2 parts: a buffered amplifier and a basic differential amplifier. </li></ul><ul><li>The reference voltage (VREF) is supplied by a low impedance source. VREF is typically VDD/2. </li></ul><ul><li>The ideal common-mode gain of an instrumentation amplifier is zero. </li></ul><ul><li>An instrumentation amp can also be built with 2 op-amps to save on cost and increase CMRR, but the gain must be higher than 2 (+6 dB). </li></ul>
  10. 10. Precision Comparator Precision, Non-inverting Comparator <ul><li>An operational amplifier has a well balanced difference input and a very high gain. </li></ul><ul><li>A standard op-amp operating in open loop configuration (without negative feedback) can be used as a comparator. </li></ul><ul><li>When the non-inverting input (V+) is at a higher voltage than the inverting input (V-), the high gain of the op-amp causes it to output the most positive voltage it can. </li></ul><ul><li>When the non-inverting input (V+) drops below the inverting input (V-), the op-amp outputs the most negative voltage it can </li></ul>
  11. 11. MCP6XXX Amplifier Evaluation Board <ul><li>All amplifier resistors and capacitors are socket. </li></ul><ul><li>All of the component labels on board keep consistent with those on schematic generated in the Mindi™ Amplifier Designer </li></ul><ul><li>Supports all Microchip single op amps: – 8-pin PDIP package – 8-pin SOIC package </li></ul><ul><li>Test points for connecting lab equipment </li></ul><ul><li>Single supply configuration </li></ul>
  12. 12. Additional Resource <ul><li>For ordering MCP605x amplifiers, please click the part list or </li></ul><ul><li>Call our sales hotline </li></ul><ul><li>For more product information go to </li></ul><ul><ul><li>http:// www.microchip.com/wwwproducts/Devices.aspx?dDocName =en541670 </li></ul></ul><ul><li>For additional inquires contact our technical service hotline or even use our “Live Technical Chat” online facility </li></ul>

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