SBOU192 July   2017

 

  1.   DIYAMP-SC70-EVM
    1.     Trademarks
    2. 1 Introduction
      1. 1.1 DIYAMP-SC70-EVM Kit Contents
      2. 1.2 EVM Features
      3. 1.3 List of Circuits on the EVM
    3. 2 Hardware Setup
      1. 2.1 EVM Circuit Locations
      2. 2.2 EVM Assembly Instructions
    4. 3 Schematic and PCB Layout
      1. 3.1  Schematic PCB Drawing
      2. 3.2  Single-Supply, Multiple Feedback Filter
      3. 3.3  Single-Supply, Sallen-Key Filter
      4. 3.4  Single-Supply, Non-Inverting Amplifier
      5. 3.5  Single-Supply, Inverting Amplifier
      6. 3.6  Difference Amplifier
      7. 3.7  Dual-Supply, Multiple Feedback Filter
      8. 3.8  Dual-Supply, Sallen-Key Filter
      9. 3.9  Inverting Comparator
      10. 3.10 Non-Inverting Comparator
      11. 3.11 Riso With Dual Feedback
      12. 3.12 Dual-Supply, Non-Inverting Amplifier
      13. 3.13 Dual-Supply, Inverting Amplifier
    5. 4 Connections
      1. 4.1 Inputs and Outputs
      2. 4.2 Power
      3. 4.3 Enable and Disable Feature
    6. 5 Bill of Materials and Reference
      1. 5.1 Bill of Materials
      2. 5.2 Reference

3.13 Dual-Supply, Inverting Amplifier

Figure 43 shows the schematic for the dual-supply, inverting amplifier circuit configuration.

diyamp_nfig43_DS_invert_amp_sch.pngFigure 43. Dual-Supply, Inverting Amplifier Schematic

The inverting op-amp configuration takes an input signal that is applied directly to the inverting input terminal and outputs a signal that is the opposite polarity as the input signal. The benefit of this topology is that it avoids common mode limitations. The load resistance for this topology is equal to R2. The values of the resistors in the feedback network will determine the amount of gain to amplify the input signal.

Equation 28 displays the transfer function for the dual-supply, inverting amplifier circuit configuration shown in Figure 43.

Equation 28. nneq28a_sbou162.gif

Capacitor C3 provides the option to filter the output. The cutoff frequency of the filter can be calculated using Equation 29.

Equation 29. nneq28_sbou162.gif

The PCB layout of the top layer of the dual-supply, inverting amplifier circuit configuration is displayed in Figure 44.

diyamp_nfig44_ds_inv_top.pngFigure 44. Dual-Supply, Inverting Amplifier Top Layer

The PCB layout of the bottom layer of the dual-supply, inverting amplifier circuit configuration is displayed in Figure 45.

diyamp_nfig45_ds_inv_bottom.pngFigure 45. Dual-Supply, Inverting Amplifier Bottom Layer