INVERTING AMPLIFIER SCHEMATIC PCB CALCULATION USING TLV170
This design inverts the input signal, Vi, and applies a signal gain of –2V/V. The input signal typically comes from a low-impedance source because the input impedance of this circuit is determined by the input resistor, R3. The common-mode voltage of an inverting amplifier is equal to the voltage connected to the non-inverting node, which is ground in this design. D1 indicates the power, all connection can be done using CN1 header connector, Capacitors, Resistors, LEDs are SMD components size 0805. Op-Amp TLV170 from Texas Instruments.
D1=Power LED, CN1= 6 Pin male header connector
ViMIN=-7V, ViNMAX=7V, VoMIN=–14V, VoMAX=14V, F=3KHZ, V+=15V, V-=-15V
- Use the op amp in a linear operating region. Linear output swing is usually specified under the AOL test conditions. The common-mode voltage in this circuit does not vary with input voltage.
- The input impedance is determined by the input resistor. Make sure this value is large when compared to the source’s output impedance.
- Using high value resistors can degrade the phase margin of the circuit and introduce additional noise in the circuit.
- Avoid placing capacitive loads directly on the output of the amplifier to minimize stability issues.
- Small-signal bandwidth is determined by the noise gain (or non-inverting gain) and op amp gainbandwidth product (GBP). Additional filtering can be accomplished by adding a capacitor in parallel to R1. Adding a capacitor in parallel with R1 will also improve stability of the circuit if high value resistors are used.
- Large signal performance may be limited by slew rate. Therefore, check the maximum output swing versus frequency plot in the data sheet to minimize slew-induced distortion.
- For more information on op amp linear operating region, stability, slew-induced distortion, capacitive load drive, driving ADCs, and bandwidth please see the Design References section.
Application Courtesy of Texas Instruments