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Show the circuit of a non-inverting amplifier for an op amp with a gain of 20dB
sgfrol

sgfrol

@copilot Show the circuit of a non-inverting amplifier for an op amp with a gain of 20dB
2y

copilot

To create a non-inverting amplifier circuit with an Operational Amplifier (op-amp) that provides a gain of 20 dB, let's start with the basic formula for gain in dB and the formula for the gain of a non-inverting amplifier.
The gain in dB is given by:
GaindB=20log⁡10(Vout/Vin)Gain_{\text{dB}} = 20 \log_{10}(V_{\text{out}} / V_{\text{in}})
To convert a gain of 20 dB into a voltage gain ($V_{\text{out}} / V_{\text{in}}$), we rearrange the formula:
Vout/Vin=10GaindB/20=1020/20=10V_{\text{out}} / V_{\text{in}} = 10^{Gain_{\text{dB}} / 20} = 10^{20 / 20} = 10
The voltage gain ($A_V$) for a non-inverting amplifier is also given by:
AV=1+RfRinA_V = 1 + \frac{R_f}{R_{in}}
Where:
  • $A_V$ is the voltage gain,
  • $R_f$ is the feedback resistor, and
  • $R_{in}$ is the resistor connected to ground.
Given that $A_V = 10$, we can choose values for $R_f$ and $R_{in}$ that satisfy the equation. A common practice is to choose standard resistor values.
Let's assume $R_{in} = 1k\Omega$ for ease of calculation. To achieve a gain of 10, the formula rearranges to:
Rf=(AV−1)⋅Rin=(10−1)⋅1kΩ=9kΩR_f = (A_V - 1) \cdot R_{in} = (10 - 1) \cdot 1k\Omega = 9k\Omega
Circuit Connection:
  1. Connect your op-amp's positive (non-inverting) input $V^+$ to $R_{in}$: Connect OPAMP:V+ to R_in:1.
  2. Connect $R_{in}$:2 to GND.
  3. Connect $R_{in}$:1 (also connected to OPAMP:V+) to $R_f$:1.
  4. Connect $R_f$:2 to OPAMP:Vout.
  5. Connect the op-amp's negative (inverting) input $V^-$ to $R_f$:2 (where it meets OPAMP:Vout), creating a feedback loop.
  6. Connect the op-amp's power supply pins $V_{cc}$ and $V_{ee}$ to your circuit's power supply and ground respectively (not specified here, but this is a critical step).
Component List:
  • Op-Amp: 1x, any general purpose op-amp would fit, for example, LM358 or TL081, depending on your power supply and bandwidth requirements.
  • $R_{in}$: 1k\Omega, 1x
  • $R_f$: 9k\Omega, 1x
Remember to adjust the power supply voltage of the op-amp based on its specifications and your application needs.
2y
sgfrol

sgfrol

create this
2y

copilot

To design this non-inverting amplifier circuit in Flux, follow these steps. This guide assumes you are familiar with the basic operations within the Flux interface.
Step 1: Start a New Project
  • Launch Flux and create a new project.
  • Name your project appropriately, for instance, "20dB Non-Inverting Amplifier."
Step 2: Add Components
You will need to add the following components to your project:
  1. Operational Amplifier (Op-Amp): Search for a general-purpose op-amp like the LM358 or TL081 in the components library and place it in your schematic.
  2. Resistors: You will need two resistors. One with a value of $1k\Omega$ (R_in) and another with $9k\Omega$ (R_f). Place two resistors in your schematic.
Step 3: Wiring the Circuit
  1. Non-Inverting Input (V+):
    • Connect the non-inverting input of the op-amp to one end of the $1k\Omega$ resistor (Let's refer to this resistor as R1 for simplicity).
    • The other end of R1 should be connected to the ground (GND).
  2. Feedback Resistor (Rf):
    • Connect one end of the $9k\Omega$ resistor (R2) between the output and the inverting input of the op-amp to form a feedback loop.
  3. Inverting Input (V-):
    • Directly connect the inverting input of the op-amp to the junction between R2 and the op-amp's output.
  4. Power Supply:
    • Don’t forget to connect the power supply pins of the op-amp ($V_{cc}$ and $V_{ee}$) to your circuit’s positive voltage and ground, respectively.
Step 4: Connect Input and Output
  • Input Signal: Connect your input signal to the junction between the non-inverting input of the op-amp and R1.
  • Output Signal: Connect your output from the op-amp's output pin.
Step 5: Verify and Save
  • Double-check all your connections.
  • Save your schematic.
Connection Summary:
  • Connect OPAMP:V+ to R1:1.
  • Connect R1:2 to GND.
  • Connect R2:1 to OPAMP:Vout and OPAMP:V-.
  • Connect OPAMP:Vcc to your positive power supply and OPAMP:Vee to GND.
Step 6: Simulation and PCB Layout
  • If Flux supports simulation, you may simulate your circuit to verify its operation.
  • Proceed to design the PCB layout after confirming the circuit works as expected in the schematic.
This guide provides a textual description of setting up a 20dB non-inverting amplifier in Flux. Adjust component values and the op-amp model based on your specific requirements and availability.
2y
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