Calculadora de Ganancia del Op-Amp
Configuraciones inversora, no inversora y diferencial
Required Parameters
Waiting for input data...
Quick Answer
Non-inverting gain: G = 1 + Rf/Rg. Inverting gain: G = -Rf/Rin. Differential gain: G = Rf/R1 (when matched).
Design Notes
Op-amp gain is set by external resistors, not the op-amp itself. The Gain-Bandwidth Product (GBW) limits useful gain at high frequencies: at 10× gain with a 10 MHz GBW op-amp, bandwidth drops to 1 MHz. Use 1% or better resistors for precision gain stages. For gains >100, consider two cascaded stages to avoid bandwidth and stability issues.
Common Mistakes
- 1
Forgetting the sign inversion in inverting configurations — the output is 180° out of phase with the input.
- 2
Exceeding the GBW product — requesting too much gain at too high a frequency causes signal attenuation.
- 3
Not providing a DC bias path for the non-inverting input in AC-coupled designs.
Knowledge Base
¿Cuál es la ganancia no inversora?
G = 1 + Rf/Rg. Mínima ganancia = 1 (buffer seguidor de voltaje). Con Rf=100kΩ, Rg=10kΩ: G = 11 (20.8 dB). Impedancia de entrada muy alta.
¿Cuál es la ganancia inversora?
G = -Rf/Rin. El signo negativo indica inversión de 180°. Impedancia de entrada = Rin. Puede ser menor que 1 (atenuador).
¿Qué es el producto ganancia-ancho de banda?
GBW = Ganancia × Ancho de banda, constante para cada op-amp. Con GBW = 10 MHz a ganancia 10, el ancho de banda baja a 1 MHz. A ganancia 100: solo 100 kHz.
¿Qué op-amp elegir?
General: LM358. Precisión: OPA2277. Alta velocidad: AD8065. Bajo ruido: OPA1612 (audio). Bajo consumo: MCP6001 (100µA). Siempre verificar: rango de alimentación, GBW y slew rate.
Related Engineering Tools
Attenuator Calculator
Tee, Pi, bridged-T, and reflection pads
dBm to Watts Conversion
RF power conversion both ways
Frequency to Wavelength Conversion
Convert frequency and wavelength with velocity factor
RMS Voltage Calculator
Convert RMS, peak, and peak-to-peak for sine waves