加法器放大器计算器 — 公式

Non-Inverting Op-Amp Configuration

Formula

Gain = 1 + Rf / R1

V_out = (1 + Rf / R1) x V_in

Output is in phase with input. Minimum gain is 1. Input impedance is very high, set by the op-amp input stage.

计算示例

R1 = 10k, Rf = 90k, input signal is 1 V.

  1. Gain = 1 + 90 / 10 = 10 V/V
  2. Gain in dB = 20 x log10(10) = 20 dB
  3. V_out = 10 x 1 = 10 V