Single supply AC amplifier
Single supply AC amplifier with circuit equations and operating-limit checks.
Development preview. Check the assumptions below before relying on a result. Calculations run in your browser.
How it calculates
Midrail bias: Vbias = Vs Rbottom/(Rtop+Rbottom)
AC signal: H(s) = [s Rin Cin/(1+s Rin Cin)] [1+s(Rg+Rf)Cg]/[1+s Rg Cg]
Assumptions
- AC input drives the non-inverting input through Cin; Rin returns that input to a bypassed midrail. Rg and Cg are in series to ground, so the feedback stage has DC noise gain one. Bias source is assumed stiff over the signal band; startup estimate only covers its RC divider.
Worked example
These are the calculator's default inputs. Change any input above to recalculate.
Inputs
- Supply voltage
- 5 V
- Bias top resistor
- 100000 Ω
- Bias bottom resistor
- 100000 Ω
- Bias bypass capacitor
- 0.00001 F
- AC input bias resistance
- 100000 Ω
- Input coupling capacitor
- 0.000001 F
- Feedback resistor
- 90000 Ω
- Gain ground resistor
- 10000 Ω
- Ground-leg capacitor
- 0.00001 F
Results
- High-frequency gain
- 10
- DC output bias
- 2.5 V
- Input high-pass corner
- 1.59155 Hz
- Gain transition corner
- 1.59155 Hz
- Bias 1% settling
- 2.30259 s