Select Biasing Method:

dc coupled non-inverting op-amp biased with split resistor biasing method

dc coupled non-inverting op-amp split resistor biasing

dc coupled non-inverting Op-Amp biased with VDB

This calculators helps you to bias an dc coupled inverting op-amp using single supply voltage.

Equations Used:

\(A_v=-\frac{R_2}{R_1}\)
\(V_b = \frac{R_3}{R_3+R_4} V_s\)

ac coupled non-inverting Op-Amp biased with split resistor

Inputs:
V_s: V
V_b: V
f_c:
R₄:
A_v:
R₂:

Results:
R₃:
C₁=R₅:
C₂:

ac coupled non-inverting op-amp split resistor biasing circuit diagram

ac coupled non-inverting Op-Amp biased with split resistor

This calculator can be used to bias ac coupled inverting op-amp using the split resistor biasing methods.

Equations Used:

\(C=\frac{F_{osc}}{2 N F_{w}}-1\)
where, F_osc is the frequency of the CPU, F_w is the output square wave frequency and N is the pre-scalar value.

ac coupled non-inverting Op-Amp biased with VDB

Inputs:
V_s: V
A_v:
f_c:
C₁=C₄:
V_b: V
R₄:

Results:
R₁=R₅:
R₂:
R₃:

ac coupled Non-Inverting Op-Amp biased with voltage follower biasing circuit diagram

ac coupled non-inverting Op-Amp biased with VDB

The above calculator can be used to bias ac coupled inverting op-amp using voltage divider biasing method.

Design Example:

The following shows op-amp biased at 2.5V, cutoff frequency of 1KHz and with gain of 10.

example design vdb non-inverting op-amp

The following shows the input and output signal waveform:

ac coupled non-inverting signal waveform

The following shows the frequency response of the circuit.

ac coupled non-inverting frequency response

Equations Used:

\(A_v=1+\frac{R_2}{R_1}\)
\(V_b = \frac{R_4}{R_3+R_4}V_s\)
\(f_c = \frac{1}{2 \pi R_5 C_1} = \frac{1}{2 \pi R_1 C_4}\)

ac coupled non-inverting Op-Amp biased with voltage follower biasing

Inputs:
V_s: V
A_v:
f_c:
C₁=C₄:
V_b: V
R₄:

Results:
R₁=R₅:
R₂:
R₃:

ac coupled non-inverting Op-Amp biased with voltage follower biasing

This calculator can be used to bias ac coupled inverting op-amp using the voltage follower biasing method. This biasing is same as voltage divider biasing but uses op-amp or transistor to buffer the bias voltage. The disadvatange of this biasing method is that, more circuit component are required. And the advantage is that for dc coupled op-amp amplifier, it reduces the resistor size and therefore less power consumption happens resulting in gain improvement and offset. Also it provides stable bias voltage. It should be used when there is extra op-amp available in the circuit and accurate and stable design are required.

Design example:

Following is circuit design example: