SBOS058 Data sheet

SBOS058B December 1997 – November 2024 OPA134 , OPA2134 , OPA4134

PRODUCTION DATA

7.2.2 Detailed Design Procedure

The infinite-gain multiple-feedback circuit for a low-pass network function is shown in Figure 7-1. The voltage transfer function is:

Equation 2.

\frac{O u t p u t}{I n p u t} (s) = \frac{\frac{- 1}{R_{1} R_{3} C_{2} C_{5}}}{s^{2} + s (\frac{1}{C_{2}}) (\frac{1}{R_{1}} + \frac{1}{R_{3}} + \frac{1}{R_{4}}) + (\frac{1}{R_{3} R_{4} C_{2} C_{5}})}

This circuit produces a signal inversion. For this circuit, the gain at DC and the low-pass cutoff frequency are calculated using Equation 3 and Equation 4.

Equation 3.

G a i n = \frac{R_{4}}{R_{1}}

Equation 4.

f_{C} = \frac{1}{2 π} \sqrt{\frac{1}{R_{3} R_{4} C_{2} C_{5}}}

WEBENCH® Circuit Designer creates customized power supply and active filter circuits based on your system requirements. The environment gives you end-to-end selection, design, and simulation capabilities that save you time during all phases of the analog design process.

Use our tools to help with your designs: