SBOA293A December 2018 – January 2021 TLV9002
This tunable low–pass inverting amplifier circuit amplifies the signal level by 26dB or 20V/V. R2 and C1 set the cutoff frequency for this circuit. The frequency response of this circuit is the same as that of a passive RC filter, except that the output is amplified by the pass–band gain of the amplifier. Low–pass filters are often used in audio signal chains and are sometimes called bass–boost filters.
The DC transfer function of this circuit is given below.
AC Simulation Results
Transient Simulation Results
A 100 Hz, 0.2 Vpp sine wave yields a 4 Vpp output sine wave.
A 100 kHz, 0.2 Vpp sine wave yields a 0.1 Vpp output sine wave.
Design Featured Op Amp
|Vss||1.8V to 5.5V|
Design Alternate Op Amp
|Vss||2.25V to 5.5V|
|VinCM||Vee to Vcc –1.2V|
|A||January 2021||Updated result in Design Step 4 from 0.25 to 0.025|