Design Goals
Input | Output | BW | Supply | |||
---|---|---|---|---|---|---|
ViMin | ViMax | VoMin | VoMax | fc | Vcc | Vee |
–0.1V | 0.1V | –2V | 2V | 10kHz | 2.5V | –2.5V |
Design Description
This low-pass non-inverting circuit amplifies the signal level by 20V/V (26dB) and filters the signal by setting the pole at 10kHz. Components R1 and C1 create a low-pass filter on the non-inverting pin. 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. Components C2 and R3 are used to set the cutoff frequency, fc, of the non-inverting amplifier.
Design Notes
Design Steps
The DC transfer function of this circuit follows:
Choose R2 = 1kΩ:
Choose R1 = 1kΩ:
Design Simulations
AC Simulation Results
Transient Simulation Results
A 1-kHz, 0.2-VPP sine wave yields a 4-VPP output sine wave.
A 100-kHz, 0.2-VPP sine wave yields a 0.071-VPP output sine wave.
Design References
Design Featured Op Amp
TLV9001 | |
---|---|
Vss | 1.8V to 5.5V |
VinCM | Rail-to-rail |
Vout | Rail-to-rail |
Vos | 0.4mV |
Iq | 60µA |
Ib | 5pA |
UGBW | 1MHz |
SR | 2V/µs |
#Channels | 1,2,4 |
www.ti.com/product/TLV9001 |
Design Alternate Op Amp
OPA375 | |
---|---|
Vss | 2.25V to 5.5V |
VinCM | Vee to Vcc – 1.2V |
Vout | Rail-to-rail |
Vos | 0.15mV |
Iq | 890µA |
Ib | 10pA |
UGBW | 10MHz |
SR | 4.75V/µs |
#Channels | 1,2,4 |
www.ti.com/product/OPA375 |
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