Design Goals
Input | Output | Freq. | Supply | |||
---|---|---|---|---|---|---|
ViMin | ViMax | VoMin | VoMax | f | Vcc | Vee |
–7V | 7V | –14V | 14V | 3kHz | 15V | –15V |
Design Description
This design inverts the input signal, Vi, and applies a signal gain of –2V/V. The input signal typically comes from a low-impedance source because the input impedance of this circuit is determined by the input resistor, R1. The common-mode voltage of an inverting amplifier is equal to the voltage connected to the non-inverting node, which is ground in this design.
Design Notes
Design Steps
The transfer function of this circuit follows:
Design Simulations
DC Simulation Results
AC Simulation Results
The bandwidth of the circuit depends on the noise gain, which is 3V/V. The bandwidth is determined by looking at the –3-dB point, which is located at 3dB given a signal gain of 6dB. The simulation sufficiently correlates with the calculated value of 400kHz.
Transient Simulation Results
The output is double the magnitude of the input and inverted.
References:
Design Featured Op Amp
TLV170 | |
---|---|
Vss | ±18 V (36 V) |
VinCM | (Vee-0.1 V) to (Vcc-2 V) |
Vout | Rail-to-rail |
Vos | 0.5 mV |
Iq | 125 µA |
Ib | 10 pA |
UGBW | 1.2 MHz |
SR | 0.4 V/µs |
#Channels | 1, 2, 4 |
www.ti.com/product/tlv170 |
Design Alternate Op Amp
LMV358A | |
---|---|
Vss | 2.5 V to 5.5 V |
VinCM | (Vee–0.1 V) to (Vcc–1 V) |
Vout | Rail-to-rail |
Vos | 1 mV |
Iq | 70 µA |
Ib | 10 pA |
UGBW | 1 MHz |
SR | 1.7 V/µs |
#Channels | 1 (LMV321A), 2 (LMV358A), 4 (LMV324A) |
www.ti.com/product/lmv358A |
Revision | Date | Change |
---|---|---|
C | December 2020 | Updated result for Design Step 6. |
B | March 2019 | Changed LMV358 to LMV358A in the Design Alternate Op Amp section. |
A | January 2019 | Downstyle title. Added link to circuit cookbook landing page. |
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