Input | Output | Supply | ||
---|---|---|---|---|
Vi | VoMin | VoMax | Vcc | Vee |
10V | –10V | 10V | 15V | –15V |
This circuit combines an inverting and non-inverting amplifier to make a reference voltage adjustable from the negative of the input voltage up to the input voltage. Gain can be added to increase the maximum negative reference level.
Alpha represents the potentiometer setting relative to ground. This is the fraction of the input voltage that will be applied to the non-inverting terminal of the op amp and amplified by the non-inverting gain.
The transfer function of this circuit follows:
DC Simulation Results
Texas Instruments, SBOMAU2 TINA-TI™ circuit simulation, file download
OPA277 | |
---|---|
Vss | 4V to 36V |
VinCM | Vee+2V to Vcc–2V |
Vout | Vee+0.5V to Vcc–1.2V |
Vos | 10µV |
Iq | 790µA/Ch |
Ib | 500pA |
UGBW | 1MHz |
SR | 0.8V/µs |
#Channels | 1, 2, and 4 |
OPA277 |
OPA172 | |
---|---|
Vss | 4.5V to 36V |
VinCM | Vee–0.1V to Vcc–2V |
Vout | Rail-to-rail |
Vos | 200µV |
Iq | 1.6 mA/Ch |
Ib | 8pA |
UGBW | 10MHz |
SR | 10V/µs |
#Channels | 1, 2, and 4 |
OPA172 |