# Op-Amp Gain

#### cps13

Feb 25, 2013
54
I have a question in which I have to compare the specs of two op-amps in a table to text descriptions and match them together.

My question is, one of the descriptions states that the gain is 112dB. I believe this to be Op Amp A, as the description also states the PSRR is 120dB. How do I calculate the gain from the values in the table?

I thought the gain would be:

20log(160000/1). But that yields 104dB.

Thanks.

The table is:

Op Amp A

Voltage Gain
Open loop @ f=100Hz is 160000 V/V

Supply Current
Vcc = 15V 10mA

Input Resistance
200k

Input offset voltage
When Rs = 10k is 2.7mV

input bias current
0.5uA

input offset current
0.2uA

output resistance
Open loop = 150ohm

output current (source)
8mA

output current (sink)
2mA

output swing voltage
PtoP, Vcc +/-15V is -13 to +13 V

unity gain BW
15MHz

PSRR
@ 1kHz 120dB

Total equivalent input noise
1.6 nV/sqrt Hz

slew rate
Vcc = +/- 15V slew rate is 5 V/us

Last edited:

#### crutschow

May 7, 2021
763
I don't see which spec is for op amp A and which is for op amp B.

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