TS615IPWT(2004) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TS615IPWT
(Rev.:2004)

Dual Wide-Band Operational Amplifier with High Output Current

STMicroelectronics 

Noise Measurements

TS615

7.2 Measurement of iNn

To measure the negative input current noise iNn, we set R3=0 and use Equation 5. This time the gain

must be lower in order to decrease the thermal noise contribution:

l R1=100Ω, R2=910Ω, R3=0, gain=10.1

l Equivalent input noise: 3.40nV/√Hz

l Negative input current noise: iNn =21pA/√Hz

7.3 Measurement of iNp

To extract iNp from Equation 3, a resistance R3 is connected to the non-inverting input. The value of R3

must be chosen in order to keep its thermal noise contribution as low as possible against the iNp

contribution.

l R1=100Ω, R2=910Ω, R3=100Ω, Gain=10.1

l Equivalent input noise: 3.93nV/√Hz

l Positive input current noise: iNp=15pA/√Hz

l Conditions: Frequency=100kHz, VCC=±2.5V

l Instrumentation: HP3585A Spectrum Analyzer (the input noise of the HP3585A is 8nV/√Hz)

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