TS615IPWT datasheet(25/36 Pages) STMICROELECTRONICS

Il numero della parte	TS615IPWT

Spiegazioni elettronici	DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT

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Noise Measurements

TS615

25/36

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=100

Ω, 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=100

Ω, 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)

TS615IPWT Scheda tecnica(PDF) 25 Page - STMicroelectronics