TS616 datasheet(25/37 Pages) STMICROELECTRONICS

部件名	TS616

功能描述	Dual wide band operational amplifier with high output current

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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TS616

Noise measurements

25/37

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:

●

R1=100

Ω, R2=910 Ω, R3=0, gain= 10.1

●

Equivalent input noise: 3.40 nV/

√Hz

●

Negative input current noise: iNn =21 pA/

√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.

●

R1=100

Ω, R2=910 Ω, R3=100 Ω, Gain=10.1

●

Equivalent input noise: 3.93 nV/

√Hz

●

Positive input current noise: iNp=15 pA/

√Hz

●

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

●

Instrumentation: HP3585A Spectrum Analyzer (the input noise of the HP3585A is

8nV/

√Hz)

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