LT1007, LT1007A, LT1037, LT1037A

LOW-NOISE, HIGH-SPEED, PRECISION OPERATIONAL AMPLIFIERS

SLOS017C – D3195, FEBRUARY 1989 – REVISED JANUARY 1993

POST OFFICE BOX 655303

18

APPLICATION INFORMATION

noise testing

Figure 39 shows a test circuit for 0.1-Hz to 10-Hz peak-to-peak noise measurement of the LT1007 and LT1037.

The frequency response of this noise tester indicates that eeethe 0.1 Hz corner is defined by only one zero.

Because the time limit acts as an additional zero to eliminate noise contributions from the frequency band below

0.1 Hz, the test time to measure 0.1-Hz to 10-Hz noise should not exceed 10 seconds.

100

90

80

70

60

50

40

30

Frequency – Hz

100

10

1

0.1

0.01

0.1 Hz to 10 Hz p-p NOISE TESTER

FREQUENCY RESPONSE

RIN = 1 MΩ

x 1

Scope

22

µF

110 k

Ω

2.2

µF

4.3 k

Ω

24.3 k

Ω

0.1

µF

100 k

Ω

LT1001

4.7

µF

2 k

Ω

= 50,000

Voltage Gain

10

Ω

100 k

Ω

0.1

µF

+

–

†

† Device under test

NOTE: All capacitor values are for non-polarized capacitors only.

Figure 39. 0.1-Hz To 10-Hz Noise Test Circuit