10

100

1k

10k

FREQUENCY (Hz)

1

10

100

GAIN = 1000

GAIN = 500

GAIN = 250

GAIN = 100

GAIN = 51

GAIN = 10

1

10

100

1000

CLOSED LOOP GAIN (V/V)

0

4

8

12

16

20

24

f = 100 Hz

LMP2021, LMP2022

SNOSAY9D – SEPTEMBER 2008 – REVISED JULY 2009

www.ti.com

Figure 39. Input Voltage Noise Density decreases with Gain

Figure 40 shows the input voltage noise density does not have the 1/f component.

Figure 40. Input Voltage Noise Density with no 1/f

With smaller and smaller input signals and high precision applications with lower error budget, the reduced input

voltage noise and no 1/f noise allow more flexibility in circuit design.

ACHIEVING LOWER NOISE WITH FILTERING

The low input voltage noise of the LMP2021/LMP2022, and no 1/f noise make these suitable for many

applications with noise sensitive designs. Simple filtering can be done on the LMP2021/LMP2022 to remove high

frequency noise. Figure 41 shows a simple circuit that achieves this.

14

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