LMV2011

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SNOSA32C – AUGUST 2003 – REVISED MARCH 2013

Figure 34. Composite Amplifier Configuration

Table 1. Composite Amplifier Measured Performance

AV

R1 (

Ω)

R2 (

Ω)

C2 (pF)

BW (MHz)

SR (V/

μs)

en p-p (mVPP)

50

200

10k

8

3.3

178

37

100

100

10k

10

2.5

174

70

100

1k

100k

0.67

3.1

170

70

500

200

100k

1.75

1.4

96

250

1000

100

100k

2.2

0.98

64

400

In terms of the measured output peak-to-peak noise, the following relationship holds between output noise

voltage, en p-p, for different closed-loop gain, AV, settings, where −3dB Bandwidth is BW:

(1)

Figure 35. Composite Amplifier Configuration

It should be kept in mind that in order to minimize the output noise voltage for a given closed-loop gain setting,

one could minimize the overall bandwidth. As can be seen from Equation 1 above, the output noise has a

square-root relationship to the Bandwidth.

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