Cirrus-logic AN300 REV1 Uživatelský manuál stáhnout pdf (Strana 7)

AN300REV1 7

AN300

inside the Cirrus Logic CS3001/2/11/12 amplifiers. Note that although not shown in the diagram, the signal is

chopped as a differential signal.

Figure 9. Block Diagram of Cirrus Logic’s Multipath Chopper-stabilized Amplifier, CS3001/02/11/12

The "multi-path" approach to these amplifiers was used to achieve 300 dB of open loop gain. These amplifiers can

be made stable for gains higher than 50X with a single feedback capacitor. They offer significant improvement over

competing amplifiers when an amplifier with low noise, low offset drift and very high open loop gain is required for

an application. Figure 10 illustrates the open loop gain and phase of the CS3001/2/11/12 amplifiers. Figure 11 illus-

trates an expanded view of the region of the open loop gain and phase above 10 kHz.

Figure 10. Open-loop Gain and Phase vs. Frequency, CS3001/02/11/12

AMP1

AMP2

AMP3

AMP4

AMP5

OUT

High-frequency Path

φ1

Gain

Phase

1 2 3 4 5 6 7 8 9 10 11 12 ... 15 16

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Cirrus-logic AN300 REV1 Uživatelský manuál Strana 7