TSH120

Power supply considerations

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Power supply considerations

Correct power supply bypassing is very important for optimizing performance in the high-

frequency range. A bypass capacitor greater than 10

μF is necessary to minimize the

distortion. For better quality bypassing at higher frequencies, a capacitor of 10nF must be

Figure 20.

Circuit for power supply bypassing

Figure 21 shows the noise supply rejection improvement with bypass capacitors expressed

by:

20 log (

Figure 21.

Noise supply rejection

+V

CC

C

+

C

TSH120

+V

CC

C

+

C

TSH120

10k

100k

1M

10M

100M

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

Vcc=+3.3Vdc+0.2Vac

Load=150

Ω

C

LF

=10uF

C

HF

=100nF

Frequency (Hz)