Power supply considerations and improvement of the PSRR

TSH346

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Power supply considerations and improvement of the

PSRR

Correct power supply bypassing is very important to optimize performance in low and high-

frequency ranges. Bypass capacitors should be placed as close as possible to the IC pin

necessary to improve the PSRR in low frequencies. For better quality bypassing, a capacitor

improve the noise supply rejection in the higher frequency ranges. A coil can be added in

order to better reject the noise from the supply and to prevent current peaks as much as

possible.

Figure 21. Circuit for power supply bypassing

C

LF

+

C

HF

TSH346

R

G

B

4

5

Coil

AM00824