TSH346 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

TSH346

Triple video buffer/filter for HD video applications

STMicroelectronics 

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TSH346

Power supply considerations and improvement of the PSRR

Figure 22. Circuit for noise rejection improvement measurement

S

R

+5 V

T - bias

Coil

CHF

+

CLF

50 7

TSH346

50 7

AGILENT

4395A

A

AM00825

Figure 23 shows how the power supply noise rejection evolves versus frequency depending

on how carefully the power supply decoupling is achieved.

Figure 23. Power supply noise rejection

0

Vcc=5V(dc)+0.2Vp-p(ac)

-10 Decoupling capacitor: 10µF+100nF

Load=150Ω

-20 Noise rejection=20 log (ΔVCC/ΔVout)

-30

no coil

-40

-50

-60

-70

coil=560µH

-80

10k

100k

1M

10M

Frequency (Hz)

100M

9/18

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