[SI-LIST] Re: basic question regarding inductor before Vcc
- From: Pratap Narayan SINGH <pratap.singh@xxxxxx>
- To: roymesi@xxxxxxxxx
- Date: Mon, 20 Jun 2005 15:51:45 +0530
Roy,
bonding wires inside chip has some inductance ( 10nH approx
) and analog designars try to model that for their simulations only.
because of bonding wire inductance ; supply voltage inside is different
than the voltage at the pin . this voltage difference
depends on the supply current rate of change.
hope i could explain it properly
pratap
Roy M. wrote:
>Hi,
>can someone explain to me why the board designers put inductors just before
>the Vcc connection? is it some kind of filter against noises?
>I understand that when you put a resistor, it is intended for lowering the
>voltage or for pull-downs... but what's the logical explanation for putting an
>inductor?
>Thanks,
>Roy
>
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--
Pratap Narayan Singh
HPC/IP & Design
STMicroelectronics Pvt. Ltd. logo
Plot No.2 & 3
Sector-16A, NOIDA-201301
Tel: 91-120-2512021-30 Ext 6597
Fax: 91-120-2515260
e-mail: pratap.singh@xxxxxx <mailto:pratap.singh@xxxxxx>
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