[SI-LIST] Re: AW: Bandwitdh of Balun
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 09 Jan 2014 14:59:22 -0800
At 5GHz it doesn't take much parasitic capacitance to unbalance a balun.
Steve
On 1/9/2014 10:13 AM, sunil bharadwaz wrote:
> Thanks Steve & Gert ,
> I have made a board to check the Balun alone . No other components are there
> , except the
> Balun itself & three SMA connectors .However , i have used a 4 layer layout (
> with full
> continuous Gnd plane , in the Layer-2 ) . My 50 ohm lines are 15 mil wide CPW
> lines with
> Gnd away by 18 mil on each side. My return loss is fine in the 400 Mhz band .
> However ,
> the Vendors reference board uses a two layer layout ( with obviously thicker
> traces ).
> The return loss on the Vendor's board holds good for about 800 Mhz .Should i
> try doing
> a 2 layer layout . Does it help Band width in any way ? Or does thicker
> dielectric between
> the L1 & Gnd plane in L2 help the Band width in any way ?
>
> Hi Steve , How does etching on L1 & L2 effect the Band width ? ( I'am
> referring to your comment).
> Pls help me understand your comment better .
>
>
> Regards
> Sunil.B
>
>
>
>
> On Thursday, January 9, 2014 2:26 PM, "Havermann, Gert"
> <Gert.Havermann@xxxxxxxxxxx> wrote:
>
> Look for return currents and split planes. In case of 2 Layer design a split
> plane may be hard to find as it belongs to the position of the GND vias.
> And check if the Balun is the source of the error or if it is some other
> component. Check by simply replacing the Balun with terminating resistors.
>
> BR
> Gert
>
>
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> -----Ursprüngliche Nachricht-----
> Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
> Auftrag von sunil bharadwaz
> Gesendet: Mittwoch, 8. Januar 2014 17:38
> An: SI LIST
> Betreff: [SI-LIST] Bandwitdh of Balun
>
> Hi Guru's
> We are testing a ceramic Balun ( 5.1 Ghz to 5.9 Ghz ) , from a popular Vendor
> .
> The Vendor's Eval board shows good return loss for almost 800 Mhz band ( 2
> Layer Layout)
>
> However , when laid out on our actual boards , we are finding it hard to get
> return loss for higher than 400 Mhz in our 4 Layer Layout . I just want some
> one to bounce off some ideas , as what could be there in the Layout , which
> could be causing the narrowing down of the bandwidth .Needless to say the
> Vendors lay out recommendations are being followed to the best possible
> .Sorry , if the question sounds little vague . Would be grateful if some
> ideas can be bounced off .
>
>
> Regards
> Sunil.B
>
>
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