[SI-LIST] : pecl termination

About this list Date view Thread view Subject view Author view

From: Binoj G. S. (binoj@cepz.net)
Date: Wed Jun 06 2001 - 05:25:29 PDT


HELLO ALL,
               
             I am using a differential pecl to ttl and ttl to differential pecl translator in my design in which the differential pecl o/p is using to drive one fo transceivers(hfbr 5903).As the fo transceiver i/p are in a different level I used capacitor coupling and biased the differential o\p at the fo i/p side.what I did is, biased the lines to middle of fo i/p (1.96v) with a thevenin termination which provides a 50 ohm impedance.
But what I read is that the termination voltage should be vcc-2,i.e. 1.3v(3.3-2).How can I satisfy both of this condition or I am doing something false?The fo I/p levels are as follows
     vil min-1.49v vil max-1.825 vih min-2.135 vihmax-2.42
Thanks for replying
Binoj

----- Original Message -----
From: Michael Werner
To: Rengarajan S Krishnan
Cc: John Mackay ; 'Romeo Iacobut' ; si-list
Sent: Wednesday, June 06, 2001 3:28 PM
Subject: Re: [SI-LIST] : LVDS

The link is:
http://www.computer-design.com/Editorial/1999/03/0399a_case_for_low_voltage.html

M. W.

Rengarajan S Krishnan wrote:

  Is an online version available? I dont have access to this magazine.
  Thanks
  Krishnan

  John Mackay wrote:

      
    hi Romeo
    nice long LVDS article in Electronic Systems mag, March 1999, by
    guys at National Semiconductor. Also, the canonical "MECL
    Handbook" by Blood, of Motorola, establishes basic concepts.

    --

**** To unsubscribe from si-list or si-list-digest: send e-mail to majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu ****

**** To unsubscribe from si-list or si-list-digest: send e-mail to
majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****


About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Thu Jun 21 2001 - 10:12:16 PDT