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Forum: RDM Physical Layer/Hardware Discussion

December 5th, 2006

Replies: 3

3.3V Biasing

Views: 15,410

Posted By Nigel Worsley

Th equations are: Vbias = Vcc * 1 / ( 1 /...

Th equations are:

Vbias = Vcc * 1 / ( 1 / Rt1 + 1 / Rt2 ) / ( 1 / ( 1 / Rt1 + 1 / Rt2 ) + R1 + R2 )

Rterm = 1 / ( 1 / Rt1 + 1 / ( R1 + R2 ) )

The specification requires Vbias to be...

Forum: RDM Physical Layer/Hardware Discussion

November 30th, 2006

Replies: 3

3.3V Biasing

Views: 15,410

Posted By Nigel Worsley

Change Rt1 to 150R and R1, R2 to 390R. This...

Change Rt1 to 150R and R1, R2 to 390R.

This gives almost exactly the same bias voltage, and is reasonably close to the 120R impedance requirement ( 126R ). Using difficult to obtain ( in small...

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