single-ended to differential conversion

[Braski]

Is there a general and quite simple way to convert a single-ended signal, let's say Vref+Vs to a fully-differential signal Vref+Vs/2 and Vref-Vs/2? I am trying to figure out something..

 

[johnjoe]

Hi,

for which frequency range?

Regards

 

[Braski]

Hi,

for which frequency range?

Regards

base-band (i.e. with opamps, not baloons). I look for something simpler than the differential line driver seen elsewhere.

 

[johnjoe]

base-band (i.e. with opamps, not baloons). I look for something simpler than the differential line driver seen elsewhere.

If you are not using DC, simplest way would be a transformer!

Regards

 

[Braski]

the board is IC design and layout. I mean with an electronic circuit!

 

[johnjoe]

the board is IC design and layout. I mean with an electronic circuit!

Ah sorry,

than maybe a catodyn circuit will help:

A common emitter/source amplifier with resitive emitter degeneration. Than you have both signals (0/180), if you take signal from collector and emitter. But it is helpful to use additionally some buffer because of different output impedance at the collector and emitter.

I used this circuit already in rf-ic designs.

Regards

 

[FvM]

I look for something simpler than the differential line driver seen elsewhere.

If you want OP accuracy, a fully differential OP or two regular OPs are the minimal requirement.