What kind of amplifiers and architectures are used for LVDS receiver?

[E-goe]

Hi all

General question:

What kind of amplifiers did you guys see in an LVDS receiver. The LVDS receiver needs to translate theLVDS input signal to an CMOS differential signal.

What should be a suitable architecture for it? PMOS/NMOs input differential amplifier or something more advanced architectures?

Let me know your thoughts/experiences

Greetz ,

E-goe

 

[Areky_qin]

LVDS receiver

this topic have been discussed many times,







best regards

 

[E-goe]

Re: LVDS receiver

Thanks ericzhang,

The link to the documents you gave all disccus LVDS transmitters. Neither off them describe an LVDS receiver.

As in the TIA/EIA -644-A the specs for an LVDS receiver are mentioned as:

Common mode can vary 0.05V and 2.35V and the differential voltage can vary between 100mV and 600mV I am wondering what kind of an amplifier/archtecture can translate this input specs to an differential CMOS compatible output.

It doesn't seem one of the traditional amplifier archtitecture ( e.g. differential amplifier, cascode, miller OTA, symm OTA ) can provide this wide range of common mode signal at the input and still give a CMOS output voltage ( 0V = low 3.3V = high).

Greatly appreciate any feedback

E-goe

 

[jonashat]

LVDS receiver

I haven't designed any LVDS before, but I'd assume the first thing is a level shifter circuit (as digital people would call it) or a comparator/Latch (as analog people might refer to it).

It should be a diff pair with a cross-coupled load and then followed by CMOS inverters. This is the simplest I can think of.

Keep in mind that you're not trying to amplify a signal with analog data, it is all digital so linearity and gain variations don't matter to the signal integrity.

 

[ericzhang]

LVDS receiver

E-go:

Some architecture propsed by some papers:
1.Level shifter before OPA;
2.Rail to Rail input amlifier;
3.Champwell amplifier( self biased amplifier);

Hope you can find suitable architecture.

BR

ericzhang
12/15

 

[ravet]

Re: LVDS receiver