ONET4201LD: Using ONET4201 as transconductance amplifier

Yannish Ramgulam

Part Number: ONET4201LD

I have an application where I need a transconductance amplifier/buffer with >= 400MHz of bandwidth

I can't find any off-the-shelf part for this

Are the Input buffers stages given in Figure 1 of the datasheet linear? Or are they purely made for digital signals?

If they are linear could I use this chip as a transconductance amp, driving it with small-amplitude (<1Vpk) sinewave signals instead of digital (square) CML signals?

Inputs would be differential IQ signals (so 1 chip for I and 1 chip for Q)

I know this is not the intended use of the chip so I'm not looking for any commitment that it would work: I just want to know if it's theoretically feasible with this chip or if it's not possible at all and I should drop the idea

Thanks for your help

Y.Ramgulam

over 2 years ago

0 Nasser Mohammadi over 2 years ago

TI__Guru* 91120 points

Hi KR,

ONET4201 has not been used or has not been characterized for this type of application. I have a enclosed link with TIA products which could be more applicable for what you want to do:

https://www.ti.com/interface/optical-networking-ics/products.html#p1241=Transimpedance%20and%20limiting%20amplifier;Limiting%20amplifier

Regards ,, Nasser

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ONET4201LD: Using ONET4201 as transconductance amplifier