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Design >> Analog Design >> ZeroCrossing Detector - 1.5G
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Message started by despap on Mar 9^th, 2012, 8:02pm

Title: ZeroCrossing Detector - 1.5G
Post by despap on Mar 9^th, 2012, 8:02pm

Hi all,

Problem Statement:
VCC = 1.8 - 2.0V
Process details: VT ~ 500mV nominal
Ft > 6GHz
Ibias varies +/-10% over and above Poly-Resistor variation.

I have a two single-ended fully differential signals,each 50mVPP, on common mode of VCC,max frequency of 1.5GHz.
This needs to be converted to CMOS levels. ( 0-VCC swing) with minimal affect on Duty cycle at the output.

Any suggestions please..

Thanks,
desPap

Title: Re: ZeroCrossing Detector - 1.5G
Post by loose-electron on Mar 10^th, 2012, 12:42pm

clarify the question

"two single ended fully differential signals"

does not make sense.

is that 4 wires and 2 signals?
is that 2 wires and one signal?

what is the max-F and min-F of the signal?
You give only one.

I think you need an AC coupled, auto zeroed comparator,
but need to understand what you are looking for first.

Title: Re: ZeroCrossing Detector - 1.5G
Post by despap on Mar 20^th, 2012, 2:57am

Two signals:
Both referred to Ground

V1 = 25m*sin(wt)
V2 = 25m*sin(wt+180)

Frequency - 1G to 1.5G

Title: Re: ZeroCrossing Detector - 1.5G
Post by loose-electron on Mar 20^th, 2012, 7:24am

Research:

Differential Current Steering Logic

At those frequencies this is probably where you want to go.