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I don't see any reason you need introduce SNR to our discussion. I don't need gray & meyer to know differential output has double the signal swing at output compared to single ended. So far I haven't seen anyone tried to use fully differential opamp output single-ended (though some people apply...
Due to the nature of fully differential opamp, noise from CMFB shall not contribute much to the differential output signal. I don't understand your claim "noise has a attenuation of 10dB of power in differential circuits". Provide more details please. And I don't see why it is relevant here...
how many periods are used to measure thd
In amplifiers, if the input signal frequency is low enough, I would suggest avoid transient sim (+DFT) or flex-balance (just like HB) in Spectre(RF).
The easiest way is to use DC simulation, and through VerilogA function and calculator to find the...
I won't worry about noise at all since your output is differential. All noise contribution from CMFB loop is common mode -- it won't be visible at the differential output.
Resistor sensing will cause lower differential mode open loop gain at the output - if the resistor too low, more distortion...
It's nice to first generate higher than 1.5x voltage, then place a MOS in series at output, use feedback to control gate of MOS.
You can either use PMOS (just like a LDO) or a NMOS (HDO) for the regulation.
I prefer HDO approach because even at the frequency beyond your close loop bandwidth...
stability analysis iprobe
Thanks to Middlebrook, his great double-injection method. Thanks to Tian and Kundert, you have iprobe and cmdmprobe in spectre. Stb analysis is just one click away.
You know all the basics of feedback control and the idea behind Nyquest stablity criteria. But, watch...
The question is kind general. Typically current under concern needs be converted to voltage before a peak detector ckt (either based on feedback or just like a rectifier). Just remember log amp typically can take current input and offer ~90dB DR.
To make the i-v conversion, there are quite a...
For fully diff op amp, use ideal balun in your diff mod signal sim.
In terms of cmrr, psrr, you have to use post-layout sim (R-C extracted view) in your sim. Plus Monte Carlo.
Schematic sim would just give you some number totally nonsense.
Can you afford feedback control?
A high speed opamp (either voltage mode or current mode) shall serve you well in moderate frequency applications.
Actually emitter degeneration is a feedback example essentially.
If you run at high frequency, try feedforward/preditortion as in PA design...
matlab programming + clock and data recovery
Razavi's book is a good resource.
I always feel it would be interesting to use sampling data model, i.e. Z transform to describe CDR. It's very useful if you consider the statistic nature of transition density --- you won't be short of equations...
constant gm bias circuit
Some comments on positive feedback:
There is simply no need to be afraid of positive feedback.
Actually it's is very common in ckt design:
Widlar uses it in one of his earliest OPAMPs to boost gain; latch(static memory) ckts are all positive feedback; most bandgap...
As usual I'd like to ask what frequency your measurement is concerned. Is it single ended or differential?
DC test is simple.
For high frequency, a modern 4-port network analyzer shall serve your need well if you are not testing DC and extremely high Zin. Convert the Sdd11 to Zdd11 and use...
I guess beabroad is referring to burst-mode CDR in optical communication systems, which is recently inspired by the high demand of GPON transceivers in Asia (Japan and China).
Up to date, I don't get a good design reference in this type CDR. Actually you will find the reference for burst-mode...
here is the link to power electronics lab at UCI
http://www.eng.uci.edu/pel/pel.html
their publications:
Z. Lai and K. Smedley "A New Extension of One-Cycle Control and its Application to dc-ac converters," IEEE Transactions on Power Electronics, Jan. 1996, Vol. 11, No.1, P99-104.
M. Smith...
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