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Re: common mode gain is positive for extracted fully differential OTA
Thanks for your reply, freebird.
The case is resolved. I talked with Junus2012, the owner of the previous post above. After carefully reviewing the open loop output with common mode input, I find the post-layout result is...
I have the exact same problem as the below post, don't understand why the thread is closed and I still have no clue why I have positive common mode gain.
https://www.edaboard.com/showthread.php?384934-CMRR-is-less-than-the-DC-differential-gain
I use calibre, specifically select the ground node...
I see a circuit below and wonder why the left two branches are needed?
Why not just allow the 100uA current mirror to source the M1 in diode connected? What's the purpose of M0/M3/M4/M7/M10?
Size of M10 is same as M4.
I want to output the waveform in specific format in order to use Matlab/Python for post processing, because I am not that good in aligning format, I want to add comma to output csv format from Ocean script. Does anyone know how to do it in Ocean? Or is there any simple code example in Python or...
Hi CataM:
Do you mind share me more thoughts regarding the broadband load matching? as the LC circuit can only match at one frequency while my design will be from baseband to 400MHz.
Hi, FvM:
I think I can actually mark this question as solved because with the help from all the replies, I have found the meaning of impedance matching as my previous reply shows. I don't intend to push the question further as how should I design this filter to satisfy all requirements. From...
Maybe something is not mentioned. The original designer of this circuit is not with this group any more, so I have to guess what they are doing. I find out the impedance of the LC network by Cadence sp analysis (circuit on the right starting from the 350fF capacitor).
It shows that when...
Hi, Mtwieg:
I just realized the role of a 10k Ohm res to AC ground at the loading stage (see figure, the original structure is fully differential, I thought the 10K ohm is part of a DC bias point feedback loop). I think that is what you mean the loading. It also defines the lower side cut off...
Hi, Niki:
bandpass filter is correct or more specifically from my perspective, it's a 5th order elliptic low pass filter with AC coupling load.
I just realized the 10K ohm resistor's role in the loading stage, so I added it in my figure below. Hence the low frequency cut off is 3Mhz.
About...
I am designing a filter with a notch at 800MHz to block interference while keep the BW of the filter >=400MHz, it's a baseband analog signal. The input is a source follower with a 100 ohm res in series (1/gm=20). The output of the filter is connected to a source follower, which I assume is a cap...
I can understand the part of source/load impedance contribute to the overall transfer function. Do you have any book to recommend?
This frequency domain transfer function satisfy my requirement but what I think is that it seems there are some other requirements that I miss to consider...
Can I have the question more specific?
I have the below circuit simulated in Cadence ADE
By varying the source impedance from 50 Ohm, 120 Ohm to 1K Ohm, I obtained 3 difference AC response as below. Can I use this circuit or not because I don't have source impedance matching?
I am really...
How to understand the reflection or loss of signal integrity if there is no transmission line? For example, the time for the signal reflected is so short that you can just view the circuit as lumped element with Voltage source, source resistor and load impedance, total three components.
I have a low pass 5th order passive elliptic filter from another design. When I try to modify it, I was told that I must keep the input and output terminated properly.
I thought I just need to guarantee its AC response satisfy my requirement (BW and notch in elliptic filter). I don't...
I think it's less sensitive to component PVT variation.
I search in edaboard to find this post. Can anyone provide some good tutorial or book for design passive RLC ladder filter with transmission zeros?
I have a notch filter designed with this structure but I cannot understand how it is...
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