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A kind of tuning circuit in Gm-C filter

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2steps

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Hi, all:

I design tuning circuits for gm-c filter to compensate the gm's variation due to process,temperature and aging.
My reference is form the book"Wireless.Communication.Circuits.And.Systems", and details in accessories. But I have some questions below,please help me check them.

1.The Gm cell in the “Tuning circuits” (accessories) is single-ended or should be balanced ,just like those gm cells in filter ?

2. I was confused by those sentences “The arrangement uses a control loop comprising a skewed ‘diode-connected’ transconductor −G0 which generates a quiescent voltage which is offset from that of the reference transconductor” What does “offset” mean? How to explain it ?

Thanks!!

 

Hi, friend
1, I think you should use the same Gm cell as that in filter.
In fact, I use the Gm cell in filter as a part of tuning circuit. So balanced one should be used.
2, I think 'offset' is a DC difference. You should refer to the whole design to explain it. But the purpose of it is to make sure the gm cell is same with that in filter.

Good luck
 

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    2steps

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Hi,jecyhale

Thanks for your kind help! The whole design reference paper is attached .

I designed the tuning circuits based on single-end gm cell, You said this tuing circits should use balanced gm cell , I think this will be better for "master-slave" tuning.
But how to transfer this single-end tuning to balanced one?

1. The inverter can be replaced by comparator ?

2. which kind of tuning circuits have you used in practice gm-c filter design ?
Is it using PLL ?


Thanks!
 

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