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Compare inverter and OTA in SC-amplifier. (Read 2429 times)
Jacki
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Compare inverter and OTA in SC-amplifier.
Dec 19th, 2012, 6:19am
 
Hi,

   I have two questions about inverter design. I want to design a SC-amplifier by using inverter to replace OTA.
   First is how to calculate the power consumption of inverter? Is it the same way as we calculate the digital power consumption?
   P=(1/2)*VDD(square)*fs*CL
fs is sampling frequency, CL is the load.

   Second is for SC-amplifier based on OTA, gain bandwidth product of OTA is important for settling. Is it the same for inverter, if I use inverter instead of OTA. Do they have the same spec. for gain bandwidth product?

   If somebody have good references for inverter design, could you please introduce to me.

   Thank you.

  Jacki.
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boe
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Re: Compare inverter and OTA in SC-amplifier.
Reply #1 - Dec 20th, 2012, 5:34am
 
Jacki,
Jacki wrote on Dec 19th, 2012, 6:19am:
... [H]ow to calculate the power consumption of inverter? Is it the same way as we calculate the digital power consumption?
   P=(1/2)*VDD(square)*fs*CL
No. the digital power formula just gives you the power needed to recharge the load cap.

- B O E
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Jacki
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Re: Compare inverter and OTA in SC-amplifier.
Reply #2 - Dec 20th, 2012, 6:35am
 
Hi boe,

   Thank you. Now I use iprobe and calculator in spectre to get the average current, then I think I can use this value to estimate the power consumption.

   Jacki.
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