Dec 21, 2007 #1 T totoro Member level 1 Joined Jun 27, 2004 Messages 38 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,286 Activity points 246 In error amp design for buck converter, why OTA can only use in open loop error while OP can used in close loop shown in the attachemt. And the comparing ramp signal is from 0-Vpp or can be design as any vlow to vhigh? Thanks
In error amp design for buck converter, why OTA can only use in open loop error while OP can used in close loop shown in the attachemt. And the comparing ramp signal is from 0-Vpp or can be design as any vlow to vhigh? Thanks
Dec 21, 2007 #2 R rajanarender_suram Full Member level 4 Joined Jan 20, 2006 Messages 214 Helped 22 Reputation 44 Reaction score 10 Trophy points 1,298 Activity points 2,375 Vout(s)/Vc(s) should be same whatever the ckt you use, if you find the transfer func for both the ckts it will be same by these configuration
Vout(s)/Vc(s) should be same whatever the ckt you use, if you find the transfer func for both the ckts it will be same by these configuration
Dec 22, 2007 #3 G gpwu Member level 2 Joined Dec 7, 2007 Messages 49 Helped 6 Reputation 12 Reaction score 2 Trophy points 1,288 Activity points 1,486 The gm amp output is current = Gm*vin, and there is an error voltage, vin. The opamp's input & output are voltage, vin~0 if gain is high. the ramping level need to be in a range so that circuit works in linear mode.
The gm amp output is current = Gm*vin, and there is an error voltage, vin. The opamp's input & output are voltage, vin~0 if gain is high. the ramping level need to be in a range so that circuit works in linear mode.
Dec 23, 2007 #4 B babbage Member level 1 Joined Aug 15, 2005 Messages 38 Helped 5 Reputation 10 Reaction score 0 Trophy points 1,286 Location China Activity points 1,503 In fact, I think tat it is not easy to explain this. Maybe u can ct me by mail, babbage.song@gmail.com
In fact, I think tat it is not easy to explain this. Maybe u can ct me by mail, babbage.song@gmail.com