Designer’s Guide Community :: Forum

Welcome, Guest. Please Login or Register. Please follow the Forum guidelines.

Jul 23^rd, 2024, 3:17pm

	HomeHelpSearchLoginRegisterPM to admin

The Designer's Guide Community Forum › Design › Analog Design › Virtual ground in switched capacitor integrator

‹ Previous topic | Next topic ›

Pages: 1

Send Topic

Print

Virtual ground in switched capacitor integrator (Read 549 times)

jdp Community Member Offline Posts: 42	Virtual ground in switched capacitor integrator Feb 27^th, 2016, 4:39am Hi, In a switched capacitor integrator (figure attached), it is said that the inverting input terminal of the op-amp is a virtual ground. How can we explain that? - because there is no resistor used in parallel to the feedback capacitor to ensure negative feedback!
Back to top	sc_integrator.PNG -- jdp IP Logged

raja.cedt Senior Fellow Offline Posts: 1516 Germany	Re: Virtual ground in switched capacitor integrator Reply #1 - Feb 27^th, 2016, 8:33am Interesting Question. During Phase-2, you have -ve feedback because of the capacitive potential divider. You need a resister in case if you have resister the opamp input like we do have in case of integrator. Hope this helps, Raj.
Back to top	Untitled_035.png IP Logged

jdp Community Member Offline Posts: 42	Re: Virtual ground in switched capacitor integrator Reply #2 - Feb 27^th, 2016, 7:31pm Thanks Raja for your explanation !!
Back to top	-- jdp IP Logged

Pages: 1

Send Topic

Print

‹ Previous topic | Next topic ›

The Designer's Guide Community Forum » Powered by YaBB 2.2.2!
YaBB © 2000-2008. All Rights Reserved.