Help on identifying source of unwanted harmonics

Thread Starter

padhu84

Joined Dec 15, 2009
21
Hmm ok SgtWookie

Before i add it, another trivial question. Say i add a polarized cap, since i am dealing with -1.8V, the cap is to be connected in a way such that + of the cap is grounded rite? similar to the 10uF at Vout of Tl7660. I know its a sort of silly question but just reconfirming to avoid any cap blow-up :p
 

SgtWookie

Joined Jul 17, 2007
22,230
The negative lead of a polarized cap must always be connected to the more negative side of the circuit.

So yes, you would connect the + lead of the cap to ground.
 

Thread Starter

padhu84

Joined Dec 15, 2009
21
Tried it. No respite. There is no change in the frequency response. Can still see the spikes at the aforementioned frequencies.:(

Added 12Ohm resistor with a 47uF and 33uF on either size of the resistor on the path of supply to V- pin of opamp.

Any takes, SgtWookie?
 
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