Re: Use of Bias resistor
Bias means putting some standing current or voltage across/into some device to improve it's performance.
Did you mean that putting a resistor across your measurement terminals the noise went down? As you mention ripple and noise, I guess you are using an oscilloscope, or how do you know what the signal consists off? All measurements are two terminal, normally one is "common, or earth". The input impedance of an oscilloscope is at least 1M ohm, so it will pick up radiated signal from the mains hum to the local radio station, especially if the leads to it are long and unscreened. Putting a resistor in parallel will reduce the input impedance so the effects of pick up are reduced, BUT you are loading your circuit, which may be unable to supply the correct voltage into a low value resistor.
Frank