Re: how to increase the input impedance for a ring oscillato
Hi beabroad,
After looking at your schematic, it appears that when you measure Zin of the
ring oscillator, you are measuring the Zout of the diode connected FET, which
should be of the order of 1/gm. So, 100mohm is a reasonable measurement.
Also, why do you want this impedance to be high ? What you want is to have
a large change in current for a small change in voltage at the control node,
which translates into a low impedance, not high. So, you should be OK.
What is it about the ring oscillator performance that does not meet yhour spec ?
Cheers,