2022-11-10 15:10 Tags: # Ring oscillator  An odd number of inverters connected in a loop. That makes this an unstable circuit, so if the output is High, it will propagate back to low. Simplest way to make an oscillator on a chip. $f_{osc}=\frac{1}{2\cdot N\cdot t_{pd}}$ #### Drawbacks - Poor [phase noise](phase%20noise.md) #### Uses - VCO (for simplicity) Replace the inverters with [current-starved inverters](current-starved%20inverter.md) to make it voltage controlled. [^1] --- # References [^1]: [vr-4602-wk09-sc02-gateusefunction](../../Spaces/University/ELEC4602%20–%20Microelectronics%20Design%20and%20Technology/Lectures/W9/vr-4602-wk09-sc02-gateusefunction.mp4)