analog_ambi
Member level 1
Hi,
I am designing a low power current starved ring oscillator as shown in attachment. The bias current for each inverters is in the range of 50n to 100nA.
M1 M4 are in strong inversion saturation and act as current sources. i have made w/l very small like 1/40 to put them in strong inversion.
How do i size M2 M3? If i size for general inverter like 4/1 and 2/1 then they will be in weak inversion during switching at such low currents. Is that OK?
OR should i size them with w/L small so that the are in strong inversion?
I am designing a low power current starved ring oscillator as shown in attachment. The bias current for each inverters is in the range of 50n to 100nA.
M1 M4 are in strong inversion saturation and act as current sources. i have made w/l very small like 1/40 to put them in strong inversion.
How do i size M2 M3? If i size for general inverter like 4/1 and 2/1 then they will be in weak inversion during switching at such low currents. Is that OK?
OR should i size them with w/L small so that the are in strong inversion?