wired thing is how does it?complete the positive feedback? based on the given analysis it's only negative feedback. I always have the feeling that frequency should be 1/Nt
So, the width of the tp is based on the capacitor we choose? If the frequency does not meet our requirement, should we change the value of the capacitor?
From the Wikipedia page for Voltage-Controlled Oscillator: "The frequency of a ring oscillator is controlled by varying either the supply voltage, the current available to each inverter stage, or the capacitive loading on each stage."
That question does not have a straight forward answer. Both PMOS and NMOS go through each region during a transition. If you want a good visual aid, I recommend googling "VTC of CMOS Inverter". Here is a good example with a small typo: www.electronics-tutorial.net/Digital-CMOS-Design/CMOS-Inverter/VTC-CMOS-Inverter/Fig6-VTC-CMOS%20Inverter.png If you give the inverter a rising edge (low-to-high voltage) the MOSFETs will go though the regions in the following order: PMOS Linear, NMOS OFF PMOS Linear, NMOS Saturation PMOS Saturation, NMOS Saturation PMOS Saturation, NMOS Linear PMOS OFF, NMOS Linear If you give the inverter a falling edge (high-to-low voltage) it is the reverse order.
wired thing is how does it?complete the positive feedback? based on the given analysis it's only negative feedback. I always have the feeling that frequency should be 1/Nt
So, the width of the tp is based on the capacitor we choose? If the frequency does not meet our requirement, should we change the value of the capacitor?
Yup. And yup, we could totally do that.
From the Wikipedia page for Voltage-Controlled Oscillator:
"The frequency of a ring oscillator is controlled by varying either the supply voltage, the current available to each inverter stage, or the capacitive loading on each stage."
Hi, The MOS used in inverters is operated in which region?
That question does not have a straight forward answer. Both PMOS and NMOS go through each region during a transition.
If you want a good visual aid, I recommend googling "VTC of CMOS Inverter". Here is a good example with a small typo: www.electronics-tutorial.net/Digital-CMOS-Design/CMOS-Inverter/VTC-CMOS-Inverter/Fig6-VTC-CMOS%20Inverter.png
If you give the inverter a rising edge (low-to-high voltage) the MOSFETs will go though the regions in the following order:
PMOS Linear, NMOS OFF
PMOS Linear, NMOS Saturation
PMOS Saturation, NMOS Saturation
PMOS Saturation, NMOS Linear
PMOS OFF, NMOS Linear
If you give the inverter a falling edge (high-to-low voltage) it is the reverse order.