All Questions
16
questions
0
votes
1
answer
245
views
the inverter switching point
As we know the mobility of the "nmos" device is 3x greater than "pmos", and when we want to correct the switching point of an inverter for vdd/2 we usually change the W of the &...
0
votes
1
answer
352
views
What happens when there is a current source at the drain and gate is GNDed?
In the circuit below, Vin = 0V and there is a 10 uA current source connected to 5V and the drain of the NMOS. Say there is a large resistance R1 at the source and the transistor's W/L is large and Vth ...
- 1
1
vote
0
answers
240
views
Why choose pmos over nmos
In the attached schematic, there are two branches. The branch on the left has a pmos + nmos transistor. The branch on the right has two nmos transistors. The sizes of the devices were selected such ...
- 29
0
votes
2
answers
349
views
Characterizing "quadratic current" in an NMOS
I'm designing an integrated circuit where a series of NMOS with their sources tied to GND and their drains tied together work as parallel current sources. The total added current \$I_D\$ that I'd like ...
- 167
3
votes
2
answers
1k
views
Intrinsic gain of NMOS
In Razabi's Design of Analog CMOS Integrated Circuits textbook, the example 3.2 asks for the small signal voltage gain of the circuit below:
He explains that since the current source I1 introduces an ...
- 447
1
vote
0
answers
48
views
Increasing supply rails for low size MOSFETs
With decreasing sizes of MOSFETs, the supply voltage has also scaled down so as that the electric fields in the device are not large enough for them to breakdown. However if this depends only on ...
0
votes
1
answer
66
views
MOS device sizes
Hello guys! I just want to ask what's the difference between the actual W/L and the W/L shown at the image below? I'm kind of confused. Thank you!
- 31
0
votes
1
answer
111
views
Sharp transistor cut off outside active region
I'm building a simple temperature controlled NMOS switch for regulating the speed of a fan.
It's a 12V fan and the controller works great (as long as the transistor is in it's active region.)
This is ...
0
votes
1
answer
2k
views
Working of NMOS as a capacitor
I came across instances where NMOS was used as a capacitor in analog circuits. This is done by shorting the drain and source. The drain/source acts as one terminal of the capacitor while gate acts as ...
1
vote
0
answers
262
views
Is a cascode better current source than current mirror ? Which option is better?
I have simulated a cascode and made a M2 in saturation so it will act as a current source. I want to understand which current source is better. Is cascode better because it has a higher output ...
0
votes
2
answers
2k
views
Understanding Minimum Output Voltage of Cascode Current Mirror
I guess that I have some serious trouble understanding how to get the saturation equation for the cascode current mirror right which is known from all the textbooks as
$$
V_{out} = 2 V_{DS, sat} + V_{...
- 23
1
vote
1
answer
216
views
(PSPICE) Memristor-Based IF Neuron Circuit: What is this NMOS?
This is a memristor-based IF neuron circuit.
My question is, i'm trying to simulate this circuit in PSPICE. However, I am unsure what the N-MOSFET characteristics (M1) are in the circuit diagram. I do ...
- 147
2
votes
0
answers
10k
views
MOSFET Parameters LTSpice
This is the LTSpice model of the Fairchild 2N7002 NMOS transistor.
...
- 361
0
votes
3
answers
758
views
Current source load mosfet
Guys I have a silly doubt. above is a standard circuit. I wish to ask how can a small signal current exist through the transistor shown above? The current source ( which is dc) will always force the ...
0
votes
1
answer
5k
views
Bias common source diode connected load
To amplify small signal we need to bias M1 and M2 in saturation mode.
Obviously, M2 is always in saturation because Vgd = 0.
However, how should I bias M1 in saturation?
- 1,649