Questions tagged [saturation]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
1answer
70 views

Can the saturation of an OPA influence its input?

I am working with an analogue processing circuit, finishing with 2 non-inverting OPA one after the other. To characterise the noise produced by the circuit, I wanted to add a third non-inverting OPA ...
0
votes
1answer
103 views

What would be the peak voltage value of two combined signals (one noise and one sinusoidal signal)?

As I learned before, the peak voltage value of two combined sinusoidal signals is the sum of the two amplitudes, for example, \$0.6\sin(ax) + 0.8 \cos(bx)\$ can be \$+1.4\$V or \$-1.4\$V. Would it be ...
0
votes
1answer
1k views

Current transformer saturation

I have a current transformer from this page. I tried to measure the secondary voltage Vs when I apply Vp=230 V and I change the Ip, like this: But at some point the voltage Vs is not changing anymore ...
0
votes
0answers
44 views

op amp saturation

I have this circuit which is acting with negative resistance. However when increasing the voltage well above saturation it produces a weird distortion on the output as seen below. can anyone explain.
0
votes
4answers
245 views

What are these transistors doing and how are they working in this VU Meter?

I was thinking of making KITT's voice box from Knight Rider, which is essentially a VU meter. I did some researching and found an appropriate IC, LM3916, http://www.mouser.com/ds/2/405/lm3915-443929....
0
votes
0answers
30 views

Understanding PMOS's and NMOS's

The problem says solve assuming VI = 0, +2.5V, and -2.5V. I know that if VI = -2.5V the MOSFET's are in cutoff and that VDS = 0. and IDP and IDN will = 0, but would V0 also = 0? If VI = 0 the ...
0
votes
1answer
68 views

Instrumentation Amplifier Saturation to Rails

I am working with a TI INA821 Instrumentation Amplifier to try to amplifier a 0-5mV (delta) analog signal off a strain gauge. To reiterate, every DC analog value between the delta of 5mV represents a ...
0
votes
0answers
46 views

Usuing P_channel mosfet to make o normally closed switch

Hi, I am trying to implement a normally closed switch. In the shown circuit: Vcc = 16..60V (Vcc>>Vz) The characteristics of the P-mos are: Vth = -1V Rdson = 0,055ohm The circuit works correctly: in ...
0
votes
1answer
108 views

Why isn't the Saturation Current of a Photodiode the same as its Short Circuit Current?

The formula I see everywhere is: $$ I_{sat} = \frac{V_{bias}}{R_L} $$ But this seems incomplete for the following reason: The larger the resistance is the smaller the Saturation Current, it stands ...
0
votes
1answer
92 views

MOSFET goes into saturation mode much later

I am using IRLML6346 NMOS in LTSpice. Its threshold voltage is Vt = 0.95V. I plotted the graph of Vds(voltage between drain and source) vs Ids(Current from drain to source) for different values of Vgs(...
0
votes
1answer
141 views

NMOS/PMOS Saturation

If I recall correctly, saturation occurs if \$V_{GS}>V_{TH}\$ and \$V_{DS}>V_{Dsat}\$ for NMOS. But is there an upper limit for the voltage? Like, when does a transistor not saturate after ...
0
votes
1answer
135 views

Double BJT circuit with one BJT off and one in saturation

In the circuit below, due to the base voltage, the circuit becomes a common-emitter setup. However, assuming a reasonable value for the base current the BJT should be in saturation. However the value ...
0
votes
2answers
547 views

Why collector current is small in value in saturation mode?

Why is the collector current smaller in value when a transistor is in saturation mode of operation? My guess is that although both the junctions are forward biased, the (forward) currents are '...
0
votes
1answer
168 views

JFET saturation current

Is it possible to analytically calculate Idss for JFET? I tried by setting voltage gate-source to zero, and then finding the drain current, but it doesn't seem to match with the given value?
0
votes
2answers
416 views

Current increase in induction motor

I have an induction motor which is fed by a three phase inverter. I am trying to use vector control with d-axis aligned with the rotor flux vector. I have a load which increases its torque as the ...
0
votes
2answers
1k views

Why Does Op-Amp Output Voltage Always Saturate (in a Non-Inverting Amplifier Circuit)?

I am trying to amplify the voltage measured across a shunt resistor (Rs). I am using a non-inverting amplifier circuit (as shown in the figure). The expected voltage across the shunt is in the 0-50mV ...
0
votes
1answer
107 views

Channel shape of NMOS in saturation

According to the Sedra/Smith Microelectronic Circuits textbook, 6/7 eds., increasing \$v_{DS}\$ beyond \$v_{OV}\$ has no effect on the channel shape and charge. Why is that? It seems as if (...
0
votes
0answers
84 views

BJT Differential Amplifier deliberately saturated?

Happy New Year! I've recently completed a metal detector project (see my recent questions) and I've been going back over some of the parts I didn't fully understand first time around. This question ...
0
votes
2answers
718 views

Correlation between saturation of high current (power) transformer core and load

In an experiment I need high (\$>600A_{max}\$ or \$1200A_{pp}\$) AC currents in a range from 400Hz to 4kHz. The load is simply a short circuit. For this purpose i use a class D audio amplifier and ...
0
votes
0answers
231 views

How does the source voltage change with and without channel modulation?

The description here seems big, but it's only a two minute read. I'm stranded, desperately need help. The variable resistance R in the figure is set to 10K ohms. The first question was to find the ...
0
votes
2answers
724 views

Unsaturated BJT

I'm struggling for an answer to part (c), I can do the first two questions. I know that \$i_C = \beta \times i_B\$, however, I don't know how to calculate the maximum current gain of the unsaturated ...
0
votes
1answer
86 views

Current saturation

I have bought a bunch of 24v LED for the garden, during the first months all of them worked fine, but some after they burned out the power supply. The reason is because they were demanding high ...
0
votes
1answer
588 views

Collector current decreases with the increase of base current in saturation mode of bjt

I'm new to BJT and i'm trying to understand the characteristics of bjt in different modes of it. In my book they explained that in saturation mode of bjt the collector current decreases even if i ...
-1
votes
2answers
195 views

What is the effect of V(CE) to saturation?

I am following this tutorial about transistors. In the tutorial, it is stated that to be in the cutoff region, \$V_{BE}<0\$ and \$V_{BC}<0\$ must be true. The tutorial also states that however ...
-1
votes
1answer
55 views

Depletion NMOS that's saturated at 0V

May seem like a weird request for a part, but are there any Depletion NMOS out there that is already saturated when you apply 0V to gate or if the gate is not connected?
-1
votes
1answer
89 views

Why this operational amplifier is saturated?

my problem is that in this circuit: Where \$\pm V_{cc} =\pm 15V, R1=1k\Omega, R2= 10k\Omega\$, if I introduce a signal like: \$ v_i(t) = 2 \cos{(2\pi 1000 t)}\$, the output voltaje is this: Where ...
-1
votes
2answers
240 views

Opamp output saturates at 1.7V even though rail voltage is 5V

simulate this circuit – Schematic created using CircuitLab I am working on following circuit on a 4 layer PCB. The sensor gives output from 0.5V to 4.5V and has frequency response of 19 Hz ...
-1
votes
1answer
58 views

How was saturation current found? Was it assumed in this question?

I'm just a really confused about how Saturation current, Is, was either solved/derived or assumed?? Please see images of question and solution. The question requires that you find all the bias ...
-1
votes
1answer
126 views

ngspice MOSFET region of operation

how to find region of operation of MOSFET in a circuit in ngspice? or how do you know that a MOSFET is in saturation in a circuit in ngspice?
-1
votes
1answer
383 views

how does a Avalanche photo diode[APD] recovery time depend on TIA

in one my of low light pulse detection project i want to sense a very low light of 1mW/m2 so for this kind of scenario an APD is a device with its internal gain can give me abundant current to detect ...
-2
votes
1answer
651 views

got a too low VCE on a Infrared Phototransistor

I used an Infrared Light Emitting Diode QED123(VF=1.7V) and an Infrared Phototransistor QSD123 in pair. I learnt from QSD123's datasheet that its VCE(SAT) under IC=0.5mA is 0.4V max. But the VCE I ...
-2
votes
1answer
78 views

Horowitz lab 4.4

I have a problem doing lab 4.4 from Horowitz's student manual for the Art of Electronics. Here's the circuit and here's what I get from LTspice simulation, which corresponds to hardware circuit ...