# Questions tagged [saturation]

The tag has no usage guidance.

182 questions
Filter by
Sorted by
Tagged with
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 ...
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 ...
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 ...
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.
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....
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 ...
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 ...
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 ...
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 ...
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(...
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 ...
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 ...
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 '...
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?
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 ...
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 ...
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 (...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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?
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 ...
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 ...
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 ...
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?
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 ...