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What is the quiescent current in a current limiting voltage regulator circuit?

Is the quiescent current simply the current drawn by Q1 and Rin when no load is connected to the output? How would this differ from the supply current?
user998479's user avatar
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Can I calculate beta by using the quiescent point and a voltage divider?

How can I calculate beta with only the data in the image? Q is the quiescent point. I've tried with the basics Vcc formulas, but since it doesn't provide any value for Vcc I could not proceed.
Enzo's user avatar
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Low-power high-range current monitoring

I'm working on a power circuit for a device that is usually battery powered. Most of the time, the device is sleeping and sipping at power around ~5uA, which is great for battery life. In this state, ...
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1 answer
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LDO - Need more current: build a discrete regulator?

I'm working on a battery-powered device using an ESP32. It needs 3.3v, and my battery is Li-Ion, so I've got 4.2-3.5ish (of useful voltage, anyway) - so max dropout has to be around 200mV. Most of ...
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UPS for battery with minimum quiescent current

I am powering a PIR sensor which has minimum 3.4V of VCC and 70µA supply current with parallel Li-ion batteries and I want to switch on a boost converter when battery voltage goes below 3.5V. But the ...
CaveScientist's user avatar
2 votes
2 answers
283 views

Low quiescent current boost converter for battery application (Io < 200 μA)

I am designing a PIR sensor alarm. It must be able to run on batteries for about a year. I am using 3.7 V Li-ion batteries to power an ATtiny24 directly. Although my PIR senor needs 5 V as recommended,...
CaveScientist's user avatar
1 vote
2 answers
221 views

How to control/remove "quiescent current" of UniversalOpamp2

In the circuit below, I get a quiescent current (entering positive supply and leaving negative supply of the op amp) of about 497 µA, while the load current is only 5 µA. I am aware that this ...
tobalt's user avatar
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2 votes
3 answers
704 views

Reducing quiescent current of MOSFET pullup/pulldown

I have a device which will run off a 2.7-60V power source. The voltage may go up to 80V during surges. I have a couple of input protection circuits which use N or P channel MOSFETs and require pullups ...
Michael Lawton's user avatar
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0 answers
440 views

Meaning of Input Leakage Current vs Shutdown Current and Quiescent Current

I am looking at an IC load switch that has values for Quiescent Current, Shutdown Current, and Leakage Current. My understanding is that Quiescent Current is current drawn by the IC in the "on&...
rfii's user avatar
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0 answers
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MMA8452 high quiescent current consumption

I have designed a PCB where I am using the MMA8452Q accelerometer. Because it is a battery powered device, we want to ensure that we are using the lowest sleep current states of all the components on ...
soumya panda's user avatar
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109 views

Output Stage Stability

I've been reading over amplifier output stage design and hoped someone might be able to advise if my circuit has any fundamental flaws - or if there are any tweaks I should make that would bring ...
Cdevelop's user avatar
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1 answer
2k views

Supply current vs quiescent current

I'm currently making a power/current consumption budget. Is there a difference between the quiescent current and supply current? I know the quiescent current is the current that when there is no load ...
kurcio's user avatar
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1 answer
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quiescent current opamp and R feedback

I have an opamp and would like to keep it in class A output. The rule of thumb is 1/2 of quiescent current should not be taken by the load. (to keep it in class A) The load itself is a R feedback (...
Johan B.'s user avatar
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2 answers
4k views

What does quiescent power mean and how I can find how much current the chip consume

I was checking this datasheet about a multiplexer. It says: This device handles rail-to-rail analog signals and consumes less than 4μW of quiescent power. Checking the tables below it says that ...
NicoCaldo's user avatar
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4 answers
346 views

Small Signal quantities

Behzad Razavi in his book mentions It is important to bear in mind that small signal analysis deals with only (small) changes in voltages and currents around their quiescent values.... If the ...
nn08's user avatar
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4 votes
2 answers
2k views

Transistor design with beta variation

I am studying Schilling-Belove Electronic Circuits, 3rd Ed. where in its second chapter under the "Maximum Symmetrical Swing" section it gives an example where the base current is kept constant and ...
nn08's user avatar
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1 answer
2k views

Quiescent current vs GND pin current for Linear Regulator IC power dissipation

I want to confirm that, for a linear regulator IC, quiescent current multiplied by the input voltage accounts for the IC power dissipation(including drop-out voltage loss). I ask because the ...
Dorian Ozoude's user avatar
1 vote
2 answers
1k views

Biasing a second stage amplifier

I built a two-stage amplifier as shown below. I have already built the first satge (R1-R5 & C1-C2) such that If I apply a signal of 1volts peak-peak, the output (at collector of Q1) would be 8 ...
William's user avatar
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3 votes
1 answer
2k views

2N2222 transistor datasheet saturation current

I am designing a 2N2222 transistor common emitter voltage-divider amplifier. Using 9V for the power supply and trying to make the loadline to determine Q. How do I determine the sauration point ...
SamR's user avatar
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1 answer
3k views

How do you measure quiescent current? [closed]

How do you measure quiescent current? (For instance, a Battery connected device)
Roo's user avatar
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2 answers
852 views

How can I set the quiescent current for a grounded-emitter amplifier?

I'm currently learning about common-emitter amplifiers in AoE3. I learned how to set the quiescent current for an emitter-degenerated amplifier. I simply choose \$V_E\$ and \$R_E\$ such that \$I_E = ...
Aust's user avatar
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0 answers
106 views

Does DC quiescent current vary with the load applied in an amplifier?

can you please clarify why the DC quiescent current in an opamp should decrease with load applied? Is it just a Spice model semplification or is there intrinsic cause? To me the DC quiescent current ...
Gianluca G's user avatar
1 vote
1 answer
2k views

Calculate the total max power dissipation in CLASS AB push pull for reactive loads

As worst case we can assume in reactive load the same power dissipation with the resistive part of that load. Thus for a 8 ohm impedance with phase angle of 60°, we can use \$R_L=0.5*R_{Reactive}=4\...
Gianluca G's user avatar
0 votes
1 answer
504 views

JFET Q-point for use it as resistor

I'm trying to use JFET as resistor. For use it as a resistor DS voltage need to be less than Vp. Vp from datasheet of 2n4391 is equal to -VgsOff and equal to 4.0V. How I can to set scheme to view ...
MaxMil's user avatar
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1 vote
1 answer
606 views

Synchronous buck converter in parallel with linear regulator

I'm looking at designing a circuit to provide power to a USB charging port (500 mA charge rate max) in a 12V battery-powered application. I'd like the buck converter to be "off" when there isn't any ...
macdonaldtomw's user avatar
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0 answers
180 views

problem with a circuit with one JFET

The circuit is a common source amplifier that uses the 2N3819. It is known that \$V_{DD} = 20\,V\$ and that \$R_g = 100 \,Ω\$ (the generator resistance \$V_g\$ applied in In). The entrance and exit ...
Carmen González's user avatar
-4 votes
2 answers
543 views

What is the quiescent current of P2N2222A [closed]

I wanna know the quiescent current of transistor P2N2222A. Datasheet for P2N2222A
JW_'s user avatar
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8 votes
2 answers
9k views

Replace AMS1117 5V-3.3V LDO on NodeMCU for LiPo with low quiescent current

I want use my NodeMCU to drive a SIM808 Module with integrated LiPo Charger. https://www.itead.cc/wiki/SIM808_GSM/GPRS/GPS_Module There are two problems. First of all the SIM808 Module just provides ...
Schr0nk's user avatar
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2 votes
3 answers
1k views

Why change the quiescent current in an op-amp? (LM4250)

I am trying to understand the LM4250 op-amp. Datasheet: http://www.ti.com/lit/ds/symlink/lm4250.pdf Main description: Pin-outs for DIP: Example circuit: It appears that pin 8 (quiescent current ...
Nick Gammon's user avatar
0 votes
3 answers
193 views

Ripple flowing through probes connected to the same point!

While trying to filter the ripple of my switching PSU, I've come to a phenomenon that is probably well known to professionals, but seems absurd to me. Admittedly, my scope is not of the highest ...
MikeTeX's user avatar
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2 votes
1 answer
3k views

Measuring quiescent current of a voltage regulator

I purchased 10PCS Socket Adapter plate Board For NRF24L01+ Wireless Transceive​ module and would like to know how much current/power it will draw as I want to run a project on batteries. A close-up ...
Paul Grime's user avatar
0 votes
1 answer
37 views

inQuiescent Current with Downsteam Devices

I have a circuit with a regulator (TI TPS61098 datasheet) with 300nA Ultra-Low Iq in "low power mode". What is the total current draw if I have other downstream devices with leakage current ...
EasyOhm's user avatar
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