Questions tagged [quiescent]

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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 ...
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2 votes
3 answers
303 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 ...
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142 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&...
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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 ...
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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 ...
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1 answer
756 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 ...
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1 answer
36 views

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 (...
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2 answers
3k 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 ...
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  • 211
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4 answers
156 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 ...
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  • 186
4 votes
2 answers
914 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 ...
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1 answer
991 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 ...
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1 vote
2 answers
960 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 ...
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3 votes
1 answer
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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 ...
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1 answer
2k views

How do you measure quiescent current? [closed]

How do you measure quiescent current? (For instance, a Battery connected device)
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  • 521
0 votes
2 answers
694 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 = ...
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  • 351
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0 answers
95 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 ...
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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\...
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0 votes
1 answer
371 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 ...
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1 vote
1 answer
484 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 ...
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0 votes
0 answers
164 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 ...
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-5 votes
2 answers
407 views

What is the quiescent current of P2N2222A [closed]

I wanna know the quiescent current of transistor P2N2222A. Datasheet for P2N2222A
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6 votes
2 answers
8k 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 ...
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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 ...
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0 votes
3 answers
166 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 ...
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  • 1,706
2 votes
1 answer
2k 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 ...
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0 votes
1 answer
35 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 ...
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