All Questions
19
questions
0
votes
1
answer
126
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Looking for alternative analog/digital circuits to drive low impedance with high current
I am looking to drive a load with the specifications as follows:
Load Resistance = 2.2 ±0.3 Ω
Load Current = 1.5-4.5 A
Nominal Load Current = 2 A
The load current should never go below 1.25 A at any ...
- 41
0
votes
0
answers
63
views
Why does power driven to the load has this expression?
I'm designing an oscillator, I'm using as textbook Krauss one.
I would like to design the oscillator In function of the power it must give to the load and the fundamental frequency.
I have seen this ...
1
vote
0
answers
58
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How to connect a load to an amplifier without a loss in gain?
I have this circuit below, that represents a common emitter amplifier:
When connecting a load of 10 ohms to the collector node and a signal to the base node there is a huge loss in the gain of the ...
- 11
0
votes
3
answers
235
views
Distortion in output signal in amplifier after connecting load
I want to design an amplifier which works in 20kHz-100kHz range with 0.1V peak to peak signal.
This is my circuit.
It works fine in the simulation. It works fine without connecting R6 8 ohm load. But ...
- 11
1
vote
3
answers
1k
views
Cascaded BJT Amplifier Load
In my first layout, with a 9.2k load I get a gain of ~55 (20mVpp in -> ~ 1.1Vpp out).
My current understand is that if I replace the resistor load with something else that presents as 9.2k (i.e. ...
- 307
0
votes
1
answer
336
views
Power Contours for a Power Amplifier
I am having a bit of difficulty generating the power contours at a Pin where Pout is 17dBm. I am doing a PSS analysis in Cadence Virtuoso. I am sweeping the phase along with a parametric sweep of the ...
- 63
2
votes
1
answer
198
views
What is the purpose of this FET load?
I'm used to seeing a load resistor in the place of the yellow highlighted (Q2) section of this FET amplifier circuit.
This is the input section of a guitar overdrive effect, so any distortion created ...
- 31
0
votes
3
answers
879
views
Output voltage of an amplifier circuit
I found this note on a devicesheet:
I'm asking about the output current:
How can we fin Iload = Vout/(RS*R2/R1) ?
For our example, we will take Vcc = 3V, we call Va the node crossing R1 and RS wires....
- 311
1
vote
2
answers
448
views
Questions on load modulation, Doherty PA
I was unable to understand a bunch of stuff related to amplifiers. Specifically my questions are as follows:
What is load modulation? If i have a load of impedance of 10 ohms physically, then does ...
- 309
0
votes
0
answers
41
views
Load Resistance
Suppose we have this circuit (I do not include bias):
using this model:
What's the difference between having:
1) \$R = \frac {V_ {CC}} {I_C} \$
2) \$R = r_0\$
\$I_C\$ is the collector ...
user153389
1
vote
2
answers
238
views
Guitar amplifier into load box
I own a Peavey Valve King 100 Amplifier and would like to hook this up to my audio card's line-in without blowing stuff up, so I thought I should get a loadbox with a built-in speaker simulator. I ...
- 135
0
votes
2
answers
1k
views
What is the purpose of resistor Ra in this simple vaccum tube voltage amplifier circuit?
Came across this in a book, there's a brief explanation of why there's said resistor in the circuit:
" ... it should be obvious that if we apply an audio
signal voltage to the grid (i.e., vary the ...
- 175
1
vote
1
answer
817
views
Problems when loading an Ultrasonic transducer (reflected power)
I have a very simple setup that is giving me problems I cannot understand:
Apparently, the reflected power is the same as the power generated by the amplifier (both measured by the amplifier, ...
- 73
0
votes
1
answer
6k
views
Load cell amplifier circuit
I'm designing a circuit to take two load cells as inputs, and make their sum.
I'd like to know your opinion about the design.
Each cell is connected to one instrumentation amplifier (INA122P).
...
- 89
2
votes
1
answer
772
views
Differential amplifier with active load Sedra Smith
I'm studing differential amplifiers on Sedra Smith book, and I have come across the following circuit.
My question is: how can NMOS transistor \$Q_2\$ have a current \$g_{m2}\cdot v_{id}/2\$ if the ...
- 33