Simply the ratio of output signal to input signal, this dimensionless quantity is a measure of the amplification of a signal which may be represented by voltage, current of may even have a digital representation. A very general concept sometimes used to describe attenuation (when gain
-2
votes
1answer
78 views
what is the gain of this amplifier at resonance frequency?
I want to analyze this circuit but I do not know how to compute its gain at the resonance frequency.
In lab its gain at resonance frequency (910kHz) was 54.
4
votes
1answer
76 views
Least noisy pre-amplifier design
I am building a frequency generator circuit and need some advice. I am using the AD9833 DDS generator (programmed from a PIC16F876) to generate frequencies and I wish to be able to adjust the gain.
...
1
vote
2answers
106 views
Does gain affect stability of a Transfer Function?
I have a control system that we are working on with a forward transfer function of:-
\$ \dfrac{K(2s+3)}{s^2(s^4+2s^3+4s^2+2s+7)}\$
So I've set up the routh table for this, I've found there are 2 ...
4
votes
3answers
148 views
For what reason(s) is it not desirable to have the amplifier gain depend on the β of the transistor.
For what reason(s) is it not desirable to have the amplifier gain depend on the β of the transistor.
1
vote
1answer
131 views
Gain on a Differential Amplifier
For the past hour, I've been trying to calculate the gain of a differential amplifier in the following form:
\$ \frac{V_{out}}{V_{in}} = \$ some function of resistors
I went to this site and tried to ...
2
votes
3answers
269 views
How do I calculate the gain of an op-amp summing amplifier?
So if I have a summing amplifier circuit like the one below:
I know the Vin1, Vin2, and Vout value and the circuit is designed such that Vout = -(Vin1+2Vin2) but how do I calculate the gain? I know ...
1
vote
1answer
150 views
Small high gain directional antenna
I want to build a high gain directional antenna for the 915MHz frequency band.
I have been looking into waveguide and yagi antennas, which seems to fulfill my gain a directional requirements but ...
2
votes
1answer
50 views
Darlington (TIP110) gain value
I'm referencing this Fairchild semiconductor datasheet on the TIP112. (I'm actually working with a TIP110) and trying to evaluate the gain. In the specs grid on the second page, the sheet states -> ...
3
votes
2answers
355 views
adding a yagi antenna to a bluetooth dongle
I want to set up a Bluetooth link between devices that are over 2000 feet apart. Yagi antennas for 2.4GHz that can connect to routers are available. A cheap Bluetooth dongle that can be easily taken ...
2
votes
2answers
100 views
What's the use-case for gain selection on a DAC?
I'm looking at the datasheet for an MCP4921 12-bit DAC (PDF), which describes the following feature:
Selectable Unity or 2x Gain Output - The user can configure the full-scale range of the device ...
6
votes
1answer
296 views
Why is my instrumentation amplifier's gain non-linear?
I am using an AD8226 instrumentation amplifier as the pre-amp in a circuit which uses a micro fuel cell oxygen sensor to measure oxygen content in a gas stream. The pre-amp is configured in single ...
1
vote
3answers
148 views
What is “gain” a measurement of in electronics?
I'm familiar with the term "gain" used in sound and music, but I'm having difficulty finding the definition in electronics. I'm seeing the term low gain and high gain being used in the description of ...
1
vote
2answers
207 views
What potentiometer should I choose?
I want to create a sound amplifier with the LM386 and I need a potentiometer. I don't have a clue what I'm doing (:P) but I've printed out the datasheet (for the LM386) and had a look at it.
So I ...
2
votes
0answers
78 views
Digital automatic gain control? [duplicate]
Possible Duplicate:
Calculating dBFs from RSSI
My RF chip doesn't have any RSSI output, just ADC I and Q. I was wondering is it possible to determine RSSI from ADC's I and Q values and ...
1
vote
1answer
137 views
What does it mean for amplifiers to be stable only down to N gain, where N > unity?
This is related to
What's special about "unity-gain stable"?
which is about unity gain stability.
But what exactly does it mean if some op-amp is said to be only stable to, say, gain ...
0
votes
1answer
171 views
Creating a programmable gain amplifier with a digital pot and an op amp
I wanted to create a PGA using a single supply op amp and digital pot. I hooked up my circuit like below, but my signal is getting attenuated with Rwb = 200 ohm and Rf = 1k. Are there any problems ...
1
vote
4answers
227 views
Characterizing raw op amp gain
I thought as a first exercise in op amps, even before setting up a feedback circuit, I would determine the gain of the raw op amp.
I tried with an LM324 and an LM358 which should be essentially the ...
2
votes
1answer
252 views
Amplifying Signal From Electret Microphone
My project requires me to use an electret microphone and I am having a lot of trouble getting any decent-sized signal out of it. I currently have it configured with a 100Kohm pullup resistor and a ...
3
votes
3answers
162 views
Ground/short circuit confusion
I am reading the book Electronic Principles by Malvino and I found the circuit shown below.
It asks to find the A(gain) when the switch is in position 1 and in position 2.
I am not sure about this ...
1
vote
3answers
236 views
Analog Switch Breakdown voltage?
I'm designing a select-able gain circuit using a multiplexer and an inverting amplifier. Here's an example circuit, using a multiplexer.
I've read that if you provide a voltage larger than the ...
1
vote
2answers
368 views
Op-amp gain too big, can't figure out why
We are using a 741 opamp using an inverting input.
My students built a circuit, and the gain was way too high. They had taken it apart. So I had them build it in front of me. The gain is still too ...
-2
votes
1answer
170 views
OP AMP amplifier [closed]
I am building a simple op amp amplifier circuit using IC LF351. I m using this circuit at very low voltages about 100mV. however the gain does not remain the same at this voltage. Like the theoretical ...
0
votes
2answers
277 views
Is feedback transfer function the same as the transfer function for the whole circuit?
I have a circuit very similar to the inverting band pass filter circuit here:
I was asked a question about the circuit's feedback transfer function. Is this the same as the transfer function for the ...
-1
votes
1answer
164 views
Types of amplifier - what is the difference?
What is the difference between an open loop amplifier and a voltage follower (unity gain buffer)?
0
votes
2answers
402 views
Amplifying strain gauges on an arduino
I have 4 standard mild steel foil strain gauges bonded to a steel bar in a wheatstone bridge arrangement. They are implemented into a circuit with the INA 125P amplifier. I only manage to use about a ...
2
votes
1answer
244 views
OP07 unity gain
Is an OP07 unity gain stable ? I am powering it with a +/- 5V supply. I am using it to buffer a DC signal which varies slowly.
Most of the modern Op-amps have their datasheets mentioning them ...
3
votes
2answers
148 views
Is there an amplifier such that the gain is equal to the ratio of two potential differences?
I have been toying with some alternatives to transistors in building logic gates. I am particularly interested in the device I tried to summarize in the title of this post. The chip would have 8 pins:
...
-1
votes
1answer
634 views
amplifier gain theoretical vs experimental? [closed]
Why is it that the experimental gain of a discrete amplifier is greater than the theoretical gain? Is this a general and normal/expected result?
This is the result that I found when I measured the ...
2
votes
1answer
969 views
Intrinsic Gain vs. Voltage Gain
I was wondering what the difference is between intrinsic gain and just "normal" voltage gain of a circuit i.e Vout/Vin?
thanks
2
votes
7answers
959 views
Switching op-amp gain resistances - how?
Given the following circuit:
What is the component / circuit I should be using to switch the signal between each of the gain resistors? (the ⊠s in the schematic)
The inputs ID0 to ID2 are TTL ...
