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Measure Differential Voltage Gain

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Dear all, I know I could use Network analyzer to measure power gain (S21) of the LNA. If I want to measure the voltage gain of the LNA, how could I do it? Actually, I am using AC analysis in the simulation to see the voltage gain of the LNA. Is it correct? (...)
Why do you want two opposite signals at both inputs at the same time? This is not the normal working condition of a differential stage. The classical measurement is with one of the inputs grounded (assuming split supply with proper biasing for 0 volts at both inputs).
I want to measure the open-loop voltage gain of OP37 with Pspice.... I found that the open-loop voltage gain of OP37 is about 50db,the result is absolutely wrong!!!! But i don't know where i made mistake??? So,how to measure the open-loop gain of a op?? How to get (...)
Mishu, If the input of the panel meter is always exactly 1V (i.e. it's constant), - Nick That was an example... i mean if it is 10mV, it have to be amplified to exact 1V. Thus if 20mV, then 2V. Actuallyi will measure small differential voltage across a shunt. (mostly for current sense...) To FVM=> The TI INA128 may no
hello sir, i want to make a circuit that measure negative voltage of battery.i am using pic adc to measure this voltage, but does not read negative voltage. so i have convert this negative to positive voltage. problems 1. i don't have negative voltage on the system,to (...)
You forgot to translate the word "gain" into your own language. English dictionaries define gain as "the ratio of the signal output of a system to the signal input of the same system". Why didn't you look it up? We think you want to measure the voltage gain but instead maybe the current (...)
The two measures should match. Check balun parameters. For example, if your DUT has single end impedances equal to 50 ohm, you should use a single to differential balun with 1:2 impedance ratio (if you're using ADS take care that the T parameter means turn ratio and not impedance ratio, being Zratio=sqrt(Tratio)), DUT and balun 2:1 impedance ratio
Hi, guys, What is the highest voltage gain of LNA (single stage, either single-ended or differential) you found in all of the top publications? Of couse it should also demostrate ellegant NF. Thanks.
Hi I hope every body are ok , well , how we determine the small-signal voltage gain (Av) of diff. ampl. by sim. ? (using sim. , what method should be followed? ) thankx
Because it is the power signal to noise ratio that determines performance. Also power is easier to measure than voltage at these frequencies.
So if i have differential input voltage vi and -vi, does the differential voltage mean 2vi and the differential voltage amplide is mag(2vi)?
I think you are more confused than that. You should realize that there is a big difference between dBm and dB. dBm is a power ratio. Specifically, it is the ratio of a power measured at a certain point (like the output of an amplifier), to 1 milliwatt. In other words, if you had 105 milliwatts at an amplifier output, the power could also
HI Attached picture is the circuit of a rail to rail differential input stage followed by a Class AB floating bias circuit. Anyone has the concept how to analyze and design the voltage gain of the point A and B, could you give some advice? Appreciate you help, thanks! best
Hi All, I need to measure the Relative Humidity from a humidity sensor with a microcontroller. Problem is the sensor need to apply a ac 1V rms max and then measure the impedance, how to measure the voltage accurately? voltage too small and can't rectify with a diode!!?? The sensor is non-linear, any (...)
Hey, As v all know, Opamp has higher voltage gain than that of a transistor.. What makes the op amp to get this feature, though OpAmp is made upof many transistors???
voltage always depends on resistance and it is not easy to measure resistance on high frequencies. Power does not depends on resistance and therefore, it is more convenient parameter for RF and microwave technology.
Hi, I am uploading the picture of a differential differences (DDA) common mode feedback circuit.Does anybody know the equation that gives the dc gain of this topology.I have gone through google and known analog design books and papers but i can't find it...I would appreciate any helpful answer.Thanks in advance.
Dear Osawa Odessa: In an earlier reply others and myself tried to explain that all RF amplifiers amplify RF power, and you can measure the voltage across a typical source/load impedance like 50 Ohms. If you need to load your amplifier otherwise to get a higher or lower voltage, you can use RF transformers. I can see many your questions on (...)
Hi Can anyone help me how to measure close loop gain of the op amp in the picture in hspice simulation.
First you have to measure ESR on C3 to confirm suspicion.
1. voltage dividing network to reduce the peak to peak amplitude of 5 V 2. Add a DC offset of 2.5 VDC 3. The voltage swing will be from 0 V ( -220 V) to + 5V ( + 220 V) 4. Sample 2048 samples at Nyquist frequency (double the maximum frequency of the measured signal) 5. Use a RMS algorithm to calculate the RMS value OR use and RMS (...)
hia frnzs me wanting to design a circuit to measure the voltage of the signal having following specification: voltage range : 0-9.99v frequency : 1khz/10khz/100khz/500khz and display it on lcd screen.please help me out for how to mesure the voltage of this signal. waiting for response thankx shaz
can i measure AC voltage with a mcu with only resistance?
Can somebody help me in how to measure AC voltage using ADC. Ivould like to measure the AC voltage and send the result to uController.
Hi, I hope every body are ok , well I want to get small-signal simulation voltage gain . So how we get it , is it by input AC voltage source (ampl=1 and phase=0) to my ckt and make AC sweep sim. ( set suitable freq. range ) then run the sim. and take the output voltage form ckt output. i hope i explaine it clearly thankx
Hello experts, Could you give some hints on how to use MCU on-chip ADC to measure negtive voltage? In fact, I want to use ADC to monitor the negtive power rail output. Thanks.
Any ideas on how to solve this question? should gain with feedback be used: A/ 1+AB Need a little help. A large quantity of cheap amplifiers are manufactured but they have a wide variation in voltage gain - anything from 500 to 5000. It is proposed to appy the same negative feedback to each amplifier in an attempt to ensure taht (...)
Hi all As you know the voltage gain of a "common-drain" (source follower) cmos circuit is always less that 1. in deep submicron, it is near 0.95 (Lmin) even with an ideal current source at the source terminal. Is there any way to get a gain near one (0.999) without increasing L?
Hello, is it possible to measure ac voltage and current using the usual optocoupler like 4N35??
Guys, I need to convert a digital differential voltage signal into a unipolar signal suitable for driving an optical transmitter connected with a fiber link. Input voltage signal is that of DVI output with 3.3 V DC offset, and +/-400mV single-sided swing,operating at 1.65 Gbps. So what kind of should I use to do this?
i need to measure ac current and voltage by microcontroller PIC16f877 (A/D) but this A/D can measure until 5v so i need circuit to make scale between 5 v and 24 v and thanks alot
we all know two stages OP AC gain= gm x ro but if we design a one stage OP which only has gm, how do we get the AC voltage gain ? and how to increase the gain?
I have an ADC LTC2410. How can it measure negative voltage with respect to ground, but not IN-? IN- will be grounded in measuring. Thanks.
hi daviddlc, Shunt resistors have very small resistance and usually can have great current. One of problems with resistor solution is that all pcb will be on mains voltage, which I want to avoid. Some isolation is neccessery, and with isolation some voltage level transformer. I have idea to use transformer 220VAC/12VAC (or similar) and
Dear all, I have a Rx chain (included LNA+mix1+mix2) + baseband filter and VGA. I have combined all together and run the PSS + PXF in order to get the overall voltage gain. However, the simulation result is strange to me. It gives the M-shape voltgae gain and the voltage different is 10dB. However, the (...)
What is the measure for voltage & current coming from a 110 or 220 main line, is it rms or the peak value?
Hi can I measure negative voltage(-5v to 5v) with ADC804 and HOW ? if it doesnt possible please tell me about some 8bit ADC to do that by Regards.
If we need to measure AC voltage of around 50V to 500V, do we sure need a precision rectifier With regards, Garg
Hi everyone. I was told that the voltage gain of this Multistage Amplifier circuit (with negative feedback) is Rc/Re. But can somebody tell me how to derive this expression?
S21 is similar to a voltage gain. Technically, it is the ratio of transmitted/incident "wave amplitudes". Since on a transmission line, you can have forward and reverse travelling "wave amplitudes", you can not simply call them "voltages" since you can not measure them at a point with something like a pyhsical (...)
Hi,i am trying to find the voltage gain of the topology presented in the following picture.I realize that this is a current mirror and i want to use it as a non inverting stage (as we can see the series connection of two inverting amplifiers) to an opamp design.I have searced all over the known bibliography but i cannot find an equation for the vol
Hi, all. I am now designing the RF front-end for 2.4ghz band, including a LNA and IQ mixers. By using gm-constant biasing for LNA and mixers, there is still about ?1.5 dB variation in voltage gain over -45~85 ° temp variation in a given process corner, and can be up to about ?3dB gain variation for fast-best, typical and slow-worst corners. (...)
Hi, all. I am now designing the RF front-end for 2.4ghz band, including a LNA and IQ mixers. By using gm-constant biasing for LNA and mixers, there is still about ?1.5 dB variation in voltage gain over -45~85 ° temp variation in a given process corner, and can be up to about ?3dB gain variation for fast-best, typical and slow-worst (...)
Hello, If you can live with defining the voltage gain based on the maximum available generator power, you can ignore input reflection from the mixer. Maximum available power conditions means that the RF source is terminated with its own impedance to get maximum power transfer. In that case the actual voltage at the source's terminals (...)
The specifications of a differential voltage probe is given in the attached image. I'm confused with some of the specifications. Kindly advise the following: What does "Common Mode voltage DC + pk AC: 6500V" mean? I'm interested to learn how can we achieve such design (e.g. 6500V, DC-50MHz). I found several difference amplifiers, e.g. I
in given fig. each network have voltage gain 1/2 then voltage gain of cascaded is (a)1/4 (b) 1/5 (c)1/6 (d)1 select correct option. answer provided is 1/5 ,any one can explain how 1/5 is correct
As we know, constant power gain circles, constant noise figure circles, and constant efficiency circles are usually used to design an amplifier when we need to tradeoff among those performance. How to plot constant current (or voltage) gain circles ? Because I want to design the input and output matching circuits to get the maximum current (...)
Hi, I'm designing class c Power amplifier.I'm getting 90% efficiency. I'm not able to get voltage gain(gain<1) but I'm getting power it ok not to consider voltage gain while designing Power amplifier?.
Hi, What should be the minimum voltage gain in a class C power it ok if the voltage gain is less than 0.5 in PA and still hyave the efficiency greater than 70%:?:
You can convert AC to DC. After that you can measure DC voltage. I'm sorry , I don't know how to measuring current. u say right , but main problem is here when we use it technique with AC current measuring , it dc o\p is non liner . like measure AC voltage & convert AC to DC.