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44 Threads found on Amplifier Using Mosfet
I want to build a class D amplifier which is supplied by 100Vdc single supply and another 12V supply. I've tested this output stage in Multisim but there is cross conduction. Mine input signal is 0V-12V 75khz. Help me to design an output stage without cross conduction, mosfet driver IC and without dual
Hello ! I am trying to design a power amplifier, I have a initial design aproach equations but this are for BJT, I am using mosfet and my doubt is for calculate the number of fingers I found these equation M=Idc/(Jemax*Ae device) (this equation is for bjt because is using Area of emitter) my question is what will be the (...)
Hi Everyone, am designing a class A power amplifier using a mosfet at high frequencies 100 MHz - 300 MHz and I just want to pass 100 mA current in the load. But I am facing some problems regarding: 1. The mosfet choice, thermal management is a problem; 2. I am using the LM324 for adjusting the drive (...)
In case where no volume control is required it can be done by connecting Gate of mosfet to PWM o/p pin through resistor, Source to speaker and Drain to Vcc. Really? Looks like a very limited audio DAC and amplifier design. Does your speaker tolerate DC current? Which pwm frequency? How many bits resolution? You can of course cont
Hi, How can I plot gain(Av) VS Id in a CS amplifier ? Thanks
To analyze circuit stability, you need to know the mosfet capacitances. I assume a TL082 in inverting amplifier configuration isn't stable with MOhm range feedback resistors due to the input capcitance generated pole.
hey guys, what are some advantages and disadvantages of drain extended mosfet over standard low voltage mosfets? assuming I am using these for a common drain amplifier for both high and low voltages? does drain extended mosfet have body effect? thanks!
HI; I should simulate class E using simulink/Matlab but the matter that i don't found the model of mosfet class E(CMOS) in the library .Please help me to found the model of the power amplifier CMOS class E. I'm so gratefull and thank you.
I am designing a circuit to switch a mosfet to power an audio amplifier at about 30 Watts, using a hall effect switch to gate the mosfet. Power will be a 26V 700 mAhr LiFePO4 battery pack, which I want to conserve as much as possible. I only occasionally need to switch the device on - it will sit for a few days or weeks in (...)
which gm rule can I use in design of simple mosfet amplifier circuit ? after designing such circuit and thus obtaining values of Id , W/l and Vod , should three rules of gm be equal or not ? gm rules I mean: gm=Un*Cox*W/l*Vod gm=2Id/Vod gm=sqrt(2Id*Un*Cox*W/l)
Hi, I am designing a two stage differential amplifier with gain 25dB. The input supply of the circuit is 1.1 v, my power consumption can be a maximum of 15uA, and my operating frequency is 5Mhz. I have designed the circuit but my circuit is working well at tt, ff and ss corners, But its failing at fs and sf corners. Can anyone over here point me
You didn't tell, but apparently you want to measure the motor current. Usually an isolated current sensor (hall effect or shunt with isolation amplifier) is the best way to measure it.
Dear all this is a similified schematic,so does somebody know why the red waveform will become low(lower than -15v, using a -17v power) when the input AC voltage is positive?I mean the input amplitude is only 0.2v,the mosfet M4 should be always on in my opinion. 9183991840 also I changed the input
I'm using IRF610 mosfet to build a common source amplifier. The mosfet is n-channel enhancement mode. I have read everything I could find on mosfets, read my lectures and still I don't understand how to do this. This is the best schematic I could find but I have no idea how to choose m
Hi everyone, im using orcad 16.3 to simulate class d power amplifier and i want to calculate the dissipated power in each element to evaluate the performance .. if there are any tools in orcad 16.3 to calculate dissipated power in mosfet transistor and the output resistance (50 ohm) please help thank you for help
why are we bias mosfet amplifier in the saturation region?
I want to design a cascade amplifier with differential input using mosfet with gain>3000 pls help
hi, i am unable to find the AC macromodel for a mosfet and an amplifier.This is my first post on EDA please help me. a) Draw the AC Marcomodel for the Transistor and The Amp b) Create a high level block for the Macromodel c) using the parameter obtained above, simulate the AC macromodel These are the questions that are exactly asked (...)
These are out of band oscillations. You are probably using mosfet devices. These show very high power gain at low frequencies, so relative small feedback (within a stage or across stages) may provoke oscillation (and destroy your active devices). Probably the load and source impedance as seen by the active devices are such that oscillation can occ
Hi, I'm working on a 13.56 MHz class E amplifier project. I'm using a EL7158 mosfet driver and IRF610 mosfet as a switch. To test the EL7158 driver, I first placed a capacitor of 900pF (in the range of the total gate capacitance of the IRF610 switch) at the output, to see if it can charge and discharge the cap fast (...)
Hi, all, For a simple differential amplifier, with resistor load or diode-connected mosfet load, how to enhance the operation frequency to, for example, 3GHz. I am using a 0.35um BiCMOS process, and I found that it's a little bit difficult to make this possible, so could anybody tell me is there any way to make it? Any circuit (...)
I want to design and implement a class-e power amplifier using discrete elements. can anyone help me to find a n-channel mosfet with low Ron (around 100mohms), brakdown dvoltage of 20-30volte and crr (Cgd) of 1pf to operate in 200-250MHz with low input power. Thank you for your favor in advance.
i am doing a project on class d this i am using four nmosfets for h bridge. i am using sine wave 20hz-60hz with triangular wave 400-800hz to generate pwm which is used for gating signal of mosfet. mosfet drain is conecting to 28v dc. i need to get 28v pwm with sine wave freq and shape.but
At 200 MHz, the power amplifier operation should be better understood as class-C rather than rectangular switching. The latter won't be achieved anyway.
To get 500W (60dBm) from a 2W (33dBm) input, requires a lot of gain, which is unusual for a single stage power amplifier (even there are a lot of transistors in parallel). Most probably your circuit oscillates.
Sinusoidal? You mean to drive the mosfets 'analog' like in an audio amplifier? Normally the 2 N-ch mosfets are connected to ground with the sources. The centertap is connected to the positive supply. Each mosfet willl pull the transformer winding to ground one by one.
If Vsource = 3 + 0.1sin(1000t)V and Vout = -2sin(1000t) Gain would be Av = -20, correct? It would not be correct to divide -2/(3 + 0.1), but -2/0.1. How would one remove offset from the input signal when designing a mosfet transistor amplifier using only 1 transistor? -Thank you Added after 1 hours 1 minutes:[/col
Hi; I am new to design of amplifiers using mosfets. I plan to design a High Gain amplifier for a wideband. I am using Pspice for the simulation. Please provide any tutorials, design rules, Pspice Tutorials that can help me. Also, I need some material on using Pspice for analyzing (...)
I want to design 40Mhz linear power amp(power gain > 20dB) using Agilent ADS in PCB board. I am looking for bipolar transistor or mosfet transistor which has ADS library My questions are 1. What kind of standard or condtion do I choose right component ? 2. Could you please recommend any discrete components in ADS library ? THANK YOU
Your mosfet doesn't have much voltage gain. Usually an opamp with an internal voltage gain of 200,000 is used as an error amplifier.
Hi, I am a novice in analog design. How do you bias a mosfet in saturation region using ADS software? I am trying to find the DC gain of a very simple single stage amplifier with a current source at the drain, but cannot bias the mosfet properly. Any help would be greatly appreciated. Thanks, KS
Sorry a mistake ... connect M3 as CS amplifier
Hi people, I'm trying to design a 1 Watt push pull amplifier using dual NPN RF mosfet at 40MHz and a 24 Volt single supply. I'm not using any inductors or transformers. I'm not sure how to bias the mosfet correctly. What type of biasing circuit should I be using ? Since I'm (...)
hai friends is it possible to make power amplifier using n channel power mosfets i m getting only circuits using n chanel and p channel
If for a Receiver square low detection made by mosfet at RF stage is preferred for lower distortion. Is transmitting using power mosfet is preferred as a power amplifier before the antenna or BJT is better.I mean what are the advntages and disadvantages of using either type.
I am designing an LDO to produce a regulated 1.8V from an unregulated 3V supply with 50 mA as max current. For this the W/L of the mosfet turns out to be around 2000. For compromising this making the transistor to go in linear region will reduce the W/L drastically to around 100 but increase the gain of the error amplifier. So which one is a bett
Does any body have a schematic of audio power amplifier that uses only IRFP250 or any other easily available N Channel mosfet. I have one that was published some times back in Elektor magazine but that has stability problems. Thank you
Hi, i am simulating this circuit using M*I*C*R*O*C*A*P VII and i am not getting any results. In my opinion it seems to work, but that's not what i am getting. I have to build a simple power amplifier to output AC current to a capacitive load, so i decided to use mosfet as output amplifiers (operating in class B). (...)
Hi I am designing a common source amplifier and I am using a POWER mosfet (2N7269). I am using a voltage divider biasing. My input is of 5Vpp (ac) and I require a tunable gain of 0 - 5. The circuit can be seen on: Well I have done the calculations and according to the requirements an
Hi, I'm in my 3rd year and was asked to build a project. I consulted some books and decided to go with a 40W audio amplifier (with an 8-ohm load). Submitted my proposal and everything, but it turned out that I'm to use mosfets in it, and play with its structural properties (in SPICE and LASI). The circuit that I had found to analyze and simulate
use the brige amplifier using IRFP250 mosfet for each bobin of stepper motor. this is the best way because you can use the pwm to control the speed of the motor. this circuit is called H-bridge.
Dear All I need an integrated HF ( UHF ) Power amplfier (about 2 watt) that match with 75ohm load . would you pls help me to find one or design one. Best.
Hi, I would like to design an HF power amplifier but all the schematics i have found are not in the desired bandwith !! SPecifications of the amplifier: Input signal : 0 to 12V between 800Khz and 5Mhz OUtput signal: 0 to 12V but 60W !!! I would like tu use a PUSH PULL configuration whith low cost mosfet (like IRF...). because (...)