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88 Threads found on edaboard.com: Push Pull Amplifier
BJT are fast if not driven into saturation. In addition MOSFET gate driver must provide low impedance push-pull operation, particularly fast gate discharge. That's impossible with your single transistor high side driver circuit. Just helpless.
1. That part is meant to be used in a push-pull configuration. 2. It's meant to be used in class AB or C, which means that small signal matching is not going to get you the optimal output power. 3. How did you choose your gate bias voltage? 4. Is this, by chance, for MRI applications? Fortunately the MRFE6VP61K25H is a popular part with the HAM r
Hi! I want to design a push-pull power amplifier in AB class. I tried to use the test circuit of the transistor in the datasheet to get some idea about designing. I'm using ADS and I draw the schematic of the test circuit.now I think I should run HB-simulation. But I couldn't manage to run that. but it couldn't be converged due to some (...)
A common drain Mosfet is a source-follower. It has no voltage gain and is extremely difficult to bias because if you make it push-pull the N-channel needs a fairly high input voltage and the P-channel needs a fairly low input voltage. A CD4007 or a CD4069 cannot be made to do what you want and if you use separate Mosfets it will be very difficult.
You need at least 3 transistors to make a push-pull amplifier, not just two transistors. The first transistor provides voltage gain and inverts so that negative feedback can be added. You need to learn about transistors to design a simple audio amplifier. Here is a simple transistor amplifier that uses (...)
It means that I should use mosfet push pull driver based on P and N channel transistors? Could you see link
hi everybody. my project use the push pull amplifier, working in 1-30MHz. I using ADS and had some FET model, but i can't know how to build transformer ferrite core model. 1.can you show me how to build it and the manufacturer ferrite core are often used?? 2. a my friend gives me a noname ferrite core,which is bought in china. i use (...)
I am trying to build a battery powered inverter that takes 13-17volts DC from a lithium battery and outputs 120V modified sine wave AC I tried building the Inverter using a SG3525 that is featured on Tahmid's blog here I am having alot of trouble getting it to work right, The outpu
hi we've designed a stabilizer for industrial purposes. the design details are these: the output voltage is 220V 50Hz. a microcontroller generates a sine wave. the sine wave applied to an op-amp amplifier and then a push pull amplifier. there is a feedback from the output of push pull to (...)
what are advantage and disadvantage, if we built push pull transformer couled amp with mosfet instead of bjt .
hello, I want to analysis the schematic of 100W_PEP linear amp in RD100HHF1 transistor application note (ANVHF027B.Pdf), here questions: 1- How I can estimate the gain of PA in large signal? 2- Why designer inserted a 56Ohms resistor in feedback and how calculate this? 3-The input impedance of the PA how was estimated? 4-With the 13.8 supply
hello, I would like to design a linear push pull class-AB 20W power amplifier in the HF band using similar RD16HHF Mitsubishi transistors. Here are the questions: 1- In this scenario, how much gain can I get from this push pull amplifier? 2- How I should calculate optimal values of the (...)
You didn't yet mention the top0logy of the intended two transistor class-A amplifier, e.g. transformer push-pull, half-bridge,...
A push-pull amplifier, even in bridge configuration would not generate 75V unless you used the -120V supply. Suggestion: Use a standard small mains transformer in reverse. For example, use a 115/12V transformer and drive its 15V side from an amplifier running from the 13.8V supply. To get 75V out you only need to drive it (...)
What's your load? What frequency? Some kind of push-pull circuit is what first springs to mind...
This is a good starting point: The circuit is very similar to yours but note that the first transistor gets it's bias from the output stage. For 12V I would re-introduce the emitter resistors (R2/R3) and increase the output capacitor to 220uF or even 470uF to get better frequency response. The
Most push pull class E topologies I've seen have the output L and C and load R all in series. But here Wong shows the load R across the filter capacitor of the output LC filter: Which way is better and why, with the R (output coupling transformer) in series or with the R across t
I have attached a picture of a folded cascode amplifier with class AB push pull stage. My question is regarding the SLEW time of the amplifier. During the 'internal slewing' when the compensation capacitors CM1, CM2 are being charged up, what is the status of the M4, M4C, M8A, M9A, M2C, M6 ? Do these mosfets operate in (...)
Since the two transistors in a push-pull amplifier are in series the current through both will be the same as long as the output is set to 0V output bias (or the output is capacitively coupled). The MOSFET resistance to current flow is determined by the gate to source bias voltage on each transistor.
Compared to single-ended PAs, a push-pull power amplifier has lower input/output isolation, and also about 4 times higher output impedance. All of these conduct to poor stability using conventional BALUNs. The PA it will work somehow without T2 and DC blocking caps (and feed the drains through T3), but will be hard to make it stable vs (...)
Your new waveform in post #6 is PWM. But your circuit will not work because it is a half-bridge that pulls down well but almost nothing pulls up the outputs. You need a full H-bridge that has push-pull on each output. You also need some "dead time" to allow an upper or lower half of the H-bridge to turn off before the other (...)
Hi... I want to design Class B push-pull power amplifier for RFID application with operating frequency at 13.56 MHz. I confuse about transistor should I used. Because my power amplifier is a push pull amplifier, it will need both npn and pnp transistor that must (...)
Hello, I need a cmos amplifier circuit with high SLEW rate. The load is a RC type with values 200 ohm and 2 nano F. Max load current is -10mA to +10mA Supply voltage VDD = 4.5V Any suggestions or any reference papers for reading ?
It's not a darlington amplifier. It's a push-pull output driver: In certain cases (eg when driving MOSFETs), it's referred to as totem-pole driver. Darlington transistor/pair: A simple Google search should clear your doubts on push-pull ou
Hi, I'm having trouble finding a suitable pair of transistors for my amplifier push pull output. They are being driven by an op amp output as part of a feedback loop so low source resistance making bjts best. They also need to be medium power as they supply 0.5W max each. My application operates from 10kHz to 1.5MHz, from a 12V rail. (...)
It is a tube amplifier push-pull in Ultra Linear system. It was modified ? there is additional tone adjustment system, described below:www
It is an acoustic tube amplifier based on popular and easily available tubes ECC83 and
Dear iVenky Hi i couldn't understand your exact problem . but let me describe some of the specifications of a push pull amplifier : it has two transistor . you are applying your input voltage across the BE with a transformer or a CE amp . with variation in base current , the collector current will have fast changes . and here you'll have (...)
Help, Need paper: "A Decade Bandwidth 90 W GaN HEMT push-pull Power amplifier for VHF / UHF Applications" Krishnamurthy, K.; Martin, J.; Aichele, D.; Runton, D.; Defense & Power Bus. Unit, RFMD, Charlotte, NC, USA thanks
2. A push-pull amplifier will cancel even harmonics but not odd. Frank
hiiii i m working on CLASS B push pull power amplifier frequency Range 402-405MHz , i have to design a power amplifier that can deliver 500uwatt power to 50 ohm load. the thing want to know is 1. when i m doing transient analysis and calculating power at 50 ohm load ,the power at load is settling after 25n sec . but i (...)
It is a car amplifier with a power of 400W. The device is based on the push-pull converter on system KA7500 (TL494) with a power of up to 500W, allowing four power amplifiers TDA7294. The amplifier has three 3-digit
Hi, I have a class AB push pull amplifier shown below. It has single ended input and single ended output. 1.How can I give a resistive feedback and use it. 2.How can i measure input common mode range and output common mode range? 3. How can I measure offset voltage? Is there any significannce of offset voltage in case of single (...)
They are used with CMOS transistors for low and moderate power levels. But at higher power levels, single ended and push-pull configurations are more convenient.
Touchstone Semiconductor has extended its free demo board program through Dec. 31, 2011. The company is offering free demo boards for their analog IC products, including the 0.8V, 0.6?A TS1001 operational amplifier, and the new push-pull TS9001-1 and open-drain TS9001-2 ultra low-power voltage monitor ICs, with +1.252V reference and a 1% (...)
Dear All thanks in advance for your help, I am new to R&D and have been given a design of 1.2kW Class B push-pull amplifier. now I understand the working concept of class B but what i am confused with is working of transformer at the out put. I don't understand how it is summing up the two outputs and why even harmonics are in phase and (...)
Hi Guys, Help. I need an push-pull AB type rf power amplifier tutorial with ADS. Please!
In a audio push-pull device : The only way i can see You can do this is by attaching a optocoubler at each amp, where the transistor part is the bias part and the led part goes to Your second supply. In a circuit with an ota amp or like (was it LM13081 ?) : set the transistor part of the opto between power 1 and the bias pin. If standard op
Unfortunately whatever topology is used, single amplifier, or parallel, or push-pull, the transistor(s) shall tolerate substantially increased over-voltage stress, as collector/drain voltage waveforms show much higher peaks under mismatch conditions than in nominal operation. There are some approaches that use VSWR protection by clamping (...)
Hello, I built a push-pull amp with transisters that have a Ic Max rating of 3A. They are operating at 1.1ARMS or less. They get pretty hot, but I was wondering if I should spend the money on heatsinks or just drill some holes in the top of the enclosure. They are the TIP31 and TIP42 that you get at radio shack. George Actually it would b
No, I think so, that it's not needed a third IF amp. stage, your first circuit should be work with 1.5 v. Set the transistor currents as in picture (with the basic resistors). Use Ge NPN transistors in the push-pull end-amplifier if needed due to the low voltage. The other circuit is interesting (mixing NPN and PNP) but not really su
Dear All, I am designing a push-pull regulator for digital circuits. The schematic is as attached. It consists of pre-amplifier followed by comparators (push and pull side) and finally switched source-follower output stage (push and pull side). I have verified that all (...)
BD135 is an audio dedicated transistor. It can give about 5W RF output power at 3MHz, but at 30MHz cannot get more than 100mW output power. You have to chose a different transistor, and recommended topology for a broadband PA in HF is push-pull using balun
i think he means a linear push pull 12v ...48v into 110\220v inverter......
Ok, I've a unique situation. I want to use a standard Single Ended stereo amplifier, but to eliminate the output caps, I want each of the L/R channel output 'ground connection' to be tied to a common 1/2 VCC voltage. Now I know that BTL amps essentially do this (eliminate the output cap), but I have a unique need - the output must be p
You can use dual op amp OPA2674 instead. push-pull configuration will give you up to 1W output power.
How to simulate RF push-pull amplifier in matlab-rftool/Simulink/Code. Anybody is having such simulations please share with me. Is there any book-matlab which supports above subjected simulations please provide me.
Dear All, I have to design a push-pull Source Follower Output Stage with 1.8 V - to -0 V supply rail. The input to this stage is from a two-stage differential amplifier's output. I have few question regarding this: 1. How should I initially DC bias the push and pull transistors? Does these transistors (...)
A single transistor means class A operation. If the load is resistive, the DC bias current causes a dissipation twice the signal power (assuming a sine signal). Is this what you intend? Otherwise, you should think about a push-pull amplifier.
hello, I need a schematic for a broadband amplifier covering the 1-30MHz range. Input about 50-100mW Output 1-2W or 1-10W Preferably a Class-A non-push pull design The attatched file is an example of exactly what I need. The problem is that the BLF175 contains toxic material and I do not like to use it. Is there any direct non-toxic (...)