Project goal

To build a high frequency amplifier circuit board with specific input and output voltage and frequency requirements.
Scope of work

- Design a high frequency amplifier circuit board. - Circuit should accept inputs from 1-20 volts DC. - Support input frequencies from 0.5MHz to 6MHz. - Achieve an output voltage of 150 volts DC.

 

What is the output load? It makes a difference what the amplifier is driving.

 

its for an ultrasound head

 

What is the output load? It makes a difference what the amplifier is driving.

hi the unit is driving an ultrasound head, sending not receiving

 

What kind of power supply would this amplifier require?

 

What kind of power supply would this amplifier require?

i was hoping that would be part of the circuit

 

i was hoping that would be part of the circuit

Generally speaking, an amplifier is designed separately from the power supply for a variety of reasons. If you want both of them together, then you need to specify both of them. This is particularly true when you specify a high voltage output. In this way if you need a specific amount of output power the supply can be designed to provide it. Of course, this now becomes a more challenging design task.

 

Generally speaking, an amplifier is designed separately from the power supply for a variety of reasons. If you want both of them together, then you need to specify both of them. This is particularly true when you specify a high voltage output. In this way if you need a specific amount of output power the supply can be designed to provide it. Of course, this now becomes a more challenging design task.

hi the output needs to be 150 volts dc

 

hi the output needs to be 150 volts dc

An amplifier with an DC input of 1-20 Volts and a DC output of 150 V at 6 MHz does not make much sense. Do you mean that 150 volts is the maximum output voltage. You absolutely cannot have DC voltages in and out along with 6 MHz, or really any frequency other than zero, at the same time. It doesn't seem like you're too clear on the requirements. So, which is it?

 

Project goal


To build a high frequency amplifier circuit board with specific input and output voltage and frequency requirements.
Scope of work

- Design a high frequency amplifier circuit board. - Circuit should accept inputs from 1-20 volts DC. - Support input frequencies from 0.5MHz to 6MHz. - Achieve an output voltage of 150 volts DC.

sorry people i made a mistake here is the correct needs
Circuit should accept inputs from 1-20 volts AC. - Support input frequencies from 0.5MHz to 6MHz. - Achieve an output voltage of 150 volts AC. The power supply either external 36v dc or internal which is better in your experience ts to power an ultra sound head

 

An amplifier with an DC input of 1-20 Volts and a DC output of 150 V at 6 MHz does not make much sense. Do you mean that 150 volts is the maximum output voltage. You absolutely cannot have DC voltages in and out along with 6 MHz, or really any frequency other than zero, at the same time. It doesn't seem like you're too clear on the requirements. So, which is it?

hi Sorry i made a mistake here is the correct needs
Circuit should accept inputs from 1-20 volts AC. - Support input frequencies from 0.5MHz to 6MHz. - Achieve an output voltage of 150 volts AC. The power supply either external 36v dc or internal which is better in your experience ts to power an ultra sound head

 

So the output is 150VAC for a 1V input and 150VAC for a 20V input? And in to each of the following loads:

a. 1000Ω
b. 1Ω
c. 26pF || 157Ω
d. 1H in series with 3.5Ω
e. 5mH || 2uF series with 7Ω

Right?

 

Design a high frequency amplifier circuit board.

Oh never mind, I just reread the post. You are designing a circuit board for an amplifier, not the amplifier. So post the schematic and parts list.

 

Hi @altered
Is this project a College or Homework assignment?

Moderation.

 

Hi altered,
It is naive to believe that here on the forum will do your job for you.

 

It is difficult to imagine that an ultrasound system would have such a wide range of input amplitudes from the excitation section. And what sort of load will it be driving. And the ultrasound frequency spectrum does not go down into the audio range.
So please let us know just what the application is, because the description does not seem to match my understanding based on other information, which was not recent, I admit.

 

It appears there is a 36V supply. By using bridge amplifiers we can get about 60 volts peak to peak. (two 30V p-p amplifiers)
It will be hard to do 150V at 6mhz in a single amp. The volts/second is very high. It is hard to find high voltage parts. Years ago we worked on a 30V amplifier that used a transformer to get up to 150V.

chieve an output voltage of 150 volts

We need to be certain we are talking about the same thing. When measuring ac voltage, there are three different ways.
Vpp is peak to peak. Vpk is the 0 to peak, then there is average and Vrms which can be the same.

Where I live the power line is 120Vrms which is 170Vpk and 340Vp-p.

 

I'm guessing that a traditional Class C amplifier will be a sub optimal solution and so I'm about to look at Class D & E. Not too familiar with parts that work with those voltages in that frequency range. I hope you're not in a hurry.

 

Really, the required performance can be achieved by a pair of 6L6 power tetrode tubes. But it will be far from small or cheap, and it will require a more capable power supply.
I am not recommending that scheme, although it would easily meet the original specification.