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Technical Discussions
Steven Younge
Steven Younge
02:08 Apr-03-2003
Ultrasound Imaging system Pulser & RF power amplifier

Hi, Everyone:

I am a student. While I read ultrasound articles I was confused by several terms as below:

Transmitter; (RF) Power amplifier (for example, class E power amp); Pulser.

I understood maybe transmitter means Pulser or (RF) Power amplifier, but what is different between Pulser and RF Power amplifier used in ultrasound transmitter? Is RF Power amplifier a part of Pulser or vice versa in ultrasound transmitter? When designing ultrasound transmitter hardware, whether or not transmitter should have separate Pulser and RF Power amplifier?

I knew Puler could produce spike (needle pulse), or short square wave; RF power amplifier amplifies tone burst, sine wave, or other wave that produced by DDS (direct digital synthesizer) or AWG (arbitrary wave generator)for driving transducer.

Could somebody help me?

Thanks in advance,

Steven

My e-mail address is as follow:

rfchip5@yahoo.ca




 
 Reply 
 
Joe Buckley, Sonatest PLc
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 524

Joe Buckley, Sonatest PLc

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
524
03:38 Apr-03-2003
Re: Ultrasound Imaging system Pulser & RF power amplifier
Your Understanding is spot on. I have only heard an RF Power amp being mentioned in Ultrasonics in relation to tone-burst or arbitrary waveform transducer energisation. Even then it will often be described ( and I plead guilty myself!) as a 'tone burst pulser'

Joe


: Hi, Everyone:
.
: I am a student. While I read ultrasound articles I was confused by several terms as below:
.
: Transmitter; (RF) Power amplifier (for example, class E power amp); Pulser.
.
: I understood maybe transmitter means Pulser or (RF) Power amplifier, but what is different between Pulser and RF Power amplifier used in ultrasound transmitter? Is RF Power amplifier a part of Pulser or vice versa in ultrasound transmitter? When designing ultrasound transmitter hardware, whether or not transmitter should have separate Pulser and RF Power amplifier?
.
: I knew Puler could produce spike (needle pulse), or short square wave; RF power amplifier amplifies tone burst, sine wave, or other wave that produced by DDS (direct digital synthesizer) or AWG (arbitrary wave generator)for driving transducer.
.
: Could somebody help me?
.
: Thanks in advance,
.
: Steven
.
: My e-mail address is as follow:
.
: rfchip5@yahoo.ca
.



 
 Reply 
 
Joerg Schulze-Clewing
Joerg Schulze-Clewing
00:32 Apr-04-2003
Re: Ultrasound Imaging system Pulser & RF power amplifier
Steve, just adding to Joe's comments:

A pulser is usually a transistor stage that switches a
high voltage to make a single pulse or a whole train of
pulses. It can be seen as a "digital" circuit or in the
language of RF engineers a class C circuit.

Amplifiers are usually linear, so they follow the amplitude
of the input signal. Most of those are operating in a
push-pull configuration and the way they are biased is
often leading to the description class AB. Very similar
to the way the final amp in a stereo works, except that
you'll see very expensive transistors in there and a
few toroid transformers.

All the best, Joerg.

: Hi, Everyone:
.
: I am a student. While I read ultrasound articles I was confused by several terms as below:
.
: Transmitter; (RF) Power amplifier (for example, class E power amp); Pulser.
.
: I understood maybe transmitter means Pulser or (RF) Power amplifier, but what is different between Pulser and RF Power amplifier used in ultrasound transmitter? Is RF Power amplifier a part of Pulser or vice versa in ultrasound transmitter? When designing ultrasound transmitter hardware, whether or not transmitter should have separate Pulser and RF Power amplifier?
.
: I knew Puler could produce spike (needle pulse), or short square wave; RF power amplifier amplifies tone burst, sine wave, or other wave that produced by DDS (direct digital synthesizer) or AWG (arbitrary wave generator)for driving transducer.
.
: Could somebody help me?
.
: Thanks in advance,
.
: Steven
.
: My e-mail address is as follow:
.
: rfchip5@yahoo.ca
.



 
 Reply 
 
jakjoud
jakjoud
02:13 Mar-23-2005
articles
Hi everyone,
I'm a student in second year of master, I'm interesting on measure using the ultrasound technics, and I'm searching some articles about this stuff;
could you help me please?


 
 Reply 
 

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