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From: James Palmer on 6 Feb 2010 05:31
I am building a workbench function generator from an XR2206 chip.

Would anyone here have a tested circuit for an amplifer that I can fit
that can provide _DC_ to 2MHz at 2A output?

Push/pull running off 12VDC single rail would be ideal.

Best regards,

James Palmer
From: pimpom on 6 Feb 2010 06:12
James Palmer wrote:
> I am building a workbench function generator from an XR2206
> chip.
>
> Would anyone here have a tested circuit for an amplifer that I
> can fit
> that can provide _DC_ to 2MHz at 2A output?
>
> Push/pull running off 12VDC single rail would be ideal.
>

It will be difficult to get AC output down to 0Hz with a single
rail power supply. The only way I can think of off the top of my
head is to incorporate a polarity inverting converter to get a
dual-rail +/- supply inside the unit anyway.

If you don't mind dc offset at the output for the triangle and
sinusoidal waveforms or if you want only rectangular pulses, then
it would be possible to use a single rail PS.


From: Phil Hobbs on 6 Feb 2010 07:20
On 2/6/2010 6:12 AM, pimpom wrote:
> James Palmer wrote:
>> I am building a workbench function generator from an XR2206
>> chip.
>>
>> Would anyone here have a tested circuit for an amplifer that I
>> can fit
>> that can provide _DC_ to 2MHz at 2A output?
>>
>> Push/pull running off 12VDC single rail would be ideal.
>>
>
> It will be difficult to get AC output down to 0Hz with a single
> rail power supply. The only way I can think of off the top of my
> head is to incorporate a polarity inverting converter to get a
> dual-rail +/- supply inside the unit anyway.
>
> If you don't mind dc offset at the output for the triangle and
> sinusoidal waveforms or if you want only rectangular pulses, then
> it would be possible to use a single rail PS.
>
>

Float the supply and use a couple of power devices to split it in half.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
From: George Herold on 6 Feb 2010 08:47
On Feb 6, 5:31 am, jamespal...(a)lifestat.com (James Palmer) wrote:
> I am building a workbench function generator from an XR2206 chip.
>
> Would anyone here have a tested circuit for an amplifer that I can fit
> that can provide _DC_ to 2MHz at 2A output?
>
> Push/pull running off 12VDC single rail would be ideal.
>
> Best regards,
>
> James Palmer

I like the power opamp from TI. OPA544. It won't make your 2 MHz.
spec though.

Buy two of them and use one to define ground as Phil H. suggests.

If 2MHz is important you'll have to roll your own output stage.

George H.
From: Jamie on 6 Feb 2010 12:44
Phil Hobbs wrote:

> On 2/6/2010 6:12 AM, pimpom wrote:
>
>> James Palmer wrote:
>>
>>> I am building a workbench function generator from an XR2206
>>> chip.
>>>
>>> Would anyone here have a tested circuit for an amplifer that I
>>> can fit
>>> that can provide _DC_ to 2MHz at 2A output?
>>>
>>> Push/pull running off 12VDC single rail would be ideal.
>>>
>>
>> It will be difficult to get AC output down to 0Hz with a single
>> rail power supply. The only way I can think of off the top of my
>> head is to incorporate a polarity inverting converter to get a
>> dual-rail +/- supply inside the unit anyway.
>>
>> If you don't mind dc offset at the output for the triangle and
>> sinusoidal waveforms or if you want only rectangular pulses, then
>> it would be possible to use a single rail PS.
>>
>>
>
> Float the supply and use a couple of power devices to split it in half.
>
> Cheers
>
> Phil Hobbs
>
exactly, a Virtual ground :)



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