2A wide amplifer for XR2206 sig. gen.

[James Palmer]

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

 

[pimpom]

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.

 

[Jamie]

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

Cheers

Phil Hobbs

exactly, a Virtual ground

 

[Paul Keinanen]

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.

What do you mean by DC ? A stable DC output at +6 V ?

Theoretically (without Vbe losses), you would get 4 Vrms from a +12 V
supply, at 2 Arms the load would appear to be 2 ohms. The Exar chip
output impedance is 600 ohms, so the buffer stage would have to have a
current gain of much more than 300.

Clearly inpossible for a simple complementary pair emitter follower
stage at 2 MHz. A Darlington configuration might be usable with a
smaller voltage swing due to the Vbe losses.