[sdiy] Ring Mod (was Re: Hadamard Transform Network)

[Tom Wiltshire]

On 17 May 2017, at 16:28, Neil Johnson <neil.johnson71 at gmail.com> wrote:

> Hi,
> 
> David G Dixon wrote:
>> Also, if a "ring modulator" and a "4-quadrant balanced modulator" give
>> exactly the same transfer function, then why can't the terminology by used
>> interchangeably?
> 
> They don't give the same transfer function, so you shouldn't
> interchange the words.

Further explanation please, Neil.

Like David, it was my understanding that a diode ring modulator gave the same sum and difference frequencies when fed with clean square waves like you suggested. In which case, it would be doing 4 quadrant multiplication in that limited case.

Is that not right? Why not?

Thanks,
Tom