[sdiy] On the topic of ring modulation (Using FETs instead of diodes?)

[Ove Ridé]

On 14 August 2014 20:43, Donald Tillman <don at till.com> wrote:
>
> On Aug 14, 2014, at 6:03 AM, Tom Wiltshire <tom at electricdruid.net> wrote:
>
>> Perhaps you could try using four precision rectifier circuits in the ring configuration to overcome the diode turn-on threshold. Diode ring modulators usually use germanium diodes for the lower threshold voltage, but with the precision rectifier circuit, you could probably use cheap silicon diodes - 1N4148s or whatever.
>
> It wouldn't be a ring modulator.
>
> The diode ring modulator depends on the diode nonlinearity, which the precision rectifier circuit doesn't have.

Could you explain this further? Are you saying the circuit wouldn't
work with a theoretical diode which is fully on when forward biased
and fully off when reverse biased?

-- 
/Ove

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