matching diodes

[Martin Czech]

:::voltage. It were old germanium types in glass housings. this glass may have
:::insulated the heat, wich then stayed longer than I cared to wait. 
:::What i mean to say is I don't think you will ever match diodes (or
:::transistors) this way very good. 

A blower will force equal temperature.

:::I would prefer diodes that are placed on one piece of Si. (perfectly mached
:::and on the same temperature).
:::Do they exist? I know of diode arrays to protect digital circuits but

Not really. This is the reason for using discrete.
There are some SMD bridges, but I don't know how good they are.

:::would it be possible to reduce (eliminate?) carrier bleed trough by changing
:::the DC offset of the carrier? if the ringmod is loaded with a not too high
:::impedance DC offset would mean the current trough the diodes varies with the
:::carrier amplitude. DC offset would mean vari the current trough one pair of
:::the diodes. this could compensate for diode voltage mismatch, or am I wrong?
:::maybe I should buy two transformers and try it. 
:::

It is easier to do this with a transistor multiplier circuit.
If amplitudes get larger, diode ring modulators will allways have speak
through. The diodes work as switches, so offset trimming may help a bit,
but will not really cure the desease.

Maybe series resistance if a better way? Then only the knee voltage
for little currents would be important, larger current will be 
influenced more by the resistors.

m.c.