Low Frequency Mixer

[abquke]

I've been looking around for chip mixers to implement a low frequency (100kHz-1MHz) lock in amplifier. Seems like in RF that 0GHz starts somewhere around 70MHz. The other way I can think to do it would be a dual-gate FET or the heavy-HAM way of a transistor-with-transformer circuit. Hopefully I'm not seeing the obvious?

[BigBoss]

There are very popular ICs here. Select a appropriate one.
https://www.nxp.com/products/radio-frequency/rf-mixers:MC_71683

[bd139]

AD633 multiplier

https://www.analog.com/media/en/technical-documentation/data-sheets/ad633.pdf

Think the MC1496 is still available. That's a gilbert cell so will go to DC. Also SA612.

Depends what's driving it etc really.

[David Hess]

Instead of a mixer look for an analog multiplier.

[abquke]

Heyyyy exactly what I needed. Thanks!

[TimFox]

-hp- used the 1496 balanced modulator IC in their low-frequency spectrum analyzers and selective voltmeters.