Mixer (Multiplier)....

[hykwei]

Hi everyone!

I am looking for a wide bandwidth mixer (around 20 MHz) for building a simple DSB (Double Side Band) Modulator and Demodulator...

I hav been looking through the web...and the only chip that I found is a LM1496 chip, which is quite an old chip and it needs a lots of circuitry to make it as a proper modulator/demodulator.

Does anyone know whether there is any newer mixer chip (or modulator) that can perform better than LM1496? or a chip which requires less circuitry...

Thank you for your help!

 

[on1aag]

Hi Hykwei,

Take a look at these, maybe you'll get an idea:

**broken link removed**

**broken link removed**

https://www.electro-tech-online.com/custompdfs/2007/05/LMH6503.pdf

on1aag.

 

[Hero999]

How accurate is your frequency?

If it's from a simple LC oscillator then you can easilly integrate the mixer into your oscillator design.

What frequency is the modulating voltage?

A simple common emitter amplifier can act as a mixer.

 

[Nigel Goodwin]

A simple common emitter amplifier can act as a mixer.

So can a diode, but neither are double balanced (or even single balanced).

 

[Hero999]

Can't balancing be done with a transformer?

I'm a bit rusty as far as RF is concerned.

 

[Nigel Goodwin]

Can't balancing be done with a transformer?

Yes, you can do it with transformers (plural), and a diode ring (looks rather like a bridge rectifier). This is actually a VERY good solution, because it's got very high signal handling properties, heres a suitable link:
https://www.radio-electronics.com/i...alanced_mixer/diode_double_balanced_mixer.php