How to implemet Mixer practically

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dilan2005

Member level 4
transistor mixer circuit

i have so many notes ,and theories:

"use a mixer with in put x(t) and Acos(ft) and out put of x(t)XAcos(ft) is the x(t) signal shifted by f in frequency domain",

any how i want to know what are the practical circuit to implement this mixer(or the multiplier)?

thanx

ieropsaltic

Full Member level 4
single transistor mixer

Yes, the output spectrum will be shifted by f at frequency domain.
For practical mixer implementation, one way is to use the non-linearity of certain devices as diodes or transistors to generate |n*f1±m*f2| where n, m are integers and f1, f2 are the required drequenciese ti be mixed together.
Another way to perform the mixing function is to use the carrier frequency to drive switches to reverse the polarity of the input signal.
For more information concerning mixer circuits you may refer to "RF microelectronics" by Behzad Razavi, chapter 6.

dilan2005

points: 2

dilan2005

Member level 4
transistor mixer

thanks.
do you have any circuit that i can build.

simple one.

khouly

one transistor mixer

check single transistor mixer , it is qyite simple

khouly

m10mn

Junior Member level 1
single transistor mixer circuits

by using a single transistor and biasing two of the ports you can easily make a mixer(which is a king of multiplier).

dilan2005

Member level 4
2 input mixer circuits

Please can any one give me a sample schematic of one transistor mixer?

thx

dilan2005

Member level 4
mixer circuits using transistors

I need RF mixer(Multiplyer,actually multiply two wave forms),not a audio mixer

A=x(t)
B=Ecos(2ft)
AXB<----i want this

tanks

A.Anand Srinivasan

simple transistor mixer circuit

dude one of the circuits that i posted (the FET model) have 2 inputs and you just have to feed the two waves that you are talking about....

dilan2005

Member level 4
simple transistor mixer schematic

actually i need a multiplier,not adder
(in Rf terms we called mixer for multiplier)

a good name is "modulator"
sorry for my wrong words in earlier posts
thx

firewind

Member level 1
circuit schematic of a thx mixer

if you're trying to build on transistor level, I normally design my mixer with a differential amplifier type.

A.Anand Srinivasan

application note transistor mixer

try this circuit....

Abhishekabs

transistor mixer circuits