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using resistor instead of current source in mixer's differential pair

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pavel_adameyko

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Hello, friends)
What are pro and con of using resistor instead of current source in differential pair of Gilbert-type mixer ?
Thanks for advance
 

If you use Resistor, the current won't be constant enough, this will change the OP of the mixer..
Current Mirror is better but it's little bit noisy because it amplifies the noise coming from the reference current source.
 

BigBoss said:
If you use Resistor, the current won't be constant enough, this will change the OP of the mixer..
Click to expand...
Thanks for you reply)
So you mean that there would be additional power consumption, especially at large input signal, as i understand. That's not a big penalty.
 

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