Questions about DSB mixer design

[hrkhari]

Mixer Inquiry

Hai Guys:

Currently I am working on the design of DSB mixer, I would appreciate if you could kindly help me out in resolving some arising issues, as below:

1. What shall the output termination resistance range be applied to the output port?. I find that higher settings of resistance value highly improves the Conversion Gain.

2. What is the significance of obtaining the OIP3 and Output 1dB compression point compared to IIP3 and input 1dB compression point in an active circuit topology?.

Thanks in advance

Rgds

 

[sergio mariotti]

Re: Mixer Inquiry

Hai Guys:

1. What shall the output termination resistance range be applied to the output port?. I find that higher settings of resistance value highly improves the Conversion Gain.

Output port= IF Port ? In any case, the 3 Loads should be = Zo (i.e. 50 Ohm), Into coax or Waveguide domains, this give a freedom for the user to use transmission lines to connect other devices like LNA, circulators, filters etc.

2. What is the significance of obtaining the OIP3 and Output 1dB compression point compared to IIP3 and input 1dB compression point in an active circuit topology?.

OIP3=IIP3+Gain [dBm]
OPo1=IPo1+Gain [dBm]