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Gain Block Specification Selection Guide
Reverse Isolation
(s12, ISO)

  -----------------------------------High Isolation-----------------------------------
  HMMC-5004 50 dB
  MGA-865xx 46 dB
  INA-31xxx 44 dB
  MGA-855xx 41 dB
  INA-51xxx 38 dB
  HMMC-5003 37 dB
  INA-03xx 37 dB
  MGA-641xx 35 dB
  INA-54xxx 34 dB
  INA-01xxx 33
  INA-02xxx 33 dB
  INA-34xxx 33 dB
  MGA-835xx 32 dB
  ------------------------------Moderate Isolation------------------------------
  MSA-04xx 30 dB
  INA-10xxx 30 dB
  INA-52xxx 27 dB
  INA-30xxx 25 dB
  MGA-815xx 24 dB
  MGA-725xx 23 dB
  INA-12xxx 22 dB
  MSA-08xx 22 dB
  MGA-825xx 22 dB
  --------------------------------Low Isolation--------------------------------
  INA-50xxx 20 dB
  MSA-31xx 18 dB
  MSA-20xx 18 dB
  MSA-01xx 18 dB
  MSA-06xx 17 dB
  MSA-02xx 16 dB
  MSA-03xx 16 dB
  MSA-07xx 16 dB
  MSA-21xx 15 dB
  HMMC-5200 15 dB
  HMMC-5220 15 dB
  MSA-04xx 13 dB
  MSA-11xx 13 dB
  MSA-05xx 13 dB
0 10 20 30 40 50  
  Isolation [dB]  

A measure of how much signal can leak from the output of the device back to the input. Isolation is usually expressed in terms of dBs.
The s parameter s12 directly measured isolation. Isolation in dB is equal to 20*log10(s12). This number may be expressed either as a positive number (dBs of isolation) or a negative number (20*log10[s12]).
Isolation is of most interest for buffer amplifiers. In this application, high isolation prevents impedance mismatches, such as those caused by reflections from the mixer, from changing the oscillator frequency ("pulling").

When it matters, higher isolation is better.

-10 dBm to -50 dB typical
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this page last updated: 1 October 1999