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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]                                                                                                             What: 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"). Direction: When it matters, higher isolation is better. Range: -10 dBm to -50 dB typical

this page last updated: 1 October 1999