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Gain Block Specification Selection Guide
(Gp, Ga, |S21|2, GCR)

  -----------------------------------High Gain-----------------------------------
  HPMX-3002 32 dB
  INA-01xxx 32 dB
  INA-02xxx 31 dB
  IVA-05xxx 30 dB
  INA-03xxx 26 dB
  INA-10xxx 26 dB
  IVA-14xxx 24 dB
  MSA-08xx 23 dB
  MGA-835xx 22 dB
  INA-53xxx 22 dB
  INA-34xxx 21 dB
  --------------------------------Moderate Gain--------------------------------
  INA-51xxx 20 dB
  INA-54xxx 20 dB
  MGA-865xx 20 dB
  INA-50xxx 19 dB
  MSA-06xx 19 dB
  MSA-01xx 19 dB
  HMMC-5004 19 dB
  MGA-855xx 18 dB
  MSA-31xx 18 dB
  INA-32xxx 18 dB
  MSA-20xx 17 dB
  MSA-21xx 16 dB
  INA-12xxx 16 dB
  INA-31xxx 15 dB
  --------------------------------Lower Gain--------------------------------
  MGA-725xx 14 dB
  MGA-875xx 14 dB
  MGA-825xx 13 dB
  INA-30xxx 13 dB
  MSA-07xx 13 dB
  MGA-815xx 12 dB
  MGA-641xx 12 dB
  MSA-02xx 12 dB
  MSA-03xx 12 dB
  MSA-11xx 12 dB
  HMMC-5003 11 dB
  HMMC-5200 9.5 dB
  HMMC-5220 9.5 dB
  MSA-99xx 9 dB
  MSA-09xx 8 dB
  MSA-04xx 8 dB
  MSA-05xx 8 dB
    0                 10                   20                   30                   40  
  Gain [dB]  

The amount of power amplification provided by the gain block in dB.

Most gain blocks are intended to be used without additional matching. For these amplifiers the power gain (Gp) is also equal to |S21|2 (The unmatched gain in a 50 ohm system). Some ICs are intended to be used with additional matching and the gain specified may be a tuned gain depending on this matching. If the matching provides an optimal noise match to the input and a conjugate (optimal gain) match to the output, then the gain is called associated gain (Ga).

The input power Pin (in dBm) is equal to Pout (in dBm) - Gp (in dB). Some amplifiers are designed to have their gain adjusted by a control voltage; these devices will typically have a gain control range (GCR) specified. The GCR is the amount by which the gain may be decreased from the maximum gain in dB. Typical GCR's are in the 20 - 30 dB range though ranges as high as 50 dB may be encountered. Gain decreases with frequency and increases with bias.

Needs to fit application. More gain means less stages but too much gain can lead to stability problems or saturation. In general more is better.

6 - 35 dB

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this page last updated: 1 October 1999