Posted by GarMan [ 66.48.160.161 ] on January 09, 2005 at 20:50:26:

In Reply to: Grounded Grid posted by Poindexter on January 09, 2005 at 13:26:39:

Hi Poinz,

Sorry, the schematic is not public property, so I can't share it with you. You are correct that a GG circuit has low Zin. In Bruce Rozenblit's design, he uses a cathode follower buffer in front of the grounded grid gain stage to reduce Zin. Not sure if most grounded-grid circuits have high Zout, but this design has a Zout of only 300ohm (have not verify, but going by the book's description). As for gain, this design has a natural gain of 19dB, but total gain is knocked down to 12dB due to the use 7dB of feedback.

Gar.

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