Transcription of Lecture 9: Intercept Point, Gain Compression and Blocking
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Lecture 9: Intercept Point, Gain Compression and Blocking
EECS 142 Lecture 9: Intercept Point, Gain Compression andBlockingProf. Ali M. NiknejadUniversity of California, BerkeleyCopyrightc 2005 by Ali M. NiknejadA. M. NiknejadUniversity of California, BerkeleyEECS 142 Lecture 9 p. 1/29 p. 1/29 Gain CompressionViVodVodViViVodVodViThe large signal input/output relation can display gaincompression or expansion. Physically, most amplifierexperience gain Compression for large small-signal gain is related to the slope at a givenpoint. For the graph on the left, the gain decreases forincreasing M. NiknejadUniversity of California, BerkeleyEECS 142 Lecture 9 p. 2/29 p. 2/291 dBCompression Point VoVi ViPo, 1dBPi, 1dBGain Compression occurs because eventually theoutput signal (voltage, current, power) limits, due to thesupply voltage or bias we plot the gain (log scale) as a function of the inputpower, we identify the point where the gain has droppedby1 dB.
Finally, equating the cubic terms we have 0 = a1b3 +a22b1b2 +a3b 3 1 b3 = 2a2 2 a5 1 − a3 a4 1 It’s interesting to note that if one power series does not have cubic, a3 ≡ 0, the inverse series has cubic due to the first term above. A. M. Niknejad University of California, Berkeley EECS 142 Lecture 9 …
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