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. This is the1 dBcompression point.
1-dB Compression Point Let’s find the input level where the gain has dropped by 1dB 20log 1+ 3 4 a3 a1 S2 1 = −1dB 3 4 a3 a1 S2 1 = −0.11 S1 = s 4 3 a1 a3 × √ 0.11 = IIP3−9.6dB The term in the square root is called the third-order intercept point (see next few slides). A. M. Niknejad University of California, Berkeley EECS 142 ...
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