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SA5204AN Fiches technique(PDF) 11 Page - NXP Semiconductors |
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SA5204AN Fiches technique(HTML) 11 Page - NXP Semiconductors |
11 / 14 page Philips Semiconductors Product specification NE/SA5204A Wide-band high-frequency amplifier 1992 Feb 25 11 intermodulation ratio is illustrated in Figure 22, which shows product output levels plotted versus the level of the fundamental output for two equal strength output signals at different frequencies. The upper line shows the fundamental output plotted against itself with a 1dB to 1dB slope. The second and third order products lie below the fundamentals and exhibit a 2:1 and 3:1 slope, respectively. The intercept point for either product is the intersection of the extensions of the product curve with the fundamental output. The intercept point is determined by measuring the intermodulation ratio at a single output level and projecting along the appropriate product slope to the point of intersection with the fundamental. When the intercept point is known, the intermodulation ratio can be determined by the reverse process. The second order IMR is equal to the difference between the second order intercept and the fundamental output level. The third order IMR is equal to twice the difference between the third order intercept and the fundamental output level. These are expressed as: IP2=POUT+IMR2 IP3=POUT+IMR3/2 where POUT is the power level in dBm of each of a pair of equal level fundamental output signals, IP2 and IP3 are the second and third order output intercepts in dBm, and IMR2 and IMR3 are the second and third order intermodulation ratios in dB. The intermodulation intercept is an indicator of intermodulation performance only in the small signal operating range of the amplifier. Above some output level which is below the 1dB compression point, the active device moves into large-signal operation. At this point the intermodulation products no longer follow the straight line output slopes, and the intercept description is no longer valid. It is therefore important to measure IP2 and IP3 at output levels well below 1dB compression. One must be careful, however, not to select too low levels because the test equipment may not be able to recover the signal from the noise. For the NE/SA5204A we have chosen an output level of –10.5dBm with fundamental frequencies of 100.000 and 100.01MHz, respectively. ADDITIONAL READING ON SCATTERING PARAMETERS For more information regarding S-parameters, please refer to High-Frequency Amplifiers by Ralph S. Carson of the University of Missouri, Rolla, Copyright 1985; published by John Wiley & Sons, Inc. “S-Parameter Techniques for Faster, More Accurate Network Design”, HP App Note 95-1, Richard W. Anderson, 1967, HP Journal. “S-Parameter Design”, HP App Note 154, 1972. a. Input VSWR vs Frequency b. Output VSWR vs Frequency 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 FREQUENCY—MHz TA = 25 oC VCC = 6V ZO = 75Ω ZO = 50Ω . 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 FREQUENCY—MHz Tamb = 25 oC VCC = 6V ZO = 75Ω ZO = 50Ω 2.0 1012 4 6 8 2 4 6 8 102 103 1012 4 6 8 2 4 6 8 102 103 SR00213 Figure 21. Input/Output VSWR vs Frequency -60 -50 -40 -30 -20 -10 0 +10 +20 +30 +40 +30 +20 +10 0 -10 -20 -30 -40 2ND ORDER INTERCEPT POINT 2ND ORDER RESPONSE 3RD ORDER RESPONSE INPUT LEVEL dBm THIRD ORDER INTERCEPT POINT 1dB COMPRESSION POINT FUNDAMENTAL RESPONSE SR00214 Figure 22. |
Numéro de pièce similaire - SA5204AN |
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Description similaire - SA5204AN |
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