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LT5537EDDB Datasheet(PDF) 10 Page - Linear Technology |
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LT5537EDDB Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  10 LT5537 5537fa INPUT POWER (dBm) –100 1.5 2.0 2.5 –20 5537 F10 1.0 0.5 0 –80 –60 –40 0 20 SINGLE ENDED 50 Ω BALUN 264 Ω TA = 25°C 200MHz VCC = ENBL = 3V Figure 7. Measured Output with RIN = 264Ω APPLICATIO S I FOR ATIO The 1:4 input transformer can also be replaced with a narrow band discrete balun circuit using three compo- nents as shown in Figure 6. Capacitors C11, C12 and inductor L1 form a tank circuit having a transformer-like function over a narrow bandwidth. The increased power- to-voltage transformation and the narrower input passband serve to improve the sensitivity of the logarithmic detector. The resonant balun circuit using discrete components can be custom designed for a range of different input imped- ance or sensitivity requirements. Table 2. Matching Network Component Values for 200MHz Center Frequency 10dB EFFECTIVE RETURN C11, INPUT SENSITIVITY LOSS BW L1 C12 R2 RESISTANCE (dBm) (MHz) (nH) (pF) ( Ω)Q ( Ω) –82.4 55 82 15 330 2.1 264 –86.1 18 120 7.5 2k 3.9 828 Figure 6. Input Matching Network IN+ IN– C1 C2 C11 RS RIN C12 L1 R2 J1 INPUT 5537 F07 2 3 The examples given in Table 2 cover two different transfor- mation ratios. The first one transforms single-ended 50 Ω to differential 264 Ω. The VOUT vs PIN transfer curves in Figure 7 indicate that the input power range for linear logarithmic detection is shifted downward by 7dB with a sensitivity improvement of 6dB compared with a simple 50 Ω termination. The input return loss is 30dB at the design frequency of 200MHz. Bandwidth for better than 10dB return loss is 55MHz. The second example has a higher Q of 3.9 and a corresponding transformed imped- ance of 828 Ω. The input power range for linear operation is shifted downward by 12dB with a sensitivity improve- ment of 10dB compared with a simple 50 Ω termination. The input return loss is 25dB at the design frequency. Bandwidth for better than 10dB return loss is 18MHz. |
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