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SL521ACM Datasheet(PDF) 5 Page - Zarlink Semiconductor Inc |
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SL521ACM Datasheet(HTML) 5 Page - Zarlink Semiconductor Inc |
5 / 7 page SL521 Fig.5 Maximum rectified output current v. temperature (typical) Fig.6 Noise figure v. temperature (typical) Fig.7 Input admittance with open-circuit output (typical) Fig.8 Direct Coupled amplifiers Fig.9 Suitable interstagetuned circuit OPERATING NOTES The amplifiers are intended for use directly coupled, as shown in Fig 8. The seventh stage in an untuned cascade will be giving virtually full output on noise. Noise may be reduced by inserting a single tuned circuit in the chain As there is a large mismatch between stages a simple shunt or series circuit cannot be used The choice of network is also controlled by the need to avoid distorting the logarithmic law; the network must give unity voltage transfer at resonance A suitable network is shown in Fig 9. The value of C1 must be chosen so that at resonance its admittance equals the total loss conductance across the tuned circuit Resistor R1 may be introduced to improve the symmetry of filter response, providing other values are adjusted for unity galn at resonance. A simple capacitor may not be suitable for decoupling the output line if many stages and fast rise times are required. Alternative arrangements may be derived, based on the parasitic parameters given. Values of positive supply line decoupling capacitor requlred for untuned cascades are given below. Smaller values can be used in high frequency tuned cascades. Number of stages 6 or more 5 4 3 Minimum capacitance 30nF 10nF 3nF lnF The amplifiers have been provided with two earth leads to avoid the introduction of common ground lead inductance between input and output circuits. The equipment designer should take care to avoid the subsequent introduction of such inductance. The 500pF supply decoupling capacitor has a resistance of, typically, 1 0Q. It is a junction type having a low breakdown voltage and consequently the positive supply current will increase rapidly if the supply voltage exceeds 7.5V (see Absolute Maximum Ratings). |
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