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sl1521 300mhz wideband log amplifier the sl1521a and c are wideband amplifiers intended for use in successive detection logarithmic if strips operating at centre frequencies of up to 200mhz. it is a plug in replacement for the sl521 series of rf amplifiers the midband voltage gain of the sl1521 is typically 12db the sl1521a and c differ mainly in the tolerance of voltage gain applications n radar if strips n wideband amplication absolute maximum ratings (non-simultaneous) storage temperature range -55 c to +150 c operating temperature range -55 c to +125 c maximum chip operating resistance 150 c chip to ambient thermal resistance 250 c/w test circuits: see fig.8 ordering information sl1521 a cm sl1521 ab cm sl1521 c cm sl1521 cb cm fig.1 pin connections cm8 fig.2 circuit diagram fig.3 voltage gain v. frequency fig.4 maximum rectified output current v. temperature
sl1521 min. typ. max. voltage gain, f = 120mhz sl1521a 11.5 12.5 db 3mv rms input sl1521ac 10.8 13.1 db 50 ohms source voltage gain, f = 160mhz sl1521a 11.2 12.8 db 8pf load + 500 w sl1521c 10.6 13.4 db upper cut-off frequency sl1521a 250 285 mhz sl1521c 285 mhz lower cut-off frequency all types 6 10 mhz 50 ohms source propagination delay all types 0.6 ns f = 120mhz maximum rectified video output sl1521a 0.95 1.05 ma 0.5v rms input current sl1521c 0.90 1.20 ma 8pf load, 500 ohms in parallel variation of gain with supply voltage all types 1.0 db/v variation of maximum rectified all types 30 %v output current with supply voltage maximum input signal before overload all types 1.5 v rms see note below noise figure 4.5 6.0 db f = 120mhz, source supply current all types 10.0 15.0 20.0 ma resistance optimised maximum rf output voltage all types 1.0 v p-p f = 120mhz electrical characteristics test condltions (unless otherwise stated): temperature = +22 c 2 c supply voltage = +5.2v dc connection between input and bias pins value units conditions circuits characteristic 50 ohms source operating notes the amplifiers are intended for use directly coupled, as shown in fig 7 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. 8 the value of c1 must be chosen so that at resonance its admittance equals the total loss conductance across the tuned circuit. a simple capacitor may not be suitable for decoupling the output line if many stages and fast rise times are required. values of positive supply line decoupling capacitor required for untuned cascades are given below. smaller vah~es can be used in high frequency tuned cascades. the amplifiers have been provided with two earth leads to avoid the introduction of common earth lead inductance between input and output circuits the equipment designer should take care to avoid the subsequent introduction of such inductance fig.5 typical noise figure v. temperature number of stages 6 or more 5 4 3 minimum capacitance 30nf 10nf 3nf lnf
sl1521 fig.7 direct coupled amplifier fig.8 suitable interstage tuned circuit fig.6 input admittance with open-circuit output
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