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this document is for maintenance purposes only and is not recommended for new designs
SL1615 wideband log if strip amplifier the SL1615 is a bipolar monolithic integrated circuit wideband amplifier intended for use in successive detection logarithmic if strips, operating at centre frequencies between 10mhz and 60mhz. the device provides amplification, limiting and rectification, is suitable for direct coupling and incorporates supply line decoupling. the mid-band voltage gain of the SL1615 is typically 12db. features n well defined gain n 4.5db noise figure n high i/p impedance n low o/p impedance n 150mhz bandwidth n on-chip supply decoupling n low external component count applications n logarithmic if strips with gains up to 108db and linearity better than 2db n low cost radar n radio telephone filed strength meters fig.1 pin connections - top view absolute maximum ratings storage temperature range -55 c to +150 c operating temperature range -30 c to +85 c thermal resistance chip-to-ambient 163 c/w chip-to-case 57 c/w maximum instantaneous voltage at video output +12v supply voltage 9v ordering information SL1615 na mp mp8 fig.2 circuit diagram ds3613 - 1.0 advance information
SL1615 min. typ. max. voltage gain, f = 30mhz 10 14 db 10 w source, 8pf load voltage gain, f = 60mhz 10.7 13.3 db 10 w source, 8pf load upper cut-off frequency (fig.3) 130 170 mhz 10 w source, 8pf load lower cut-off frequency (fig.3) 5 mhz 10 w source, 8pf load propagination delay 2 ns maximum rectified video output 0.80 1.40 ma f = 60mhz, 0.5v rms input current (fig.4 and 5) variation of gain with supply 0.7 db/v voltage variation of maximum rectified 25 %/v output current with supply voltage maximum input signal before 1.8 1.9 v/rms see note below overload noise figure (fig.6) 4 db f = 60mhz, rs = 450 w supply current 11.5 20 ma maximum rf output voltage 1.2 vp-p electrical characteristics these characteristics are guaranteed over the following condltions (unless otherwise stated) temperature = +22 c 2 c, supply voltage = +6v, dc connection between input and bias pins characteristic units conditions value note: overload occurs when the input signal reaches a level sufficent to forward bias the base-collector junction of tr1 on pea ks fig.3 voltage gain v. frequency
SL1615 fig.4 rectified output current v. input signal fig.5 maximum rectified output current v. temperature fig.7 input admittance with open circuit output fig.6 typical noise figure v. temperature
SL1615 fig.9 circuit diagram of low strip 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 parallel or series circuit cannot be used. this 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 c3 must be chosen so that at resonance its admittance equals the total loss conductance across the tuned circuit. resistor r12 may be introduced to improve the symmetry of filter response, providing other values are adjusted for unity gain at resonance. a single capacitor may not be suitable for decoupling the output line if many stages and fast rise times are required. centre frequency 60mhz dynamic range -75dbm to +15dbm video rise time 70nsec bandwidth approx. 20mhz output voltage 0 - 1.5v typical log accuracy 2db the on-chip 500pf supply decoupling capacitor has a resistance of, typically 10 w . 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). values of supply line decoupling capacitor required for untuned cascades are given below. smaller values can be used in high frequency tuned cascades. the amplifiers have been provided with two ground leads to avoid the introduction of common ground lead inductance between input and output circuits. the equipment designer should take care to aviod the subsequent introduction of such inductance. number of stages 6 or more 5 4 3 minimum capacitance 30nf 10nf 3nf lnf fig.8 direct coupled amplifiers
SL1615 headquarters operations gec plessey semiconductors cheney manor, swindon, wiltshire sn2 2qw, united kingdom. tel: (0793) 518000 fax: (0793) 518411 gec plessey semiconductors p.o. box 660017 1500 green hills road, scotts valley, california 95067-0017, united states of america. tel: (408) 438 2900 fax: (408) 438 5576 customer service centres france & benelux les ulis cedex tel: (1) 64 46 23 45 tx: 602858f fax : (1) 64 46 06 07 germany munich tel: (089) 3609 06-0 tx: 523980 fax : (089) 3609 06-55 italy milan tel: (02) 66040867 fax: (02) 66040993 japan tokyo tel: (03) 3296-0281 fax: (03) 3296-0228 north america integrated circuits and microwave products scotts valley, usa tel (408) 438 2900 fax: (408) 438 7023. hybrid products, farmingdale, usa tel (516) 293 8686 fax: (516) 293 0061. south east asia singapore tel: (65) 3827708 fax: (65) 3828872 sweden stockholm, tel: 46 8 702 97 70 fax: 46 8 640 47 36 united kingdom & scandinavia swindon tel: (0793) 518510 tx: 444410 fax : (0793) 518582 these are supported by agents and distributors in major countries world-wide. gec plessey semiconductors 1993 publication no. ds3613 issue no. 1.0 june 1993 this publication is issued to provide information only which (unless agreed by the company in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. no warranty or guarantee express or implied is made regard ing the capability, performance or suitability of any product or service. the company reserves the right to alter without prior knowledge the specification, design or price of any product or service. information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. it is the user's responsibility to fully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. these products are not suitable for use in any medical products whose failure to perform may result in significant injury or death to the user. all products and materials are sold and services provided subject to the company's conditions of sale, w hich are available on request.
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