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SL1613 Dataheets PDF



Part Number SL1613
Manufacturers GEC Plessey
Logo GEC Plessey
Description WIDEBAND LOG IF STRIP AMPLIFIER
Datasheet SL1613 DatasheetSL1613 Datasheet (PDF)

ADVANCE INFORMATION DS3612 - 1.0 SL1613 WIDEBAND LOG IF STRIP AMPLIFIER The SL1613 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 SL1613 is typically 12dB. FEATURES s Well Defined Gain s 4.5dB .

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ADVANCE INFORMATION DS3612 - 1.0 SL1613 WIDEBAND LOG IF STRIP AMPLIFIER The SL1613 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 SL1613 is typically 12dB. FEATURES s Well Defined Gain s 4.5dB Noise Figure s High I/P impedance s Low O/P impedance s 150MHz Bandwidth s On-Chip Supply Decoupling s Low External Component Count APPLICATIONS s Logarithmic IF Strips with Gains up to 108dB and Linearity Better than 2dB s Low Cost Radar s Radio Telephone Filed Strength Meters Fig.1 Pin connections (top) DP8 MP8 ABSOLUTE MAXIMUM RATINGS Storage temperature range Operating temperature range Thermal resistance Chip-to-ambient SL1613 DP SL1613 MP Chip-to-case SL1613 DP SL1613MP Maximum instantaneous voltage at video output Supply voltage ORDERING INFORMATION -55°C to +150°C -30°C to +85°C 111°C/W 163°C/W 71°C/W 57°C/W +12V 9V SL1613 C DP SL1613 C MP Fig.2 Circuit diagram Fig.3 Voltage gain v. frequency SL1613 ELECTRICAL CHARACTERISTICS These characteristics are guaranteed over the following condiotns (unless otherwise stated) TA = +22°C ±2°C Supply voltage = +6V DC connection between input and bias pins Characteristic Min. Value Typ. Max. Units Conditions Voltage gain 10 12 14 dB Upper cut-off frequency (Fig. 3) 150 MHz Lower cut-off frequency (Fig. 3) 5 MHz Propagation delay 2 ns Max. rectified video output current (Fig. 4 and 5) 0.8 1 1.4 mA Variation of gain supply voltage 0.7 dB/V Variation of maximum rectified output current with supply voltage 25 %/V Maximum input signal before overload 1.9 V rms Noise figure (Fig. 6) 4.5 dB Maximum RF output voltage 1.2 Vp-p Supply current 1.5 20 mA f = 30MHz, RS = 10Ω, CL = 8pF R S = 10Ω, C L = 8pF RS = 10Ω, CL = 8pF f = 60MHz, V = 500mV rms IN See Note 1 f = 60MHz, R S = 450Ω Note 1. Overload occurs when the input signal reaches a level sufficent to forward bias the base-collector junction of TR1 on peaks Fig.4 Rectified output current v. input signal Fig.5 Maximum rectified output current v. temperature Fig.6 Typical figure v. temperature Fig.7 Input admittance with open circuit output SL1613 Fig.8 Direct coupled amplifiers Fig.9 Suitable interstage tuned 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 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 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 gain at resonance. A single capacitor may not be suitable for decoupling the output line if many stages and fast rise times are required. 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 avoid the subsequent introduction of such inductance. Number of stages 6 or more 5 4 3 Minimum capacitance 30nF 10nF 3nF lnF The on-chip 500pF supply decoupling capacitor has a resistance of, typically 10Ω. 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). Centre frequency Dynamic Range Video rise time Bandwidth Output voltage Typical log accuracy 60MHz -75dBm to +15dBm 70nSec approx. 20MHz 0 - 1.5V ±2dB Fig.10 Circuit diagram of low strip SL1613 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 Int.


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