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THIS DOCUMENT IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS
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.
DP8 MP8 FEATURES
s s s s s s s Well Defined Gain 4.5dB Noise Figure High I/P impedance Low O/P impedance 150MHz Bandwidth On-Chip Supply Decoupling Low External Component Count
Fig.1 Pin connections (top)
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 -55C to +150C -30C to +85C
111C/W 163C/W 71C/W 57C/W +12V 9V
APPLICATIONS
s s s Logarithmic IF Strips with Gains up to 108dB and Linearity Better than 2dB Low Cost Radar Radio Telephone Filed Strength Meters
ORDERING INFORMATION
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 = +22C 2C Supply voltage = +6V DC connection between input and bias pins Characteristic Voltage gain Upper cut-off frequency (Fig. 3) Lower cut-off frequency (Fig. 3) Propagation delay Max. rectified video output current (Fig. 4 and 5) Variation of gain supply voltage Variation of maximum rectified output current with supply voltage Maximum input signal before overload Noise figure (Fig. 6) Maximum RF output voltage Supply current Value Min. 10 Typ. 12 150 5 2 1 0.7 25 1.9 4.5 1.2 1.5 Max. 14 Units dB MHz MHz ns mA dB/V %/V V rms dB Vp-p mA Conditions f = 30MHz, RS = 10, CL = 8pF RS = 10, CL = 8pF RS = 10, CL = 8pF f = 60MHz, VIN = 500mV rms
0.8
1.4
See Note 1 f = 60MHz, RS = 450
20
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.9 Suitable interstage tuned circuit
Fig.8 Direct coupled amplifiers
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 10. 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 60MHz Dynamic Range -75dBm to +15dBm Video rise time 70nSec Bandwidth approx. 20MHz Output voltage 0 - 1.5V Typical log accuracy 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 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. (c) GEC Plessey Semiconductors 1993 Publication No. DS3612 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 regarding 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, which are available on request.
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