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THIS DOCUMENT IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS
ADVANCE INFORMATION
DS3606 - 2.0
SL521
150MHz WIDEBAND LOG AMPLIFIER
The SL521A, B and C are bipolar monolithic Integrated circuit wideband amplifiers, intended primarily for use in successive detection logarithmic IF strips, operating at centre frequencies between 10MHz and 100MHz The devices provide amplification, limiting and rectification, are suitable for direct coupling and incorporate supply line decoupling The mid-band voltage gain of the SL521 is typically12dB(4times) The SL521A, B and C differ mainly in the tolerance of voltage gain and upper cut-off frequency The device is also available as the 5962-90792 which has guaranteed operation over the full Military Temperature Range and is screened to MIL-STD-883 Class B. Data is available separately
CM8
Fig.1 Pin connections - bottom view
FEATURES
s s s s s s s
ABSOLUTE MAXIMUM RATINGS
Wide Defined Gain 4dB Noise Figure Hlgh I/P impedance Low O/Pi mpedance 165MHz Bandwidth On Chip Supply Decoupling Low External Component Count (Non-simultaneous) Storage temperature range Operating temperature range Chip operating temperature Chip-to-ambient thermal resistance Chip-to-case thermal resistance Maximum instantaneous voltage at Video output Supply voltage -65C to +150C -55C to +125C +175C 225C/W 65C/W +12V +9V
ORDERING INFORMATION
SL521 A CM SL521 B CM SL521 C CM 5962-90792 (SMD)
APPLICATIONS
s Logarithmic IF Strips wlth Gains up to 108dB and Linearity better than 1dB
Fig.2 Circuit diagram SL521
SL521
ELECTRICAL CHARACTERISTICS
These characteristics are guaranteed over the following conditions (unless otherwise stated) Temperature = +22C + 2C Supply voltage = +6V DC connection between input and bias pins. Value Min. Typ. Max. 12.5 1 2.7 13.0 12.7 13.0 13.3 Units dB dB dB dB dB dB MHz MHz MHz MHz ns mA mA mA db/V %/V V rms dB mA mA mA Vp-p Conditions
Characteristic Voltage gain, f = 30MHz
Circuits A B C A B C A B C ABC ABC A B C ABC ABC ABC A B C
Voltage gain, f = 60MHz
Upper cut-off frequency (Fig. 3)
Lower cut-off frequency (Fig. 3) Propagation delay Maximum rectified video output current (Fig. 4 and 5) Variation of gain with supply voltage Variation of maximum rectified output current with supply voltage Maximum input signal before overload Noise figure (Fig. 6) Supply current
11.5 11 .3 11.0 11.3 11.0 10.7 150 170 140 170 130 170 5 2 1.00 0.95 0.90 0.7 25 1.8 12.5 12.5 11.5 1.9 4 15.0 15.0 15.0 1.2
10 ohms source, 8pF load
10 ohms source, 8pF load 10 ohms source, 8pF load
7 1.10 1.15 1.20
f = 60MHz, 0.5V rms input
5.25 18.0 18.0 19.0
See note below f = 60MHz, Rs = 450 ohms
Maxiumum RF output voltage
Note: Overload occurs when the input signal reaches a level sufficient to forward bias the base-collector junction to TR2 on peaks.
Fig.3 Voltage gain v. frequency (typical)
Fig.4 Rectified output current v. input signal (typical)
SL521
Fig.6 Noise figure v. temperature (typical)
Fig.5 Maximum rectified output current v. temperature (typical)
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 Minimum capacitance 30nF 10nF
Fig.7 Input admittance with open-circuit output (typical)
Fig.8 Direct Coupled amplifiers
3
3nF lnF
Fig.9 Suitable interstagetuned circuit
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).
SL521
Parasitic Feedback Parameters (Approximate)
The quotation of these parameters does not indicate that elaborate decoupling arrangements are required, the amplifier has been designed specifically to avoid this requirement. The parameters have been given so that the necessity or otherwise of further decoupling, may become a matter of calculation rather than guesswork. V6 V2 =
a
Voltage induced at pin 6 Voltage at pin 2 Voltage at pin 2 (pin joined to pin 7 and fed from 300 source)
= 0.03 (f = 10MHz)
~ I4
V6
=
RF current component from pin 4 Voltage at pin 6
V6 = 20 mmhos V2
=
b
Voltage induced at pin 6 Voltage at pin 2 Voltage at pin 2 (pin 7 decoupled)
= 0.01 (f = 10MHz)
(This figure allows for detector being forward biased by noise signals). I2 V4 V6 I2 V6 = Effective voltage induced at pin 6 Voltage at pin 4 Current from pin 2 Voltage at pin 6 = 0.003 V6 V6 V2
a
V6 V2
b
decrease with frequency above 10MHz at 6dB/octave
=
= 6 mmhos (f = 10MHz)
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
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