SL2524LC

SL2524 1.3GHz Dual Wideband Logarithmic Amplifier DS4548 - 2.1 July 1995 The SL2524 is a pin compatible replacement for the SL2521 and SL2522 series of log amplifiers, and exhibits a superior stability performance. The amplifier is a successive detection type which provides linear gain and accurate logarithmic signal compression over a wide bandwidth. The two stages can be operated independently. When six stages (three SL2524s) are cascaded the strip can be used for IFs between 30-650MHz whilst achieving greater than 65dB dynamic range with a log accuracy of 65dB of input dynamic range, with pulse handling of better than 25ns. (See figs 5 and 6.) A six stange strip also offers balanced IF limiting, linearity (log accuracy) of < ±1.0dB, temperature stabilisation and programmable detector characteristics. The detector has an external resistor set (RSET) pin which allows the major characteristics of the detector to be programmed. With six stage strip it is possible to vary the value of RSET on each detector and so improve the overall log error/linearity. The detector is full wave and good slew rates are achieved with 2ns rise and 5ns fall times (no video filter). The video bandwidth of a six stage strip is typically 600MHz (-3dB). The amplifier also offers balanced IF limiting, low phase shift versus input amplitude, and at an IF of 120MHz, less than 5° of phase change is achievable over the input level of -55dBm to +5dBm. The IF and Video ports can be used simultaneously, so offering phase, frequency and pulse (video) information. A slight loss of dynamic range (2dB) will be observed when the IF ports are used in conjunction with the video. Fig.4 Test circuit Fig.5 Schematic diagram showing configuration of SD Log strip 5 SL2524 Fig.6 Circuit diagram for 6-log strip (results shown in figs. 11 to 24 were achieved with this circuit) Typical characteristics for a dual - stage amplifier (i.e. One SL2524) Fig.7 IF Gain vs frequency of 2 amplifiers (One SL2524) 6 SL2524 Typical characteristics for a dual - stage amplifier (i.e. One SL2524) cont. Fig.8 Normalised phase vs CW input level at 50, 250 and 450MHz for 50Ω O/P termination (25°C) Fig.9 Detector current vs RSET at 200MHz (25°C) 7 SL2524 Typical characteristics for a dual - stage amplifier (i.e. One SL2524) cont. Fig.10 Detector current vs frequency at RSET = 200Ω and 500Ω (25°C) Typical characteristics for a six stage strip, using detected output (Ref. figs 5 & 6) Fig.11 Detector bandwidth (25°C) 8 SL2524 Typical characteristics for a six stage strip, using detected output (Ref. figs 5 & 6) cont. 0 Fig.12 Detected O/P vs CW input at 60, 125, 450 and 600MHz at 25°C Fig.13 Detected O/P vs CW input level and temperature at 60 and 125MHz 9 SL2524 Typical characteristics for a six stage strip, using detected output (Ref. figs 5 & 6) cont. Fig.14 Detected O/P vs CW input level at 450MHz across temperature Fig.15 Typical log linearity of detected output measured at 450MHz (25°C) 10 SL2524 Typical characteristics for a six stage strip as a low phase shift wideband limiter (Ref. figs 5 & 6) Fig.16 IF limiting characteristics at 60MHz and 500MHz (25°C) Fig.17 IF limiting characteristic at 60MHz across temperature 11 SL2524 Typical characteristics for a six stage strip as a low phase shift wideband limiter (Ref. figs 5 & 6) Fig.18 IF limiting characteristic at 500MHz across temperature Fig.19 Small signal gain vs frequency across temperature 12 SL2524 Typical characteristics for a six stage strip as a low phase shift wideband limiter (Ref. figs 5 & 6) Fig.20 Phase deviation vs CW input level (normalised at -30dBm) at 25°C across input frequency Fig.21 Phase deviation vs CW input level (normalised at -30dBm) at 50MHz across temperature 13 SL2524 Typical characteristics for a six stage strip as a low phase shift wideband limiter (Ref. figs 5 & 6) Fig.22 Phase deviation vs CW input level (normalised at -30dBm) at 450MHz across temperature Fig.23 Peak phase deviation over -65dBm → +10dBm CW input level vs CW input frequency. Across temperature 14 For more information about all Zarlink products visit our Web Site at w ww.zarlink.com Information relating to products and services furnished herein by Zarlink Semiconductor Inc. or its subsidiaries (collectively “Zarlink”) is believed to be reliable. However, Zarlink assumes no liability for errors that may appear in this publication, or for liability otherwise arising from the application or use of any such information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or use. Neither the supply of such information or purchase of product or service conveys any license, either express or implied, under patents or other intellectual property rights owned by Zarlink or licensed from third parties by Zarlink, whatsoever. Purchasers of products are also hereby notified that the use of product in certain ways or in combination with Zarlink, or non-Zarlink furnished goods or services may infringe patents or other intellectual property rights owned by Zarlink. This publication is issued to provide information only and (unless agreed by Zarlink 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. The products, their specifications, services and other information appearing in this publication are subject to change by Zarlink without notice. No warranty or guarantee express or implied is made regarding the capability, performance or suitability 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. Manufacturing does not necessarily include testing of all functions or parameters. 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 Zarlink’s conditions of sale which are available on request. Purchase of Zarlink’s I2C components conveys a licence under the Philips I2C Patent rights to use these components in and I2C System, provided that the system conforms to the I2C Standard Specification as defined by Philips. Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc. Copyright Zarlink Semiconductor Inc. All Rights Reserved. TECHNICAL DOCUMENTATION - NOT FOR RESALE