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2 ghz to 18 ghz limiting amplifier module data sheet HMC7891 rev. 0 document feedback information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 ?2016 analog devices, inc. all rights reserved. technical support www.analog.com features high gain: 47 db p1db output power: 10 dbm saturated output power (p sat ): 13 dbm limiting dynamic range: 40 db minimum field replaceable sma connectors operating temperature: ?40c to +85c applications telecom infrastructure test instrumentation electronic warfare aerospace radar functional block diagram in out + v regulation HMC7891 gnd 13793-001 figure 1. general description the HMC7891 is a limiting amplifier that operates over the band of 2 ghz to 18 ghz, with a high gain of 47 db. the amplifier provides a saturated output power of 13 dbm over the input power range of ?30 dbm to +10 dbm, for a limiting dynamic range of 40 db. the amplifier can also be used as a frequency tripler due to the high third harmonic output level at saturation. see figure 14 for a plot of third harmonic levels with input signals from 2 ghz to 6 ghz with an input drive level of 10 dbm. an integrated voltage regulator provides the proper bias voltage, drawing 300 ma from a single dc power supply of 8 v 1 v. the HMC7891 is packaged in a compact modular design with field replaceable sma connectors.
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HMC7891 data sheet rev. 0 | page 2 of 11 table of contents features .............................................................................................. 1 ? applications ....................................................................................... 1 ? functional block diagram .............................................................. 1 ? general description ......................................................................... 1 ? revision history ............................................................................... 2 ? specifications ..................................................................................... 3 ? absolute maximum ratings ............................................................ 5 ? esd caution .................................................................................. 5 ? pin configuration and function descriptions ............................. 6 ? typical performance characteristics ............................................. 7 ? theory of operation .........................................................................9 ? applications information .............................................................. 10 ? rf front-end protection ........................................................... 10 ? frequency tripling ..................................................................... 10 ? gain equalization ....................................................................... 10 ? outline dimensions ....................................................................... 11 ? ordering guide .......................................................................... 11 ? revision history 10/2016revision 0: initial version
data sheet HMC7891 rev. 0 | page 3 of 11 specifications unless otherwise noted, specificatio ns are with a bias voltage of 8 v a nd a baseplate temperature of 25 c. table 1 . 2 ghz to 6 ghz frequency specifications parameter min typ max unit test conditions/comments frequency range 2 6 ghz gain small s ignal gain 43 47 db ?45 dbm input gain flatness () 2.0 db total flatness over 2 ghz to 18 ghz radio frequ ency ( rf ) output power 1 db compression (p1db) 7 10 13 dbm saturated output power (p sat ) 10 13 16 dbm limi ting dynamic range 40 db ?30 dbm to +10 dbm input se cond harmonic ? 18 dbc 2 ghz to 3 ghz input, output at p sat third harmonic ? 14 dbc 2 ghz input , output at p sat nois e figure 3.4 db return loss small signal operation input 15 db output 22 db dc power input voltage 7.0 8.0 9.0 v curr ent 0.3 0.4 a table 2 . 6 ghz to 12 ghz frequency specifications parameter min typ max unit test conditions/comments frequency range 6 12 ghz gain small signal gain 43 48 db ?45 dbm input gain flatness ( ) 2 .0 db total flatness over 2 ghz to 18 ghz rf output power 1 db compression (p1db) 7 11 14 dbm saturated output power (p sat ) 10 14 17 dbm limiting dynamic range 40 db ?30 dbm to +10 dbm input second harmonic ?15 db c 3 ghz to 6 ghz input , output at p sat third harmonic ?14 db c 2 ghz to 4 ghz input, output at p sat noise figure 2.8 db return loss small signal operation input 19 db output 23 db dc power input voltage 7.0 8.0 9.0 v current 0.3 0.4 a
HMC7891 data sheet rev. 0 | page 4 of 11 table 3 . 12 ghz to 18 ghz frequency specifications parameter min typ max unit test conditions/comments frequency range 12 18 ghz gain small signal gain 43 48 db ?45 dbm input gain flatness () 2.0 db total flatness over 2 ghz to 18 ghz rf output power 1 db compression (p1db) 7 11 14 dbm saturated output power (p sat ) 10 14 17 dbm limiting dynamic range 40 db ?30 dbm to +10 dbm input second harmonic ?15 db c 6 ghz to 9 ghz input , output at p sat third harmonic ?8 db c 4 ghz to 6 ghz input , output at p sat noise figure 3.5 db return loss small signal operation input 17 db output 15 db dc power input voltage 7.0 8.0 9.0 v current 0.3 0.4 a
data sheet HMC7891 rev. 0 | page 5 of 11 absolute maximum rat ings table 4 . parameter rating 8 v bias line 1 0 v rf input level 15 dbm operating temperature range ? 40 c to + 85 c storage temperature range ?65c to +150c eds rating (hbm) c lass 1a stresses at or above those listed under absolute maximum ratings may cause permanent damage to the product. this is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specifi cation is not implied. operation beyond the maximum operating conditions for extended periods may affect product reliability. esd caution
HMC7891 data sheet rev. 0 | page 6 of 11 pin configuration and fu nction descriptions +v in limiting amp HMC7891 2ghz to 18ghz gnd out j3 j4 j1 j2 13793-002 figure 2. pin configuration table 5. pin function descriptions pin no. mnemonic description j1 in rf input. in has a frequency range of 2 ghz to 18 ghz, and an input signal maximum of 15 dbm. j2 out rf output. out has a frequency range of 2 ghz to 18 ghz. j3 +v 8 v input supply. j4 gnd ground connection.
data sheet HMC7891 rev. 0 | page 7 of 11 typical performance characteristics 70 50 30 10 ?10 ?30 ?50 04 2681 01 21 4 2 0 16 18 gain, input and output return loss (db) frequency (ghz) input return loss gain output return loss 13793-003 figure 3. gain, input return loss, and output return loss vs. frequency at 25c 52 44 46 49 51 48 45 47 50 2 6 10 14 4 8 12 16 18 small signal gain (db) frequency (ghz) +85c +25c ?40c 13793-004 figure 4. small signal gain vs. frequency for various temperatures 0 ?40 ?30 ?15 ?5 ?20 ?35 ?25 ?10 2 6 10 14 4 8 12 16 18 input return loss (db) frequency (ghz) +85c +25c ?40c 13793-005 figure 5. input return loss vs. frequency for various temperatures 15 14 13 12 11 10 9 8 7 6 5 +85c +25c ?40c p1db (dbm) 2 6 10 14 4 8 12 16 18 frequency (ghz) 13793-006 figure 6. p1db vs. frequency for various temperatures 20 19 18 17 16 15 14 13 12 11 10 +85c +25c ?40c p sat (dbm) 2 6 10 14 4 8 12 16 18 frequency (ghz) 13793-007 figure 7. saturated power (p sat ) vs. frequency for various temperatures 0 ?40 ?30 ?15 ?5 ?20 ?35 ?25 ?10 2 6 10 14 4 8 12 16 18 output return loss (db) frequency (ghz) +85c +25c ?40c 13793-008 figure 8. output return loss vs. frequency for various temperatures
HMC7891 data sheet rev. 0 | page 8 of 11 18 0 4 10 14 16 8 2 6 12 ?45 ?30 ?20 ?10 0 ?40 ?35 ?25 ?15 ?5 5 10 p out (dbm) p in (dbm) +85c +25c ?40c 13793-009 figure 9 . output power (p out ) vs. input power (p in ) at 2 ghz for various temperatures 18 0 4 10 14 16 8 2 6 12 ?45 ?30 ?20 ?10 0 ?40 ?35 ?25 ?15 ?5 5 10 p out (dbm) p in (dbm) +85c +25c ?40c 13793-010 figure 10 . output power (p out ) vs. input power (p in ) at 10 ghz for various temperatures 18 0 4 10 14 16 8 2 6 12 ?45 ?30 ?20 ?10 0 ?40 ?35 ?25 ?15 ?5 5 10 p out (dbm) p in (dbm) +85c +25c ?40c 13793-0 1 1 figure 11 . output power (p out ) vs. input power (p in ) at 18 ghz for various temperatures 8 0 2 5 7 4 1 3 6 2 6 10 14 4 8 12 16 18 noise figure (db) frequency (ghz) +85c +25c ?40c 13793-012 figure 12 . noise figure vs. frequency for various temperatures ?10 ?50 ?40 ?25 ?15 ?30 ?45 ?35 ?20 2 4 6 8 3 5 7 9 10 second harmonic output power (dbc) input frequency (ghz) +85c +25c ?40c 13793-013 figure 13 . second harmonic output power (p 2 ) vs. input frequency for various temperatures, input power = 10 dbm 2 3 4 5 6 ?5 ?6 ?7 ?8 ?9 ?10 ?11 ?12 ?13 ?14 ?15 third harmonic output power (dbc) input frequency (ghz) +85c +25c ?40c 13793-014 figure 14 . third harmonic output power (p 3 ) vs. input frequency for various temperatures, input power = 10 dbm
data sheet HMC7891 rev. 0 | page 9 of 11 theory of operation the HMC7891 multi stage amplifier is designed to be mounted to a heat sink of a suitable size such that during operation, the back side case temperature never exceeds 85 c. operation of the unit at backside case temperatures greater than 85 c result s in the reduced life of the unit. before applying dc voltages , provide both the rf input and output with 50 ? connections or terminations . never disconnect the rf output when dc voltage is applied to the unit. the unit is designed to be operated over a voltage range of 7 v to 9 v dc (8 v dc nominal). providing less than 7 v can result in failure of the internal regulator t o generate the proper voltage. providing greater than 9 v increases the risk of overheating. the amplifier is operational whenever the dc voltage is applied. there is no additional control circuitry. the maximu m current specification is 0.4 a. the power supply must be capable of providing that much current. to turn on the amplifier, complete the following steps: 1. ve rif y that the dc connections are correct. 2. ve rif y that the rf input is off. 3. apply 7 v to 9 v dc volt age to the + v pin . 4. apply the rf i nput, en sur ing that the power level is less than 10 dbm. t o turn off the amplifier, complete the following steps: 1. turn the rf input off. 2. turn of f the dc supply .
HMC7891 data sheet rev. 0 | page 10 of 11 applications informa tion rf front - end protection the HMC7891 is suitable for use in the front end of a wide variety of rf systems, with an input limiting range of ? 30 dbm to + 10 dbm built in, removing the need for an additional standalone limiter to protect other components in the system. with a low noise figure of 3.5 db, a high gain of 47 db , and a wide bandwidth of 2 ghz to 18 ghz , the HMC7891 is well suited for modern radar, communications, electronic warfare, and multi function systems. frequency tripling when the hm c7891 is driven into hard saturation, the limiting response creates a strong third harmonic at the output . figure 14 shows the typical third harmonic output levels relative to the fundamental output tone. the HMC7891 can be used as a wideband ana log frequency tripler due to this response. as an example, an input tone at 4 ghz with a power level of 10 dbm produce s a 13 dbm fundamental output tone at 4 ghz, as well as a third harmonic at approximately 4.5 dbm ( ? 8.5 dbc) at 12 ghz. the rf output can then be followed with a band - pass filter centered at 12 ghz to filter out the fundamental output and other harmonics. gain equalization many wideband rf components have an undesirable amount of gain variation or negative gain slope over frequency . components and systems requiring gain equalization can be connected to the input of t he HMC7891 , resulting in a flatter response. the limiting amplifier output saturates with i nputs ranging from ? 30 dbm to + 10 dbm for a total limiting dynamic range of 40 db . the saturated output power is flat over frequency and temperature, making the HMC7891 a versatile equalizer suitable for a variet y of environments.
data sheet HMC7891 rev. 0 | page 11 of 11 outline dimensions 12-02-2015-a pkg-000000 controlling dimensions are in inches; millimeter dimensions (in parentheses) are rounded-off inch equivalents for reference only and are not appropriate for use in design. end view side view top view 1.500 (38.10) r 0.049 (1.25) ?0.018 (0.457) 12 3 4 chamfer indicates orientation 0.528 (13.41) 0.328 (8.33) 0.365 (9.27) 0.656 (16.66) 0.460 (11.68) 0.582 (14.78) 0.064 (1.63) 0.375 (9.53) 0.231 (5.87) 1.039 (26.39) 0.162 (4.11) 0.172 (4.37) figure 15. 4-lead module with connector interface [module] (ml-4-2) dimensions shown in inches and [millimeters] ordering guide model temperature range packag e description package option HMC7891 ?40c to +85c 4-lead module with connector interface [module] ml-4-2 ?2016 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d13793-0-10/16(0)

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