www.micronetics.com/Noise_Source_SMT/Surface_Mount_Microwave.pdf Return to Noise Index SMN7114 SURFACE MOUNT AMPLIFIED NOISE SOURCE 100 MHZ TO 3.0 GHZ DESCRIPTION 7114-C2A The SMN7114 noise module is designed for a wide range of circuit boards. It features high ENR output for uses from built-in-test to jamming. All biasing cir cuitry is built-in making it easy to design into your system. It features a built-in voltage regulator for highly stable output even if your DC supply lines are not. SUITABLE FOR HIGH V OLUME PRODUCTS : SMN7114 TYPICAL DATA The SMN7114 noise source being sur face mount, having a small footprint and available on tape and reel make them ideal for production manufacturing. Traditionally packaged microwave noise sources have been large and costly ren dering them unsuitable for all but large expensive systems. The benefits of having built-in test and calibration can now be brought to mass produced prod ucts so they too can realize the benefits of an onboard noise source. SPECIFICATIONS APPLICATION NOTE Using noise for built-in test: There are two primary uses for employing a noise signal for built-in test. 1. Noise Temperature (noise figure) or sensitivity testing: This test uses the noise source to supply a known excess noise ratio (ENR) to a device under test for a Y-factor measurement. By taking two receiver readings, one with the noise on and one with it off, Y-factor can be determined. By knowing the ENR and Y-factor, one can calculate noise temperature (figure) or sensitivity. 2. Frequency Response: The noise source being broadband can be used as a replacement of a swept source to calculate frequency response of a receiver or other device. By putting in a known spectral signal at the input and taking a reading at the output, one can determine the gain or loss over frequency of the entire system. Noise sources are inherently extremely stable devices. In addition, the circuitry is much simpler than a swept source which increases reliability and lowers cost. For more information on using noise for built-in-test, read the Feb 2004 Microwave Journal article authored by Patrick Robbins of Micronetics. http://www.micronetics.com/articles/microwave_journal_02-04.pdf http://www.micronetics.com/articles/microwave_journal_02-04.pdf • Frequency: 100 MHz to 3.0 GHz • ENR: 45 dB min • Flatness: 2.5 dB max • Impedance: 50 ohms • VSWR: On-state 1.5:1 ( max) Off-state 1.8:1 (max) • Bias: +8 to +18 Vdc @ 90 mA max • Operating Temp: -40 to +85 oC • Storage Temp: -54 to +125 oC • ENR vs Temp: 0.04 dB / deg C • Shutdown Input: ( T T L Compatible) MICRONETICS, HUDSON, NH 03051 / TEL: 603-883-2900 / FAX: 603-882-8987 / [email protected] Logic “0” = Noise Off Logic “1” (open) = Noise On WWW.MICRONETICS.COM www.micronetics.com/Noise_Source_SMT/Surface_Mount_Microwave.pdf SMN7114 SURFACE MOUNT AMPLIFIED NOISE SOURCE 100 MHZ - 3.0 GHZ USEFUL NOISE EQUATIONS Calculating Y-Factor: YFact = N2 / N1 Where N 2 is measured power output with noise source on and N 1 is the measured power output with noise source off. Calculating noise figure from ENR and Y-Factor: NF(dB) = ENR (dB) - 10 log10 (YFact -1) Converting ENR to noise spectral density (N0): 0 dB ENR = -174 dBm/Hz Calculating noise power in a given bandwidth (BW) from noise spectral density: Power (dBm) = N 0 + 10log(BW) HOW TO ORDER Model # S M N 7 1 1 4- C 2 A Indicate Bulk or Tape and Reel when ordering PACKAGE OUTLINE DRAWING MICRONETICS, HUDSON, NH 03051 / TEL: 603-883-2900 / FAX: 603-882-8987 / [email protected] WWW.MICRONETICS.COM