Satellite Radio Receiver Mixer: MAX2682 Tuned 2642.5MHz MAX2682 miniat

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Satellite Radio Receiver Mixer: MAX2682 Tuned 2642.5MHz MAX2682 miniat

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Application Note 1826: 2002
Satellite Radio Receiver Mixer: MAX2682 Tuned 2642.5MHz MAX2682 miniature, low-cost, low-noise downconverter designed lowvoltage operation ideal portable communications equipment. Signals input port mixed with signals local oscillator (LO) port using double-balanced mixer. This downconverter operates with input frequencies between 400MHz 2500MHz, downconverts output frequencies between 10MHz 500MHz
Additional Information: Wireless Product Line Page Additional Information: Quick View Data Sheet MAX2680/MAX2681/MAX2682 Additional Information: Applications Technical Support This application note presents measured performance MAX2682 noise downconverter when tuned satellite receiver system. radio frequency (RF) 2642.5MHz, intermediate frequency (IF) 402.5MHz. High side injection used, placing local oscillator (LO) 3.045GHz. Return loss each port given, along with table gain noise figure. With 5dBm drive level, gain 6.56dB noise figure 13.3dB. MAX2682 Description MAX2682 miniature, low-cost, low-noise downconverter designed low-voltage operation ideal portable communications equipment. Signals input port mixed with signals port using double-balanced mixer. This downconverter operates with input frequencies between 400MHz 2500MHz, downconverts output frequencies between 10MHz 500MHz. MAX2682 downconverter operates from single +2.7V +5.5V supply, ideal hand held applications. Each downconverter features low-power shutdown mode which typically draws less than 0.1µA supply current. MAX2682 downconverter manufactured high-frequency, low-noise, advanced silicon-germanium process offered space-saving 6-pin SOT23 package.
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Figure Typical operating circuit (the values matching components depend frequency downconverter).
MAX2682 mixer been retuned following parameters: 2642.5MHz 402.5MHz frequency 3045MHz (bandwidth) 25MHz 3.3V Figure shows matching networks used make measurements this report.
Figure Matching network 2642.5MHz satellite radio
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Measured Performance
Figure port return loss
Figure port return loss
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Figure port return loss
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Figure Return loss measurement
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Figure shows very flat gain, down only 0.2dB 12.5MHz band edge.
Figure Gain flatness
Isolation 10.67dB 16.67dB Below data taken isolation measurement. -5dBm Isolation -15.67dBm Isolation -21.67dBm 10.67dB
-5dBm
16.67dB
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Figure Test used isolation measurement
Table below contains noise figure data MAX2682 versus power level. Table Noise Figure Data Power (dBm) Gain (dB) 7.26 7.17 7.05 6.86 6.56 (dB) 11.86 12.1 12.36 12.64 12.97 13.3 13.73
Figure Noise figure test signal generator used provide (3.045GHz) HP8638C. MORE INFORMATION MAX2682: QuickView Full (PDF) Data Sheet (136k) Free Sample
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Satellite Radio Receiver Mixer: MAX2682 Tuned 2642.5MHz MAX2682 miniat

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