2002 APPLICATION NOTE 1826 Satellite Radio Receiver Mixer: M

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2002 APPLICATION NOTE 1826 Satellite Radio Receiver Mixer: M

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Maxim/Dallas Notes WIRELESS, CABLE Keywords: MBCO, Japanese Satellite Radio, Satellite Radio, 2542.5MHz, mobile satellite radio, mixer, downconverter,
2002
APPLICATION NOTE 1826
Satellite Radio Receiver Mixer: MAX2682 Tuned 2642.5MHz
MAX2682 miniature, low-cost, low-noise downconverter designed low-voltage 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 Quick View Data Sheet MAX2680/MAX2681/MAX2682 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.
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
Measured Performance
Figure port return loss
Figure port return loss
Figure port return loss
Figure Return loss measurement 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. Isolation -15.67dBm Isolation -21.67dBm
-5dBm
10.67dB
-5dBm
16.67dB
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.
Application Note 1826: http://www.maxim-ic.com/an1826 More Information technical questions support: http://www.maxim-ic.com/support samples: http://www.maxim-ic.com/samples
Other questions comments: http://www.maxim-ic.com/contact Related Parts MAX2682: QuickView Full (PDF) Data Sheet
AN1826, 1826, APP1826, Appnote1826, Appnote 1826 Copyright 2005 Maxim Integrated Products Additional legal notices: http://www.maxim-ic.com/legal

2002 APPLICATION NOTE 1826 Satellite Radio Receiver Mixer: M

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