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  High Linearity Components Simplify Direct Conversion Receiver Designs &mdash DN418
  PDF, 73 Kb, 档案已发布: Jun 8, 2007
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  High Linearity Components Simplify Direct Conversion
  Receiver Designs – Design Note 418
  Cheng-Wei Pei
  Introduction
  A direct conversion radio receiver takes a high frequency
  input signal, often in the 800MHz to 3GHz frequency range,
  and utilizes one mixer/demodulator stage to convert the
  signal to baseband without going through an intermediate
  frequency (IF) stage. The resulting low frequency (baseband) signal spectrum has useful information at frequencies from DC to typically a few tens of MHz. Designing
  these receivers requires the use of very high performance
  analog ICs. High performance direct conversion radio
  receiver signal chains for applications such as cellular
  infrastructure and RFID readers require high linearity,
  low noise п¬Ѓgure (NF), and good matching between the
  in-phase and quadrature (I and Q) channels.
  The Right Components for the Job
  Linear Technology’s LT® 5575 direct conversion demodulator has a combination of excellent linearity and noise
  performance. The most important linearity specification
  for direct conversion mixers is the 2nd order intercept
  point (IIP2) due to the 2nd order distortion product falling
  within the baseband output spectrum, and the LT5575
  boasts 54.1dBm at 900MHz (60dBm at 1900MHz). The LT5575 also has high 3rd order linearity and a low noise
  п¬Ѓgure of 12.8dB. …

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• Data Conversion > Analog-to-Digital Converters (ADC) > High Speed ADCs (Fs >=10Msps)

其他名称:

LTC2299IUPTRPBF, LTC2299IUP TRPBF