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Comprehensive 8-Channel Downconverter System Architecture with AD8343 Mixers and Amplifiers

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This document outlines the detailed block diagram of an 8-channel downconverter system operating at 1.3 GHz. It includes components such as the AD8022 mixer, AD8343 mixers for each channel, and a series of filters and amplifiers, each with specific gain specifications. The system supports RF input signals and provides defined linearity, noise estimation, and dynamic behavior characteristics. Key performance metrics include crosstalk measurements and offset behaviors. This architectural design aims to optimize RF signal processing efficiency across multiple channels.

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Comprehensive 8-Channel Downconverter System Architecture with AD8343 Mixers and Amplifiers

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  1. Blockdiagramm 8channel Downconverter 1.3 GHz AD8022 250kHz Mixer1 AD8343 Filter1 DCNet1 Ampl 1 x8.5 RFin1 IF1 Mixer2 AD8343 Filter2 DCNet2 Ampl 2 x8.5 RFin2 IF2 Mixer3 AD8343 Filter3 lDCNet3 Ampl 3 x8.5 RFin3 IF3 Mixer4 AD8343 Filter4 DCNet4 Ampl4 X8.5 RFin4 IF4 Mixer5 AD8343 Filter5 DCNet5 Ampl 5 X8.5 RFin5 IF5 Mixer6 AD8343 Filter6 DCNet6 Ampl 6 X8.5 RFin6 IF6 Mixer7 AD8343 Filter7 DCNet7 Ampl 7 X8.5 RFin7 IF7 Mixer8 AD8343 Filter8 DCNet8 Ampl 8 X8.5 RFin8 IF8 Powersplitter Xinger4A4305 Powersplitter Xinger4A4305 Loin 1.30025GHz Powersplitter Xinger4A1305

  2. Linearity: Distance 1st to second Harmonic of IF 250 to 500 kHz Linearity > 50dB for Rfin < -12dBm

  3. Dynamic behaviour of IF frequency Max Output Level between +3 and +6 dBm for IF of 25 KHz

  4. Crosstalk Crosstalk of < 60 dB

  5. Offset Behaviour Offset < 1mV for RFin < -12dBm Temperture Drift < 1mV/deg C or 0.2 deg RF Phaseshift per 1 deg C

  6. Noise estimation for one channel Downconverter based on AD8343 mixer 500 Ohm 3.3nV/sqrt Hz 2.5nV/sqrt Hz 4.5nV/sqrt Hz (5.6nV/sqrt/ Hz)x 8.5 Mixer1 AD8343 Ampl 1 x8..5 4nV/sqrt Hz ~ 50 nV/sqrt Hz Noise measured with HP 3556A shows 70nV /sqrt Hz in the range 0 to 100KHz Noise for 200 kHz Bandwidth ~ 30 uV rms

  7. Vektormodulator AD8349 With I and Q Signals +- 750 mV pp Measured with R&S type ZVRE Networkanalyzer and 2x Agilent 33220A Waveform Generator Phasefailure 2.0deg_pp for 360deg Amplitudefailure +/- 1 %

  8. Vektormodulator AD 8349 With I and Q Signals +- 1.5 Volts Phase failure 2.5 deg pp Amplitude failure +- 1.25% pp

  9. Vektormodulator AD8349 With IQ input signals +- 2.0 Volts Phase failure 3.1 deg Amplitude failure +- 2.6 %

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