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Receiver Circuit Testing

Receiver Circuit Testing. Test setup Eye diagrams BER measurement Eye - BER relationship. Circuit Test Setup. Pattern Generator Attenuator Oscilloscope. Signal Monitoring. Terminated 50  coax for > 1 Mbps capacitance (NRZ data, 50 ohms): 1/2piRC > data rate.

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Receiver Circuit Testing

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  1. Receiver Circuit Testing • Test setup • Eye diagrams • BER measurement • Eye - BER relationship

  2. Circuit Test Setup • Pattern Generator • Attenuator • Oscilloscope

  3. Signal Monitoring • Terminated 50 coax for > 1 Mbps • capacitance (NRZ data, 50 ohms): • 1/2piRC > data rate

  4. RF Oscillation Prevention • Grounded coax for all inputs • Single ground point for bias

  5. RF Circuit Test • 50  transmission line to chip: • Stripline printed circuit boards • or short lines • 50  output drivers

  6. BER Measurement • PRBS source • Attenuation • Error measurement

  7. PRBS source • Pseudo random data is severe test of receiver • Length of zero or one string is critical (ISI) • Eye diagram is “open” for low ISI

  8. Attenuation • Sensitivity of receiver: • BER at fixed pin and data rate • Noise floor due to dynamic range limits • Need to vary pin

  9. Error Measurement • Correlate PRBS and output data • BER = number of errors / data bits sent • BER = 10-9or 10-11 typical • i.e., 1 error per Gbit of data = 10-9

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