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

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: 50  output drivers
Stripline printed circuit boards
or short lines
50  output drivers

6. BER Measurement PRBS source Attenuation Error measurement BER PRBS

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 over a range of input power (Pin) and data rates
Dynamic range of transimpeadance Amp (TIA) limits maximum input power
May need to reduce Pin to get normal operation

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

10. BER is related to Eye Diagram
Vertical eye opening
Proportional to x in BER 10-x
Practically only good to 10-8

11. MAX 3266 Evaluation Kit
Hook your input into J1 and your Limiting Amplifier into J2 and J3 and your ready to test.

12. MAX3264 Evaluation Kit
Connect your TIA to J4 and J5 and J2 and J3 to your output and your ready to go. LOS threshold programming also done here.

13. Test of Eval Boards