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 p in and data rate Noise floor due to dynamic range limits –Need to vary p in

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