Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Noise Designation.

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Presentation transcript:

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Noise Designation and Calculation Signal-to-Noise Ratio  Measure of desired signal power to noise power. Noise Figure  Specifies exactly how noisy a device is. Reactance Noise Effects  Reactive circuits do limit frequency response; significant effect on noise characteristics.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure 1-12 Noise figure versus frequency for a 2N4957 transistor. (Used with permission from SCILLC dba ON Semiconductor. All rights reserved.)

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Noise Designation and Calculation Noise Created by Amplifiers in Cascade  Friiss’s formula Overall noise effect of multistage system

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Noise Designation and Calculation Equivalent Noise Temperature  Means of representing noise produced at output of real-world device or system.  Noise generated by resistor placed at input to noiseless amplifier with the same gain as device or system under consideration.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Noise Designation and Calculation Equivalent Noise Resistance  Manufacturers represent noise generated by a device with a fictitious resistance.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure 1-13 Noise contours for a 2N4957 transistor. (Used with permission from SCILLC dba ON Semiconductor. All rights reserved.)

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Troubleshooting General Troubleshooting Techniques  Ask the right questions.  Take time to learn test equipment, its capabilities, and limitations.  Maintain clear, up-to-date records of all changes made to equipment.  Replace suspicious unit with known good one.  Plot a game plan or strategy.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Troubleshooting Reasons Electronic Circuits Fail  Complete failures  Intermittent faults  Poor system performance  Induced failures

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Troubleshooting Troubleshooting Plan  Symptoms as clues to faulty stages  Signal tracing and signal injection  Voltage and resistance measurements  Substitution

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure 1-14 Signal injection.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure 1-15 Signal tracing.