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Analog Electronics Workshop (AEW)

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  1. Analog Electronics Workshop (AEW) Apr 3, 2013

  2. Contents • Intro to Tools • Input Offset • Input and Output Limits • Bandwidth • Slew Rate • Noise • EMIRR • Filtering

  3. Vos and Ib

  4. Ex 1.1: Hand Calculations 1. Use the circuit and the excerpt of the data sheet below to calculate the maximum and tpical offset form vos.

  5. Ex 1.1: Solution to Hand calculation This term is negligible Simplified equation has nearly the same result

  6. Ex 1.1: Solution to Hand calculation

  7. Ex 1.1: Noise and Offset PCB Setup U0 = OPA211 U1 = OPA277 Note for this experiment Rin will be shorted. For the next experiment Rin will be connected between input and GND.

  8. Ex 1.1: Instrument Setup OPA211 OPA188 211: 127mV 188: 54mV The instrument setup above will configure the signal source and scope for the circuit below so that we can see the I/O limitations.

  9. Ex 1.1: Expected Results 1. Run a “analysis>dc analysis> noise analyais>” simulation to determine total noise. 2. How did the simulated results compare to the hand calculated results.

  10. Ex 1.2: Hand Calculations 1. Use the circuit and the excerpt of the data sheet below to calculate the maximum and tpical offset form vos.

  11. Ex 1.2: Solution to Hand calculation

  12. Ex 1.2: Amplifier I/O PCB Setup Install OPA735 into socket U1

  13. Ex 1.2: Expected Results 1. Run a “analysis>dc analysis>calculate nodal voltages>” simulation to determine the output voltage from vos. 2. How did the simulated results compare to the hand calculated results.

  14. Common Mode And Output Swing I/O Limits

  15. Ex 2.1: Hand Calculations 1. Use excerpt from data sheet below to fill in table: 2. In this example is the limitation from input common mode range or output swing range?

  16. Ex 2.1: Common Mode & Output Swing Schematic U1 is configured as a buffer for these examples. R6 is not installed and R5 is a short. In the top position J1 will connect the scope channel 0 to the output of U1 (as shown). In the bottom connection scope channel 0 is connected to the input signal for U2. U2 is configured in a gain of -34.8. This circuit will be used for bandwidth tests. The myDAQ provides +/-15V dc supplies. The circuit to the left is used to regulate the supplies to +/-2.5V.

  17. Ex 2.1: Amplifier I/O PCB Setup Install OPA735 into socket U1 Set jumper J2 to top position U1 Out to AI(0+)

  18. Ex 2.1: Instrument Setup The instrument setup above will configure the signal source and scope for the circuit below so that we can see the I/O limitations.

  19. Ex 2.1: Expected Results Tina Results myDAQ Results Run transient analysis with the Tina circuit called “AWE-Exp1p1-opa735.tsc” 1. Use the cursors on the myDAQ and Tina Spice tool to measure the amplitude of the clipped signal.

  20. Ex 2.2: Hand Calculations 1. Use excerpt from data sheet below to fill in table: 2. In this example is the limitation from input common mode range or output swing range?

  21. Ex 2.2: Instrument Setup Install OPA277 into socket U2 Set jumper J2 to bottom position signal generator and scope to input

  22. Ex 2.2: Instrument Setup The instrument setup above will configure the signal source and scope for the circuit below so that we can see the I/O limitations.

  23. Ex 2.2: Expected Results 1. Use the cursors on the myDAQ and Tina Spice tool to measure the amplitude of the clipped signal.

  24. Bandwidth

  25. Ex 3.1: Hand Calculations 1. Determine the bandwidth for the circuit below. Draw the closed loop gain (in dB) vs. frequency.

  26. Ex 3.1: Slew Rate PCB Schematic U1 is configured as a buffer for these examples. R6 is not installed and R5 is a short. In the top position J1 will connect the scope channel 0 to the output of U1 (as shown). In the bottom connection scope channel 0 is connected to the input signal for U2. U2 is configured in a gain of -34.8. This circuit will be used for bandwidth tests. The myDAQ provides +/-15V dc supplies. The circuit to the left is used to regulate the supplies to +/-2.5V.

  27. Ex 3.2: Instrument Setup Install OPA333 into socket U1 Set jumper J2 to bottom position signal generator and scope to input

  28. Ex 3.1: Instrument Setup The instrument setup above will configure the signal source and scope for the circuit below so that we can see the bandwidth limitations. Use the curser to determine the bandwidth (-3dB).

  29. Ex 3.1: Expected Results Tina Results myDAQ Results Run transient analysis with the Tina circuit called “AWE-Exp1p1-opa333.tsc” 1. Use the cursors on the myDAQ and Tina Spice tool to measure the bandwidth.

  30. Slew Rate

  31. Ex 4.1: Hand Calculations 1. Draw the output waveform for the circuit below.

  32. Ex 4.1: Slew Rate PCB Schematic U1 is configured as a buffer for these examples. R6 is not installed and R5 is a short. In the top position J1 will connect the scope channel 0 to the output of U1 (as shown). In the bottom connection scope channel 0 is connected to the input signal for U2. U2 is configured in a gain of -34.8. This circuit will be used for bandwidth tests. The myDAQ provides +/-15V dc supplies. The circuit to the left is used to regulate the supplies to +/-2.5V.

  33. Ex 4.1: Amplifier I/O PCB Setup Install OPA735 into socket U1 Set jumper J2 to top position U1 Out to AI(0+)

  34. Ex 4.1: Instrument Setup The instrument setup above will configure the signal source and scope for the circuit below so that we can see the slew rate limitations.

  35. Ex 4.1: Expected Results Tina Results myDAQ Results Run transient analysis with the Tina circuit called “AWE-Exp1p1-opa333.tsc” 1. Use the cursors on the myDAQ and Tina Spice tool to measure the slew rate (rise / run).

  36. Noise

  37. Ex 5.1: Hand Calculations 1. Determine the total rms and peak-to-peak output noise. Note: the switches are as shown (SW3 open, SW2 to GND).

  38. Ex 5.1 Solution to Hand Calc This could be read from the resistor noise chart. Current noise and resistor noise are significant in this example. Reducing Rn would help overall noise. High first stage gain so ignore noise from second stage. Cutoff frequency is much higher then noise corner so ignore flicker.

  39. Ex 5.1 Solution to Hand Calc

  40. Ex 5.1: Amplifier I/O PCB Setup U0 = OPA2211 U1 = OPA2188 Note for this experiment Rin will be shorted. For the next experiment Rin will be connected between input and GND.

  41. Ex 5.1: Noise Schematic Two copies of the same two stage amplifier is on the board. Each two stage amplifier has four jumpers to configure the circuit.

  42. Ex 5.1: Instrument Setup The instrument setup above will configure the signal source and scope for the circuit below so that we can see the bandwidth limitations. Use the curser to determine the bandwidth (-3dB).

  43. Ex 5.1: Expected Results Tina Results myDAQ Results 1. Use the cursors on the myDAQ and Tina Spice tool to measure the slew rate (rise / run).

  44. Ex 5.2: Hand Calculations 1. Determine the total rms and peak-to-peak output noise. Note: the switches are as shown (SW3 closed, SW2 to GND). C1 & R8 form a filter.

  45. Ex 5.2 Solution to Hand Calc

  46. Ex 5.2 Solution to Hand Calc

  47. Ex 5.2: Noise PCB Setup U0 = OPA211 U1 = OPA277 Note for this experiment Rin will be shorted. For the next experiment Rin will be connected between input and GND.

  48. Ex 5.2: Instrument Setup The instrument setup above will configure the signal source and scope for the circuit below so that we can see the bandwidth limitations. Use the curser to determine the bandwidth (-3dB).

  49. Ex 5.1: Expected Results Tina Results myDAQ Results Run transient analysis with the Tina circuit called “AWE-Exp1p1-opa333.tsc” 1. Fill in table below. How effective is the filter in reducing noise?

  50. EMIRR