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  • TI Thinks Resolved

CD4066B: CD4066

Part Number: CD4066B

Switch is to be used in circuit for analog integration of AC signal. (range of 0,3Vpp to 1,5Vpp (see below picture).

First, we invert input signal. Then we create positive (rectified) input voltage with usage of S1 and S2 which switches in specific order (see below picture).  In combination with S3 and S4 we expect voltage u_int:

Resulted signal is not as expected.

At S1 and S2 we get strange signals. In order to check S1 and S2 operation, we disconnected integrator circuit.  

After S1 or S2 switching OFF output voltage does not fall to zero but we can see positive voltage which even become negative after some time.

Output S1

Because of this signal become useless for integration.

Please look at the attached file for diagrams.

Thank you and best regards!

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  • Dusan,

    We cannot see your images and attachments.

    Please insert your pictures using the buttons at the top of the text box versus copying the images into the text box. Please add your attachments using the buttons at the top of the text box versus dragging files into the text box.

    Thank you,
    Adam
  • In reply to Adam Torma:

    CD4066.pdfThanks Toma, here are the pictures ..

  • In reply to Dusan BENKO:

    Sorry, ... Adam! :)
  • In reply to Dusan BENKO:

    Dusan,

    When the CD4066 is "OFF" it will create a high impedance path from one side of the switch to the other. The output of S1 and S2 will float when you turn off the switch because there is no path to discharge the voltage.

    Another way to check the operation of the circuit and isolate the CD4066 is to remove the device and short the signal path to see if you have the issue elsewhere in the circuit. Also can you probe the input of the switch compared to the output of the switch? When it is OFF the output will float and when it is ON the input should match the output.

    Thank you,
    Adam

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