design of circuit problem

Hello

I created a R - 2R ladder network (joint it photo below) to convert digital-to-analog and I used an op amp to amplify the output of the R - 2R ladder somelevel network. The problem here is that I'm not able to generate ouput when I connect the same versatile Board circuit and it gives precise ouput in multisim someone pls help me what could be the problem.

The common 741 op amp input mode range is specified as +/-12 V with a power supply +/-15V. Due to the input of this beach circuit design won't change much with the supply voltage. The tension on the no reverse entry in your circuit is ~0.6 V which is well outside the common-mode input range.

If you need to use a single power supply, then look for an amplifier with negative power included in the common-mode input range.

Also consider the range of output voltage. For the 741, the output range is of +/-12 V minimum and +/-14 V typical, which means that your circuit cannot guarantee a lower than 3 V output voltage regardless of the digital input.

Polarization R11 R12 circuit does not a lot because the R - 2R network has a much lower impedance. R11 is in parallel with the impedance of the network (R) output.  The contribution of the 12 V bias is about 70 mV.  Input bias current must flow in input of OPAMP becaues they are the bases of the NPN transistors. If the output of the R - 2R network is located at the entrance common mode range enough current polarization runs through the network (error 80 typical uV).  If the output is not in the circuit's common-mode input range will not work if the impedance will not matter.

Lynn

Tags: NI Software

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