Bilateral current source
The described circuit employs a precision current source configuration, utilizing resistors R1 through R5 to establish a stable output current that maintains a high degree of accuracy. The circuit is designed to achieve a current relationship accuracy within 2%, even when the resistance of R1 varies between 100 ohms and 2000 ohms. This is particularly important in applications requiring precise current control, such as in analog signal processing or sensor interfacing.
The choice of resistor values is critical; using 1% tolerance resistors for R1 through R5 ensures minimal deviation in the output current under varying conditions. The resistors R1 through R4 are selected to be of relatively high resistance values, which serves to reduce the impact of any variations in R1 on the overall circuit performance. This design consideration is crucial, as it allows the circuit to mitigate errors that could arise from fluctuations in the resistance values, thereby enhancing the reliability of the current output.
The OP-08 operational amplifier is utilized in this circuit due to its superior input bias current performance. This characteristic allows the circuit to maintain accuracy even when utilizing large resistors, as high input bias currents can introduce significant errors in low-current applications. The OP-08's low input bias current helps to preserve the integrity of the current relationship by minimizing the voltage drop across the resistors, which could otherwise lead to inaccuracies.
Overall, the combination of precision resistors and the OP-08 operational amplifier results in a robust circuit capable of delivering a consistent and accurate current output, making it suitable for various electronic applications where precision is paramount.The circuit will produce the current relationship to within 2% using 1% values for Rl through R5. This includes variations in Rl from 100 ohm to 2000 ohm. The use of large resistors for Rl through R4 minimizes the error due to Rl variations The large resistors are possible because of the excellent input bias current performance of the OP-08,.
Related Circuits
This circuit utilizes commonly available components to create a 0-to-200-nA current source. It incorporates a PMOS transistor from the input stage of a DC4007A, which is more accessible than a standalone PMOS transistor. The CA3130 operational amplifier functions as...
A simple 120 V to 24 V center-tapped control transformer, along with four additional components, can accomplish the task. This circuit produces a clean 200 V peak-to-peak square wave at 60 Hz and is capable of supplying up to...
This circuit allows for setting a limit on the maximum output current from a power supply unit (PSU). It is particularly useful for initial project power-ups or during soak tests. By establishing an upper current limit, it protects both...
The converter features eight decades of current range. The circuit is intended to be used with the 200 mV range of a DVM. The described converter circuit is designed to accommodate a wide range of current measurements, spanning eight decades....
Afshin Izadian at Indiana University has developed a new power inverter that utilizes a single switching transistor and is capable of generating infinite-level voltages. The power inverter designed by Afshin Izadian represents a significant advancement in the field of power...
Field bus technology and intelligent instrument technology are currently two of the most rapidly evolving technologies in automation and control. In the realm of field bus technology, the CAN bus has established itself as a relatively fast communication standard...