Measure DC currents in your circuit by measuring voltages across known resistors using the multi-meter. (1) Use one CD4007 package to build the simple current source shown in Figure 1, replacing the ideal current source with the resistor value that you calculated in your pre-lab work. The IREF pin diagram for the CD4007 is shown in the data sheet (Figure 3). Note that all NMOS substrates must be connected to the lowest potential. Vary the load resistance connected between the output node (the drain of and to M2) VDD generate different drain-to-source voltages. each load resistance, measure the reference and output currents and IREF IOUT, ► For — respectively as well as the output voltage (VD of Take measurements for at least six M2). — different values of load resistance. (2) Use two CD4007 packages to build the modified Wilson circuit in Figure 2, replacing the ideal current source with the resistor value that you calculated in your pre-lab work. IREF Note that all NMOS substrates must be connected to the lowest potential. Vary the load resistance connected between the output node (the drain of and to M2) VDD generate different drain-to-source voltages. each load resistance, measure the reference and output currents and IREF IOUT, ► For — respectively as well as the output voltage (VD of Take measurements for at least six M2). — different values of load resistance. Note: The simple current source of Figure 1 will be used in subsequent labs (Labs #4–#6), so you may wish to keep it assembled once you have it working properly. Figure 3. CD4007 Pin-Out and Specifications Analysis of results For the simple current source (Figure 1):
Measure DC currents in your circuit by measuring voltages across known resistors using the multi-meter. (1) Use one CD4007 package to build the simple current source shown in Figure 1, replacing the ideal current source IREF with the resistor value that you calculated in your pre-lab work. The pin diagram for the CD4007 is shown in the data sheet (Figure 3). Note that all NMOS substrates must be connected to the lowest potential. Vary the load resistance connected between the output node (the drain of M2) and VDD to generate different drain-to-source voltages. ► For each load resistance, measure the reference and output currents — IREF and IOUT, respectively — as well as the output voltage (VD of M2). Take measurements for at least six different values of load resistance. (2) Use two CD4007 packages to build the modified Wilson circuit in Figure 2, replacing the ideal current source IREF with the resistor value that you calculated in your pre-lab work. Note that all NMOS substrates must be connected to the lowest potential. Vary the load resistance connected between the output node (the drain of M2) and VDD to generate different drain-to-source voltages. ► For each load resistance, measure the reference and output currents — IREF and IOUT, respectively — as well as the output voltage (VD of M2). Take measurements for at least six different values of load resistance. Note: The simple current source of Figure 1 will be used in subsequent labs (Labs #4–#6), so you may wish to keep it assembled once you have it working properly. Figure 3. CD4007 Pin-Out and Specifications Analysis of results For the simple current source (Figure 1):