The following current mirror has emitter resistors added - what effect do they have - select all options that apply:

In the following basic current mirror, differences in the fabrication process of Q1 and Q2 have given rise to an apparent V_BE mismatch of 4mV.  Assuming the thermal voltage, V_T = 26 mV, what is the percentage error in the ratio of ?

The following Zener regulator circuit is used to smooth the ripple on an unregulated power supply.  Given the following information, determine the correct preferred

value for the current limiting resistor,

• V = 15 V (average)
• V_out = 12 V
• 0 mA < I_L < 50 mA
• I_Z(min) = 2 mA
• P_Z(max) = 700 mW

In the previous circuit, assuming the correct current limiting resistor was used, determine the maximum power dissipation in the Zener diode under no load conditions.  Select the closest answer.

The same circuit in the previous question is used to make an unregulated power supply.  Calculate the approximate ripple voltage, given the following information:

• V_p = 15 V
• C = 1000 μF
• R_Load = 100 Ω

The following circuit is used as the basis of an unregulated power supply.  Firstly determine the unloaded output AC voltage, V₂, from the transformer given the following information:

• N₁ = 10000 turns
• N₂ = 500 turns
• V₁ = 240 Vrms

Select all the characteristics that apply to this Bode Plot

Match the correct type of filter response with the relevant bode-plots.

Select all the answers that correspond to the characteristics of Sallen-Key Filters

Identify the following 'forbidden' regions on the characteristic curves of the JFET when selecting the operating point.