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ce amp
Figure 1. CE amplifier

1. Common-emitter amplifier bias design

For the circuit of Figure 1, “CE amplifier”, select standard values from the E12 series for the resistors to set the following DC bias conditions to within 10%. Report your values in the table and also the predicted collector currents given your selected resistor values. Use VCC = 10 V.

  • Voltage across Re is between 1× and 2× VBE.

  • Q1 collector current is about 5 mA.

  • The collector voltage VC is the middle point of the range where Q1 is in forward-active mode.

  • The total power supply current is 7 mA or less.

Table 1. Folded cascode values
Device Value (units)

R1

R2

Rc

Re

IC1
folded cascode
Figure 2. CE + CB - folded cascode amplifier

2. Folded cascode amplfier bias design

For the circuit of Figure 2, “CE + CB - folded cascode amplifier”, select standard values from the E12 series for the resistors to set the following DC bias conditions to within 10%. Report your values in the table and also the predicted collector currents given your selected resistor values.

  • VOUT = 1.8 V

  • Q1-C and Q2-E node voltage = 3.5 V

  • Q1 and Q2 collector currents = 1 mA

Table 2. Folded cascode values
Device Value (units)

R1

R2

R3

R4

R5

R6

R7

IC1

IC2