*Question E6C04:
Which of the following is an advantage of BiCMOS logic?*  

*Correct Answer is  C: It has the high input impedance of CMOS and the low output impedance of bipolar transistors*  

### AI Response: (may contain errors)  

BiCMOS logic combines the best features of both Bipolar and CMOS technologies. Here's why the correct answer is correct and the others are not:

1. **Correct Answer: C - It has the high input impedance of CMOS and the low output impedance of bipolar transistors**

   - **High Input Impedance of CMOS**: CMOS (Complementary Metal-Oxide-Semiconductor) technology is known for its high input impedance, which means it draws very little current from the preceding stage. This is beneficial for minimizing power consumption and loading effects.
   
   - **Low Output Impedance of Bipolar Transistors**: Bipolar transistors, on the other hand, provide low output impedance, which allows them to drive larger loads effectively. This is useful for delivering more current to the next stage or load.

   Combining these two characteristics, BiCMOS logic can efficiently interface with both high-impedance and low-impedance circuits, making it versatile for various applications.

2. **Why the Other Choices are Incorrect:**

   - **Choice A: Its simplicity results in much less expensive devices than standard CMOS**
     - BiCMOS is not necessarily simpler or less expensive than standard CMOS. In fact, integrating both bipolar and CMOS technologies can increase complexity and cost due to the need for additional processing steps in manufacturing.

   - **Choice B: It is immune to electrostatic damage**
     - BiCMOS is not inherently immune to electrostatic discharge (ESD). While CMOS technology is generally more susceptible to ESD than bipolar, BiCMOS does not eliminate this vulnerability. Proper ESD protection measures are still required.

   - **Choice D: All these choices are correct**
     - Since choices A and B are incorrect, choice D cannot be correct.

In summary, the advantage of BiCMOS logic lies in its ability to leverage the high input impedance of CMOS and the low output impedance of bipolar transistors, making it suitable for a wide range of applications where both characteristics are desirable.