*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 advantages of both Bipolar Junction Transistors (BJTs) and Complementary Metal-Oxide-Semiconductor (CMOS) technology. Let's break down the question and the choices:

### Correct Answer: C
**Explanation:**
- BiCMOS logic offers the high input impedance characteristic of CMOS, which means it draws very little current from the input signal. This is beneficial for interfacing with high-impedance sources.
- Additionally, it provides the low output impedance of bipolar transistors, allowing for stronger drive capabilities and faster switching speeds. This combination makes BiCMOS particularly effective in high-speed digital circuits.

### Why the Other Choices are Incorrect:
- **Choice A: Its simplicity results in much less expensive devices than standard CMOS**
  - This is incorrect because BiCMOS technology is generally more complex than standard CMOS. The integration of both bipolar and CMOS transistors increases manufacturing complexity and cost, making BiCMOS devices typically more expensive than standard CMOS devices.

- **Choice B: It is immune to electrostatic damage**
  - While BiCMOS devices may have some improved robustness compared to standard CMOS, they are not completely immune to electrostatic discharge (ESD). In fact, both BiCMOS and CMOS devices can be susceptible to ESD if not properly handled. Therefore, this statement is misleading.

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

### Summary:
- BiCMOS logic is advantageous due to its combination of high input impedance and low output impedance, making it suitable for high-speed applications.
- Remember that while BiCMOS has benefits, it is not simpler or immune to ESD compared to standard CMOS.

This understanding will help you in recognizing the strengths and weaknesses of different logic families in the context of the Extra Class exam.