Question

In the ISFET pH measurement system, the voltage circuit has ........ impedance and the current circuit has ......... impedance.

• A. High, Low
• B. zero, High
• C. Low, zero
• D. Low, High

Hint:

In ISFET systems, ensuring high impedance in the voltage circuit and low impedance in the current circuit is crucial for accurate measurements.

Answer 1

The Correct Option is A

Step 1: ISFET voltage circuit requirements.
An ISFET voltage measurement circuit requires high impedance to prevent signal disturbance.

Step 2: ISFET current circuit requirements.
An ISFET current measurement circuit requires low impedance for accurate current measurement.

Final Answer: \[\boxed{\text{High, Low}}\]