Experiment on Circuit Design Based on operational amplifier and analog integrated circuit with multisim -- 4

I-V (current-voltage) converter with V-I (voltage current) converter 1, basic I-V Converter

Relationship between output voltage and input current:

Key points:

L r represents the conversion sensitivity here. High sensitivity requires a large resistance, while a large resistance is generally less accurate.

L r can make the impedance in a more general sense, also with capacitance, Inductance

L used in photoelectric Detectors

2, high sensitivity I-V Converter

High sensitivity I-V converter can be used to complete the conversion function with a small resistance

Based on the current relationship at V1:

Then:

3. Floating load Converter

Two types of floating load converter:

Output:

Output:

4. grounding load converter (Howland)

Basic Howland circuit form:

R1 ~ R4 must meet Bridge Balance

Output:

Improved Howland circuit:

Here, r2a + r2b is used to replace the above R2 resistance, and the bridge balance is still required.

Output: