Resistive Sensing Techniques

Voltage Divider

• Simple
• Low-cost
• Good when $R_x$ is large ($I$ is low), bad if $R_x$ is small ($I$ is too high)
• Non-linear $V_{out}$ to $R_x$ relationship

Current Divider

• Simple (but more complex than a voltage divider)
• Low-cost
• Good when $R_x$ is small, poor choice when $R_x$ is large
• Non=linear relationship between $I_{out}$ and $R_x$
• May require TIA to convert $I_{out}$ to $V_{out}$

Bridge Circuit

• Can use $V_{out}$ or $I_{out}$ configuration for high or low $R_x$
• More components
• Receiver must accept differential voltage signal or current signal
• We can use a TIA (tranimpedance amplifier) to take $I$ in and give $V$ out.