Microchip Technology MCP6031DM-PTPLS User Manual
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide
DS51763A-page 8
© 2008 Microchip Technology Inc.
For the design approach of this board, please refer to AN951,
“Amplifying
High-Impedance Sensors - Photodiode Example” (DS00951) as reference
resource. This application note discusses the analog conditioning circuit used for
high-impedance sensors that act like current sensors. The design approach illustrated
in this application note, using op amps, is broken down into three design steps: DC,
stability compensation, closed-loop gain and noise reduction. A design using a PIN
photodiode (light detector) illustrates the principles discussed. Measurement results
are provided to support the theory presented. The last sections of this application note
contain supplemental information.
resource. This application note discusses the analog conditioning circuit used for
high-impedance sensors that act like current sensors. The design approach illustrated
in this application note, using op amps, is broken down into three design steps: DC,
stability compensation, closed-loop gain and noise reduction. A design using a PIN
photodiode (light detector) illustrates the principles discussed. Measurement results
are provided to support the theory presented. The last sections of this application note
contain supplemental information.
MCP6031 Photodiode PICtail™ Plus Demo Board has the following features:
• Supports Microchip MCP6031 high precision op amp
• Uses a transimpedance amplifier as sensor conditioning circuit
• Uses a PIN photodiode (PNZ334) as light detector
• Test points for connecting lab equipment