High-speed transimpedance amplifier
Some high-speed transimpedance amplifiers include the OPA847, OPA846, OPA843, and OPA657, offering GHz-range gain-bandwidth products suitable for fast photodiode applications.
Key High-Speed TIA Options
- OPA847: Bipolar input, 3.9 GHz gain-bandwidth product (GBP), 0.85 nV/√Hz input voltage noise, ideal for ultra-fast photodiode signals .
- OPA846: Bipolar input, 1.75 GHz GBP, 1.2 nV/√Hz noise, suitable for high-speed optical detection .
- OPA843: Bipolar input, 800 MHz GBP, 2 nV/√Hz noise, a lower-speed option for moderate bandwidth requirements .
- OPA657: FET input, 1.65 GHz GBP, 4.8 nV/√Hz noise, offering high input impedance but higher voltage noise compared to bipolar devices .
Design Considerations
High-speed TIAs are typically implemented with operational amplifiers in a feedback configuration, converting photodiode current into voltage while maintaining low input impedance to preserve linearity . The achievable bandwidth depends on the source capacitance (photodiode and parasitic capacitances), feedback resistor, and the amplifier's GBP . Bipolar amplifiers generally provide lower input voltage noise, while FET input amplifiers offer higher input impedance but at the cost of increased noise .
Applications
These high-speed TIAs are widely used in:
- Optical communication systems for fast photodiode signal detection
- LiDAR and automotive sensors requiring precise current-to-voltage conversion
- Medical instrumentation and precision metering where high-speed response is critical Selecting the right TIA involves balancing bandwidth, noise, and input impedance according to the photodiode characteristics and the application's speed requirements .
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