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Current-to-Voltage Converter, TSMC 180nm
The current-to-voltage converter converts current captured from the sensor system to fully differential output voltage, ready to be amplified. Highly linear current to voltage conversion is achieved by using Transimpendance Amplifier (TIA) architecture with 8 current ranges and specially designed built-in offset cancellation. The output signals are ready for further analogue signal processing and analogue-to-digital conversion.
The Current-to-Voltage Converter is ideally suited for a broad range of devices with sensor systems where the generic information about the phenomenon to be measured - light or other physical or chemical or electrochemical appearance - passes the first electrical conversion to the current. The IP implementation enables easy further System on Chip (SoC) integration of follow up functions.
The Current-to-Voltage Converter is ideally suited for a broad range of devices with sensor systems where the generic information about the phenomenon to be measured - light or other physical or chemical or electrochemical appearance - passes the first electrical conversion to the current. The IP implementation enables easy further System on Chip (SoC) integration of follow up functions.
Features
- Detection and measurement of low input current from hundreds of picoA to 1 mA |absolute value|
- Continuous current-to-voltage conversion
- Highly linear transfer characteristic: <1 LSB for 12-bit resolution (resistive load >9 kOhm)
- Fast response time: ~ 25 us
- Unique offset cancelling solution
- Voltage at input pin regulated for all operating modes
- Programmable 8 current ranges
- Current ranges are fully monitored through comparator’s output overload detection
- Fully differential output with output range of 1.3 Vp-p
- Single supply voltage: 1.6 V to 1.8 V
- Low power dissipation: ~ 1.7 mW
- Operating temperature range: -40°C to 125°C
- Small and compact area: ~ 0.8 mm²
Benefits
- Detection and measurement of small input current difference on the level of tens of picoA (with additional signal processing) well suited for biosensors, photosensors, LED and PIN diodes
- Direct interface to the sensor system without external components
- High linearity and fast current-to-voltage conversion
- Single-ended current input with fully differential voltage output for further signal processing
- Low power design ideally suited for battery powered operation
Deliverables
- GDSII layout database
- Assembly guidelines and integration support
- Datasheet
- Behavioural VHDL model for SoC simulations
- Layout footprint
- Application notes
- On demand:
- LVS/SPICE netlist
- MATLAB model for effective system design
Block Diagram of the Current-to-Voltage Converter, TSMC 180nm IP Core
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