NEW TYPE ADC USING PWM INTERMEDIARY CONVERSION
Abstract
The paper presents a new ADC type that uses an intermediary conversion in PWM signal. The signal is compared with a triangular wave. The pulse width at comparator’s output results proportional with the input voltage. Using a simple counter or a frequency-meter like circuit, it is converted into digital words. This is not a very fast converter (up to 10kS/s) but it is easy to build and it asks reduced costs to expand to multiple simultaneous sampling. This design is aimed for FPGAs, having outside it just a comparator per channel. Hardware signal processing is available immediately in the FPGA. Resolution and accuracy can go as far as 12, 14 or 16 bits. The converter presented in the following is 12 bits resolution and measure voltages from -2 V to 2 V. Static errors are also presented.
Event details
- Event
- IWADC 2007
- Technical Committee
- TC4
- Place
- Iasi, ROMANIA
- Time
- 19 September 2007 - 21 September 2007