Abstract
Successive approximation register (SAR) analog-to-digital converter (ADC) manufacturers recommend the use of a driver amplifier to achieve the best performance. When a driver amplifier is not used, the conversion speed is severely penalized because of the need to meet the settling time constraint. This paper proposes a simple digital correction method to raise the performance (conversion speed and/or accuracy) when the acquisition chain lacks a driver amplifier. It is intended to reduce the cost, size and power consumption of the conditioning circuit while maintaining acceptable performance. The method is applied to the measurement of the output power delivered by a series resonant inverter for domestic induction heating.
Highlights
Successive approximation register (SAR) analog-to-digital converter (ADC) manufacturers recommend the use of a front-end circuit that consists of two parts: a driving amplifier and an RC filter [1,2]
VI N represents the input voltage to be converted, Rin is the equivalent input resistance connected to the ADC, and Cin is the equivalent input capacitance resulting from a charge-reservoir capacitor and the parasitic capacitance of the ADC input pin
The compensation can be performed by the digital system in charge of the ADC’s control because it involves only one addition and one multiplication per sample
Summary
Successive approximation register (SAR) analog-to-digital converter (ADC) manufacturers recommend the use of a front-end circuit that consists of two parts: a driving amplifier and an RC filter [1,2]. The former can be used to implement a low pass anti-aliasing filter as shown in Figure 1; the Rin , Cin components are needed to isolate the driving circuit from the kick due to the switched capacitors of the ADC’s input structure. The designer is no longer concerned with the noise or distortion introduced by the Sensors 2019, 19, 4343; doi:10.3390/s19194343 www.mdpi.com/journal/sensors
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