Analogue=digital converter using charge balance principle - has integration element supplied with analogue voltage and reference voltage via low-pass filters

摘要

The analogue/digital converter has an integration element with at least two inputs, receiving the analogue voltage (UE) at one of these inputs via a chain of two low pass filters. The output of the integration element is coupled to a DC type flip flop via the D input. The pulses from the flip flop are fed to a counter during a defined measuring interval. The reference voltage (UREF) is fed to the integration element via two low pass filters. The outputs of the first low pass filter (1,2) for the input voltage (UE) and the first low pass filter (4.1) for the reference voltage are coupled together. ADVANTAGE - Reduced jitter effect for digital value.