Calculating Group Delay in Delta Sigma Converters
Delta-sigma converter group delay equals the phase derivative across decimation filter stages, calculated as K times M minus one divided by twice the modulator clock for sinc filters.
Dynamic Sample Rate Switching
Operation Protocol
Control mechanism for altering the acquisition frequency of a measurement system during active data collection. Dynamic sample rate switching allows a device to transition between high resolution monitoring and power saving modes without resetting the hardware interface. It manages the internal clock dividers and filter coefficients to prevent data corruption during the change.
Transition Logic
Implementation of this process requires the synchronization of buffer resets and phase locked loop adjustments. While dynamic sample rate switching occurs, the system must handle the instantaneous change in Nyquist frequency to avoid aliasing artifacts. State machines inside the controller ensure that the transition completes within a specified number of clock cycles to minimize data loss.
Verification Step
Testing confirms that the system maintains phase continuity and accuracy across the switch. Verification of dynamic sample rate switching requires monitoring the output for transients or missed samples during the transition period.
Application Constraint
Use of this feature is limited by the settling time of the analog front end and the capacity of the downstream bus. Dynamic sample rate switching is unsuitable for applications requiring continuous phase tracking across the transition boundary. External triggers or internal threshold detections usually initiate the change based on the signal characteristics observed in real time.