Digital storage, addition and subtraction of time-mode variables

Presented are novel digital methods to perform storage, addition and subtraction of time-mode variables. The concept of a switched delay unit is introduced and by adopting this key element, the instantaneous phase difference between two rising edges can be latched and used to perform various arithmetic operations. The proposed technique can be used to implement analogue sampled-data signal processing using digital circuitry. Simulation results are provided.