The replenishing circuitry (219) includes circuitry which has been optimized to minimize any short circuit current which flows through the transistors of the replenishing circuit.

The waveforms are replenished with replenishing circuitry (219) which generates replenishing signals to the oscillating circuit (202) to maintain the sinusoidal oscillating waveforms in the oscillating circuit (202).

A filling circuit is coupled to the buffer for writing the data to the buffer and coupled to the shared resource for receiving the data from the shared resource when the filling circuit has access to the shared resource.

A cleaning circuit installed in parallel with the filling circuit allows circuit 2 to be cleaned during masked time while filling circuit 1 is operating, and vice versa.