Conventional digital-to-analog converters perform current-to-voltage (I/V) conversion using Class A/B or Class B topologies and feedback circuits based on operational amplifiers. Because the signal from the DAC chip consists of a series of step changes, crossover distortion, possible phase shift, and timing errors, introduced by these feedback controlled circuits can be a significant limitation on sonic performance.

In contrast, the SwiftCurrent circuit performs I/V conversion with Wadia's patented current-conveyor circuit that operates as a pure Class A device with zero global feedback. This bipolar array consists of an innovative connection of Wilson current mirrors, an emitter degeneration compensation scheme to optimize transient response and stability, and a novel current mirror arrangement to enhance output impedance. The Class A throughput stage eliminates the distortions typical of almost all other I/V conversion circuits.

This discreet implementation of our SwiftCurrent technology was invented to exploit the extraordinary data rate generated in the digital section. Current exiting the converters is mirrored and driven with a zero global feed back Class A throughput stage. Signals remain time and phase coherent throughout the entire system. Why is this important? When accuracy in the time domain is achieved the resulting 3-dimensional sonic image leaves you with the uncanny sensation of being there.