QL Series II DC Supplies: Linear Regulation

True Linear Output Regulation

for the best possible performance

Despite the improvements in high frequency switcher design, Linear regulation still offers the lowest output noise and the best transient response (recovery time from a sudden current step). It also offers the most benign stability characteristics when driving complex load conditions.

Ultra-low noise

Most linear regulated power supplies offer low output noise with figures below 2mV rms being typical. The QL series goes a stage further with an RMS noise figure of 0.35mV and tightly specified pk-pk noise.

Many higher power linear regulated designs include a line frequency switched pre-regulator. Whereas this may not compromise differential output noise, it significantly increases common mode noise currents.

The QL Series uses true linear regulation without any line frequency switching regulation. Consequently it offers exceptional common mode noise levels of <4µA rms at 20MHz bandwidth.