A voltage level shifter comprises complementary transistors T1, T2 connected between a supply line vdd and an inverting input !IN. The gate of the transistor T1 is connected to a direct signal input IN whereas the gate of the transistor T2 receives a shifted version of the direct input signal from a source-follower comprising the transistors T3 and T4. The level shifter may also be embodied as a differential cross-coupled sense amplifier with the sources of the drain load transistors being crossed coupled to the differential inputs.