High resolution multi-channel voltage reference generator for experiments on quantum-dot devices

High precision, multiple channel, fine tunable voltage references are often required for experiments on quantum-dot devices for controlling the electron states to form specific structure. A fiber-ring based multi-channel voltage reference generator for these experiments is designed and constructed. The generator adopts 20-bit DACs and amplifiers producing high resolution voltages ranging from -10 V to 0 V. By specific fiber-ring structure, several generators may be cascaded together to provide the required number of channels. A number of methods, which effectively constrain the noise level and temperature influence, are also described in the paper. The test results show that the generator has a drift less than 6 ppm/degC of FSR and voltage noise of 3.8 muVms, which is well suitable for our present experiments on quantum-dot devices.