By configuring a radio frequency single-electron transistor as a mixer, we demonstrate a unique implementation of this device, that achieves good charge sensitivity with large bandwidth about a tunable center frequency. In our implementation we achieve a measurement bandwidth of 16 MHz, with a tunable center frequency from 0 to 1.2 GHz, demonstrated with the transistor operating at 300 mK. Ultimately this device is limited in center frequency by the RC time of the transistor's center island, which for our device is ~1.6 GHz, close to the measured value. The measurement bandwidth is determined by the quality factor of the readout tank circuit.
Bibliographical noteFunding Information:
We thank Bob Hill for processing support, and we acknowledge financial support provided by the NASA Office of Space Science under Grant No. NAG5-11426.