Figure 4 | Scientific Reports

Figure 4

From: Single-Shot Readout Performance of Two Heterojunction-Bipolar-Transistor Amplification Circuits at Millikelvin Temperatures

Figure 4

(a) Measurement pulse signal (derivative) rastered about the (2,0)–(1,1) anti-crossing for the AC-HBT device. Three distinct latched lines are present. (b) 100 single-shot traces of the readout portion of the pulse for the AC-HBT device. Signal separation begins to occur around 4 μs. (c) 2D SNR plot for the CB-HBT readout. (d) 2D SNR plot for the AC-HBT readout. (e) Example histogram from the CB-HBT readout. (f) SNR vs. minimum total measurement time for both circuits, which corresponds to the white dashed line in (c,d). The greater gain of the CB-HBT compensates for the lower bandwidth relative to the AC-HBT. The AC-HBT is also shown scaled by 34% to compare more directly to the CB-HBT, which had a larger SET signal.

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