Figure 5: Cryogenic electronics.
From: Generation of large coherent states by bang–bang control of a trapped-ion oscillator
(a) Realization of a single-pole triple-throw (SPTT) switch for a switchable control electrode. r and c form low-pass filters for the supply lines of the CMOS switches (V+, V−), with a cutoff frequency of ≈14 kHz. R and C form low-pass filters for the input DC voltages (Va), with a cutoff frequency of ≈14 Hz. As usual in rf traps, the capacitors have the additional function of rf-grounding the control electrodes. Rprot and Rpull are over-current protection and pull-down resistors for the digital control lines of the single-pole single-throws (SPSTs). Va is passed on to the electrode by closing the SPST with a digital high/low level through the control line Vd. (b) Picture of the CEB. The circuitry relative to one of five switches is highlighted in green, a group of seven RC filters in orange and the position of the rf track (inside the printed circuit board) in yellow. The CEB is mounted on a copper structure for thermal contact to the cold plate.
