An Adaptable 6.4 - 32 GS/s Track-and-Hold Amplifier with Track-Mode Masking for High Signal Power Applications in 55 nm SiGe-BiCMOS

64-GS/s 6-Bit Track-and-Hold Circuit with More Than 61 GHz Bandwidth at 1.0 Vpp Input Voltage Swing in 90-nm SiGe BiCMOS Technology

“…Differential amplifier stages steepen the edges of the clock signal, with one of them acting as a delay element for the SPA, and intermediate emitter follower buffers provide driving capability and level shifting. This architecture has shown valuable results, ranging from a 6.4-GS/s [2] and a 12.8-GS/s [3] chip for radar applications to a 32-GS/s circuit with 58-GHz bandwidth in [4]. Emitter follower buffers facilitate input and output matching with a differential 100 Ω resistance, as they exhibit a high input impedance, as well as a low output impedance around 5 Ω.…”