A 10GS/s 2V/sub pp/ emitter follower only track and hold amplifier in SiGe BiCMOS technology

This paper presents an emitter follower only track and hold amplifier (THA) in 0.25mum SiGe BiCMOS complementary HBT technology. By using a sequence of pnp and npn emitter followers (pnp-npn EF), we enhance the linearity of the THA input buffer for an input signal of 2Vpp. The THA achieves 8bits of accuracy at 10GHz of sampling rate with a 3GHz 2Vpp input signal. This is about three bits more than currently reported 10GS/s THAs in npn-only technology at this wide signal swing

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