Silicon-on-insulator (SOI) technology has been successfully used for very high performance VLSI circuits for a few years now. These processes employ partially depleted FET devices with floating bodies. To avoid a time-dependent behavior of these devices in sensitive circuitry, selected bodies can optionally be tied to a controlled potential by means of body contacts. The device then is no longer affected by trapped charges within the channel, thus preventing signal-pattern-dependent variations in V_T. The effect of such body contacts on two representative circuits, a CML buffer and a distributed amplifier, has been studied. It is shown that the introduction of body contacts reduces the bandwidth, increases the jitter but also increases the gain of amplifier circuits.
By: Jonas R.M. Weiss, Christian Menolfi, Thomas Morf, Martin L. Schmatz, Heinz Jaeckel
Published in: RZ3602 in 2005
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