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The effects of back-gating on two basic GaAs precision analogue circuit building blocks have been established. Owing to internal gain, the stability of the single-stage inverter amplifier was found to be most susceptible to both positive and negative side-contact potentials, and the generation of low-frequency oscillations. The use of negative feedback to improve DC stability was demonstrated. In contrast, the source-follower exhibited relatively better stability against back-gating.