The article suggests an evaluation method of offset voltage of BiJFet differential difference operational amplifiers (DDAs), based on the theory of autonomous multiport circuit. The static error of DDA, connected with the offset voltage (V-io), can be presented by the current autonomous parameter I-p connected with the highimpedance node, entered into its classical equivalent circuit. The parameter I-p is determined by the DDA circuitry and ideally it must have zero value. The conditions for the synthesis of the main functional nodes of DDA are obtained, whereby V-io approximate to 0 is provided in the range of low temperatures and radiation effect. An example of construction of BiJFet-DDA with small V-io and its drift is given.