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Instead of noise coefficient sometimes specify the noise tension of the field Ush transistor - the equivalent noise tension specified to an entrance in a strip of frequencies at a certain full resistance of the generator in the scheme with the general source; noise current of Ish - the equivalent noise current brought to an entrance at the opened entrance in a strip of frequencies in the scheme with the general source.

Advantages of transistors in comparison with electron tubes - the same, as well as at semiconductor diodes - lack of the heated cathode consuming considerable power and demanding time for its warming up. Besides transistors in itself it is many times less on the weight and the sizes, than electric lamps, and transistors are capable to work at lower tension and higher frequencies.

Entrance capacity of the field S11i transistor - capacity between a lock and a source at short circuit on alternating current at the exit in the scheme with the general source. Output capacity of the field S22i transistor - capacity between a drain and a source at short circuit on alternating current on an entrance in the scheme with the general source. Capacity of field transistor S12i through passage - capacity between a lock and a drain at short circuit on alternating current on an entrance in the scheme with the general source. Capacity a lock - SZSO drain - capacity between a lock and a drain at other conclusions opened on alternating current. Capacity a lock - SZIO source capacity between a lock and a source at other conclusions opened on alternating current.

Initial current of a drain of Is.nach - drain current at a tension between a lock and a source, equal to zero and tension on the drain equal or exceeding saturation tension. Residual current of a drain of Is.ost - drain current at a tension between a lock and a source exceeding cut-off tension. Current of leakage of a lock of Iz.Ut - lock current at the set tension between the lock and other conclusions closed among themselves. The return current of transition a lock - IZSO drain - the current proceeding in a chain a lock - a drain at the set return tension between a lock and a drain and the opened other conclusions. The return current of transition a lock - a source of the I ZIO - the current proceeding in a chain a lock - a source at the set return tension between a lock and a source and the opened other conclusions.