CURRENT MIRROR Russian patent published in 2009 - IPC G05F3/26 H03F3/04 H03F3/343 

FIELD: radio engineering and communication.

SUBSTANCE: invention relates to radio engineering and commutation and can be used as a functional unit incorporated with various analog signal amplifiers, various-purpose analog microcircuits, e.g. operational amplifiers (OA), voltage stabilisers and comparators. Proposed current mirror comprises input (1) and output (2) transistors with their bases interconnected, while their emitters are connected to bus (3) of the 1^st power source. Note here that input transistor collector is connected with current mirror input (4), while output transistor collector is connected with current mirror output (5). Additionally, proposed circuit incorporates 1^st (6) and 2^nd (7) transistors and extra inverting current amplifier (8) with its input (9) connected to collector of the said 1^st transistor and its output (10) connected to current mirror output (5). Emitter of the 2^nd transistor (7) is connected to that of the 1^st transistor and to current mirror input (4). Bases of the 1^st and 2^nd are connected to the circuit (11) of setting static potential. Note here that collector of the 2^nd transistor is connected with the base of input (1) and output (2) transistors. The circuit additionally incorporates transistor (11) with its emitter connected to collector of auxiliary transistor (6), its base being connected to emitter of output transistor (2) and collector being connected to bus (3) of the 1^st power source.

EFFECT: higher accuracy of current transmission.

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