Precision current mirror circuit
AssigneeSamsung Electronics Co., Ltd.
InventorDong-Cheol Lee
Life of this patent
Estimating the term…
Abstract
A precision current mirror circuit eliminates current-loss on the mirror side, and ultimately causes the current source and output current to be the same. The circuit includes a signal input/output means for outputting a current mirror of an input signal, a current control means for controlling a current difference between the input signal and an output signal of the signal input/output, mean and a current amplifier which amplifies the current, as needed, to perform the current control.
Claims15
A precision current mirror circuit, comprising:
- signal input/output means having a first current mirror of two transistors, the current of one of said transistors being the same as the current of the other of said transistors;
- current control means having two different conductivity type transistors, for controlling the base currents of said transistors of said first current mirror of said signal input/output means;
- current amplifying means for controlling the currents of said transistors of said current control means by amplifying the currents of said transistors of said current control means so that their base currents cancel each other.
A precision mirror circuit having an input terminal connectable to receive an input current and an output terminal which supplies an output current, comprising:
- a first current mirror having an input transistor and an output transistor respectively coupled to said input and output terminals, said input and output transistors having their bases connected together at a connection node;
- current control means having a first transistor and a second transistor of opposite conductivity types, said first and second transistors having their bases connected to each other and coupled to said input terminal, said current control means controlling the base currents of said input and output transistors of said first current mirror;
- and
- a current amplifier coupled to said current control means and controlling currents of said first and second transistors such that their base currents are the same and cancel each other at said input terminal.
Dependencies are inferred from the claim text.