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A well-matched integrated-circuit current mirror with a switchable output is compensated for switch base current loss by the addition of an extra matching device.
English (United States)
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Switchable Current Source
A well-matched integrated-circuit current mirror with a switchable output is
compensated for switch base current loss by the addition of an extra matching
In the figure, a conventional Wilson current mirror, comprising transistors T1,
T2 and diode-connected transistor T3, accurately mirrors an input current I at
input terminal 1 into the tail of switch transistors T4, T5. With this arrangement.
the output current from the collector (terminal 2 or 3) of the conducting transistor,
instead of being of value I is reduced by an amount equal to the base current
I/Beta of the device.
To overcome this problem, an extra matching transistor T6 operating as a
current source defining the same value current I as in the Wilson mirror, is
connected with its base/emitter path in parallel with the diode transistor T3 of the
Wilson mirror. The arrangement is such that, in operation, an additional base
current of I/Beta is drawn by transistor T6 from the collector current of transistor
T3. This has a further effect on current magnitudes through the entire circuit, as
shown in the figure.
The effect on the operation of the Wilson mirror is that the value of the input
current changes from I to I + 21/Beta 2 and the value of the output current from
the conducting switch transistor T4 or T5 (terminal 2 or 3) is changed from I -
I/Beta to I - 31/Beta 2 + 2I/Beta 3. Since terms including 1/Beta2 and 1/Beta3
represent negligible current, from a practical...