| 摘要 |
A complementary class AB current mirror circuit with a constant current gain which, when driven by a transconductance amplifier, provides a constant overall voltage gain over a wide range of output current. Such current mirror circuit includes cross-coupled pairs of current mirror circuits, both of which are driven by a common reference current and each of which selectively receives a respective portion of the input signal current. The upper pair of current mirror circuits includes: an input current mirror circuit which generates a drive current for the output stage of the lower pair of current mirror circuits; and an output current mirror circuit which generates the source, or "push," portion of the output signal current. The lower pair of current mirror circuits includes: an input current mirror circuit which generates a drive current for the output stage of the upper pair of current mirror circuits; and an output current mirror circuit which generates the sink, or "pull," portion of the output signal current.
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