| 摘要 |
A current source for providing matched currents at low and variable bias voltages. The current source includes a first circuit, a second circuit, and a biasing circuit. The first circuit provides a first current. The first circuit includes a first transistor with a control terminal, a first terminal, and second terminal. A second circuit provides an output current to an output node. The second circuit includes a second transistor with a control terminal, a first terminal, and second terminal. The biasing circuit includes a third transistor with a control terminal, a first terminal, and second terminal. The biasing circuit also includes a fourth transistor with a control terminal, a first terminal, and second terminal. The biasing circuit provides a voltage at the first terminal of the third transistor and a voltage at the control terminal of the second transistor so that a voltage at the first terminal of the second transistor and a voltage at the second terminal of the first transistor match. Thereby, the first current and output current approximately match.
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