| 摘要 |
A first semi-conductor has a first threshold voltage and provides a particular voltage drop across it in its saturated state of operation. A second semi-conductor has a second threshold voltage and provides the particular voltage drop across it in its saturated state of operation. The second semi-conductor may be a native device. The first and second semi-conductors are connected to provide a common flow of current. A current is induced, as by a third semi-conductor, to flow in the second semi-conductor. The first and second semi-conductors are commonly biased to produce a flow of saturated current through them when a current is induced to flow in the second semi-conductor. Each of the first, second and third semi-conductors may be provided with a gate, drain and source. The sources and drains of the semi-conductors may be in series. The gates of the first and second semi-conductors may be commonly biased and the gate of the third semi-conductor may be biased to produce the flow of current through the second and third semi-conductors. A circuit may be connected across the first semi-conductor and may be provided with first and second states of operation. In the first state, the saturated current flows through the third, second and first semi-conductors and, in the second state, the saturated current flows through the third and second semi-conductors and the parallel circuit. The parallel circuit may be included in a digital-to-analog converter in which bits are disposed in rows and columns and in which an analog value is produced by activating bits in selected rows and columns.
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