| 摘要 |
Ultra fast high resolution digital-to-analog converter converts input code into a corresponding output current or voltage. The individual currents are continuously adjusted and coupled to an output via switches. Resistors can have two values. On-resistances of any switches and values of capacitors are insignificant. No transistor matching is necessary, wherein FETs are preferred. Current sources provide currents in a response to base signals stored in the capacitors. The resistors conduct the currents and switches couple the currents to the output in response to the input code. A reference circuit provides a reference code and reference signal corresponding thereto. A multiplexer selects a voltage appearing across one of the resistors, in response to the reference code. A comparator compares the selected voltage against reference signal and provides a corrective signal. A demultiplexer applies the corrective signal to one of the capacitors in response to the reference code.
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