| 摘要 |
<p>A digital/analogue converter for converting an input n-bit digital code (n >1), comprising: a switched capacitor digital/analogue converter (14) having a plurality of capacitors (C<SUB>1</SUB>...C<SUB>n</SUB>). The lower plate of each is connectable, dependent on the input digital code, to either a first reference voltage (V<SUB>2</SUB>) or a second reference voltage (V<SUB>3</SUB>) different from the first reference voltage. The converter also comprises at least one further capacitor (C<SUB>P</SUB>), and a switching arrangement (18,19) for connecting the lower plate of the or each first further capacitor to either a third reference voltage or a fourth reference voltage different from the third reference voltage. The input to the first switching arrangement is independent of the input digital code. In the decoding phase, the output voltage floats to a voltage that depends on both the input data code and the direction and magnitude of charge injection across the further capacitor(s) (C<SUB>P</SUB>).</p> |
