| 摘要 |
Many electronic systems such as telephone systems require highly accurate DC-to-AC signal generators such as sine wave generators. A sine wave generator according to the present invention includes a pair of multiplexers, each receiving a plurality of DC voltages from a voltage divider network and having a common output in a summing circuit to produce a sine wave at a predetermined frequency. The multiplexers are controlled by a single up/down counter element which drives the multiplexers to produce identical waveforms in each of the four quadrants of the sine wave. The sine wave frequency can be controlled by controlling a signal provided to the up/down counter.
|
