| 摘要 |
<p>A voltage mode digital-to-analog converter (DAC) with an output buffer operational amplifier (A2) is provided with a rail-to-rail output voltage capability by reducing the DAC's output voltage swing to a range that is within the amplifier's permissible input signal range, and connecting the amplifier (A2) in a multiplier configuration to produce a corresponding multiplication of its input signal. The DAC output reduction is preferably achieved by delivering an n-bit input digital signal to an n+m bit DAC (DAC2), and holding the DAC's m most significant bits OFF. The m most significant bits are dummy bits that are impedance matched with the DAC, while the amplifier is an operational amplifier (A2) with a feedback circuit that is also impedance matched to the DAC.</p> |
