| 摘要 |
A high speed x/sine(x) correction circuit for a digital to analog converter (DAC) functions by implementing a filter with an impulse response that approximates a sine(x)/x response. Each digital data value of an input signal to be converted by the DAC is considered a separate impulse. Each impulse, or initial pulse, is used to create a first reflection pulse by delaying the initial pulse by one clock cycle, inverting the delayed initial pulse and multiplying the delayed initial pulse by a constant less than one, such as dividing the delayed initial pulse by right-shifting the digital data value of the delayed initial pulse. The first reflection pulse is added to the input signal in the clock cycle it is generated prior to input to the DAC. A second reflection pulse may be generated in like manner from the first reflection pulse with an additional clock cycle delay for optimum results, both reflection pulses being added to the input signal in the clock cycle they are generated prior to input to the DAC.
|
