| 摘要 |
A color space converter is implemented using current mode analog circuitry to efficiently transform video data from a YCbCr format to an RGB format in order to allow the display of video signals on a color monitor. The analog current-mode circuitry is implemented in an integrated circuit that will operate at high clock rates and can be integrated in a small die area so as to reduce its cost. The color space converter includes Y, Cb and Cr current-mode conversion circuits to compute Y, Cb and Cr contributions to the G, R and B signals, and current-mode adders that add those contributions to the G, R and B signals to generate the G, R and B signals. Each conversion circuit includes (A) a respective folded cascode structure having an input coupled to a respective analog Y, Cb or Cr signal, each conversion circuit generating a respective Y, Cb or Cr current output; (B) at least one respective current mirror that generates from the Y, Cb or Cr current output an unadjusted Y, Cb or Cr contribution to at least one of the G, R and B signals, and (C) at least one current adder for subtracting respective offset currents from the unadjusted Y, Cb or Cr contribution to at least one of the G, R and B signals to provide the Y, Cb or Cr contribution to at least one of the G, R and B signals.
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