| 摘要 |
<p>A ramp generator includes a resistance ladder (10) supplied with a constant current. Switches (S) are closed in sequence by a shift register (14) to provide a stepped ramp out put (Vout). In preferred forms, the constant current to the resistance ladder (10) is controlled by reference to an on-chip bandgap voltage (Vbg) which is used as an input to a feedback circuit controlling current through a reference resistor ladder (18). <IMAGE></p> |
