| 摘要 |
A continuous-time delta-sigma modulator has an SC(SCR) feedback DA (103) for improving the jitter tolerance of clocks (CLK). The delta-sigma modulator is not affected by any manufacture process variations, operational temperature conditions and so on and exhibits a stable operation by maintaining a constant feedback amount. A reference voltage (Vref), which decides an output voltage of the SC feedback DA (103), is adjusted, whereby a constant amount of charge can be fed back from the SC feedback DA (103) to a loop filter (101). This stabilizes the operation of the delta-sigma modulator. ® KIPO & WIPO 2009
|
