MPhil thesis of Lo Chi Wa - Department of Electronic & Computer ...
MPhil thesis of Lo Chi Wa - Department of Electronic & Computer ...
MPhil thesis of Lo Chi Wa - Department of Electronic & Computer ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
feedback path to prevent the problem <strong>of</strong> dead zone. A true-single-phase-logic D-typeflip-flop 16 , as shown in Fig. 42, is used because <strong>of</strong> the simple design. Since the input <strong>of</strong>the D-type flip-flop is always connected to high, the first stage <strong>of</strong> the true-single-phaselogicD-type flip-flop is omitted. A chain <strong>of</strong> inverters is used to generate a pair <strong>of</strong>matched differential signals to drive the differential inputs <strong>of</strong> the current steering chargepumps.DQBClk ClrDQBClk ClrFig. 41 Schematic <strong>of</strong> frequency phase detectorclkQBresetclkFig. 42 Schematic <strong>of</strong> simplified TSPL D F/F55