CDCFR83

DIRECT RAMBUS CLOCK GENERATOR

SCAS665B − APRIL 2001 REVISED OCTOBER 2005

9

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

CLK

CLKB

tc(3)

Cycle-to-cycle jitter = | tc(3) − tc(4)| over 10000 consecutive cycles

tc(4)

Figure 3. Short Term Cycle-to-Cycle Jitter Over Four Cycles

CLK

CLKB

tpd(1)

tc(5)

Duty cycle = (tpd(1)/tc(5))

Figure 4. Output Duty Cycle

CLK

CLKB

tpd(2)

tc(6)

Duty cycle error = tpd(2) − tpd(3)

tpd(3)

tc(7)

Figure 5. Duty Cycle Error (Cycle-to-Cycle)

CLK

CLKB

VO(X)+

VO(X), nom

VO(X)−

Figure 6. Crossing-Point Voltage

80%

tf

tr

20%

VOL

VOH

Figure 7. Voltage Waveforms