參數(shù)資料
型號(hào)： 935268498518
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： PLL合成/DDS/VCOs
英文描述： PLL FREQUENCY SYNTHESIZER, 2500 MHz, PBCC24
封裝： 4 X 4 MM, 0.65 MM HEIGHT, PLASTIC, HBCC-24
文件頁(yè)數(shù)： 28/28頁(yè)
文件大?。?/td> 278K
代理商： 935268498518
Philips Semiconductors
Product data
SA8028
2.5 GHz sigma delta fractional-N /
760 MHz IF integer frequency synthesizers
2002 Feb 22
9
1.4
Phase detector (see Figure 6)
The reference signal and the RF (IF) divider output are connected to a phase frequency detector that controls the charge pumps. The dead
zone (caused by the finite time taken to switch the charge pump current sources on or off) is cancelled by forcing the pumps ON for a minimum
time (backlash time,
τ) at every cycle providing improved linearity.
SR02413
R
X
P
N
* see note
IF/RF
DIVIDER
D
Q
CLK
“1”
R
D
R
CLK
“1”
X
Q
N
P
τ
VDDCP
IPH
GNDCP
P–TYPE
CHARGE PUMP
N–TYPE
CHARGE PUMP
R
fREF
IPH
τ
NOTES:
For the RF synthesizer, the output of the reference input buffer is routed directly (not divided) to the input of the RF phase detector. Whereas
for the IF synthesizer, the reference input to the IF phase detector is the output from the reference divider.
τ (backlash time) is the delay that fixes the minimum allowable charge pump activity time.
Figure 6.
Phase detector structure with timing.
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