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參數(shù)資料
| 型號： | 9763-11 |
| 廠商： | PEREGRINE SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | 3.2 GHz Delta-Sigma modulated Fractional-N Frequency Synthesizer for Low Phase Noise Applications |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, CQCC68 |
| 封裝： | CERAMIC, QFJ-68 |
| 文件頁數(shù)： | 4/15頁 |
| 文件大?。?/td> | 351K |
| 代理商： | 9763-11 |
Product Specification
PE9763
Page 12 of 15
2003-2006 Peregrine Semiconductor Corp. All rights reserved.
Document No. 70-0140-02
│ UltraCMOS RFIC Solutions
Figure 5. Typical Phase Noise
Phase Detector and Charge Pump
The phase detector is triggered by rising edges
from the main Counter (fp) and the reference
counter (fc). It has two outputs, namely PD_U,
and PD_D. If the divided VCO leads the divided
reference in phase or frequency (fp leads fc),
PD_D pulses “l(fā)ow”. If the divided reference leads
the divided VCO in phase or frequency (fc leads
fp), PD_U pulses “l(fā)ow”. The width of either pulse
is directly proportional to phase offset between the
two input signals, fp and fc.
For the UP and DOWN mode, PD_U and PD_D
drive an active loop filter which controls the VCO
tune voltage. The phase detector gain is equal to
VDD / 2
п.
PD_U pulses cause an increase in VCO fre-
quency and PD_D pulses cause a decrease in
VCO frequency, for a positive Kv VCO.
For the charge pump mode, the phase detector
outputs are used internally to drive a tri-state
charge pump. However, the PD_U, and PD_D out-
put pins will be drive statically to GND. The
charge pump will drive a fixed 2 mA of current.
A lock detect output, LD is also provided, via the
pin Cext. Cext is the logical “NAND” of PD_
U and
PD_
D waveforms, which is driven through a series
2 k
resistor. Connecting Cext to an external
shunt capacitor provides low pass filtering of this
signal. Cext also drives the input of an internal in-
verting comparator with an open drain output.
Thus LD is an “AND” function of PD_
U and PD_D.
A typical phase noise plot is shown below. Phase noise results for “Trace 2” is the average values.
Test Conditions: Fout = 1.9202 GHz, Fcomparison = 20 MHz, MASH 1-1, VDD = 3 V, Temp = 25 C,
Loop bandwidth = 80 KHz.
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