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參數(shù)資料
| 型號： | STW81100AT |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | MULTI-BAND RF FREQUENCY SYNTHESIZER WITH INTEGRATED VCOS |
| 中文描述： | 多波段射頻頻率合成器帶有集成的VCO |
| 文件頁數(shù)： | 13/23頁 |
| 文件大?。?/td> | 915K |
| 代理商： | STW81100AT |
13/23
STW81100
7.8 Voltage Controlled Oscillators
7.8.1 VCO Selection
Within STW81100 two low-noise VCOs are integrated to cover a wide band from 3280MHz to 4400MHz
(direct output), from 1640MHz to 2200MHz (selecting divider by 2) and from 820MHz to 1100MHz (select-
ing divider by 4).
VCO A frequency range 3280MHz-3900MHz
VCO B frequency range 3800MHz-4400MHz
7.8.2 VCO Frequency Calibration
Both VCOs can operate on 32 frequency ranges that are selected by adding or subtracting capacitors to
the resonator. These frequency ranges are intended to cover the wide band of operation and compensate
for process variation on the VCO center frequency.
An automatic selection of the range is performed when the bit SERCAL rises from “0” to “1”. The charge
pump is inhibited and the pins ICP & VCTRL are at VDD/2 volts.
Then the ranges are tested to select the one which with this VCO input voltage is the nearest to the desired
output frequency (Fout = N*Fref/R). When this selection is achieved the signal ENDCALB (which means
End of Calibration) falls to “0”, then the charge pump is enabled again and SERCAL should be reset to “0”
before the next channel step.
The PLL has just to perform fine adjustment around VDD/2 on the loop filter to reach Fout, which enables
a fast settle.
Figure 16. VCO Sub-Bands Frequency Characteristics
The SERCAL bit should be set to “1” at each division ratio change. It should be noted that in order to reset
the autocalibrator State Machine after a power-up, and anyway before the first calibration, the INITCAL bit
should be set to “1” and back to “0” (this operation is automatically performed by the Power On Reset cir-
cuitry). The calibration takes approximately 7 periods of the Comparison Frequency.
The maximum allowed f
comp
to perform the calibration process is 1 MHz. Using an higher f
comp
the follow-
ing procedure should be adopted:
1.
Calibrate the VCO at the desired frequency with an f
comp
less than 1 MHz
2.
Set the A, B and R dividers ratio for the desired f
comp
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| STW81100AT-1 | 功能描述:鎖相環(huán) - PLL MULTI BAND RF FREQ SYNTHESIZER RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| STW81100ATR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:MULTI-BAND RF FREQUENCY SYNTHESIZER WITH INTEGRATED VCOS |
| STW81100ATR-1 | 功能描述:鎖相環(huán) - PLL MULTI BAND RF FREQ SYNTHESIZER RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| STW81101 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multi-band RF frequency synthesizer with integrated VCOs |
| STW81101_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multi-band RF frequency synthesizer with integrated VCOs |
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