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參數(shù)資料
| 型號： | S1L9225 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | RF AMP & SERVO SIGNAL PROCESSOR |
| 中文描述： | 射頻放大器 |
| 文件頁數(shù)： | 52/60頁 |
| 文件大?。?/td> | 623K |
| 代理商： | S1L9225 |
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S1L9225X
RF AMP & SERVO SIGNAL PROCESSOR
52
RF EQUALIZE & AGC
Modulator
3x Gain AMP
HPF
(3dB: 50kHz)
I/V Converter
Control Range
I * 10K
Full Wave Rectifier
(RF Peak Envelope)
Iout = 2gm (Vid/2)
= gm * Vid
= (Iref) * (Vid/Vt)
= Iref * (Vp-Vn)/Vt
if Vn > Vp
Vcagc Increment (tanh (1-X))
if Vn < Vp
Vcagc Decrement (tanh (1+X))
tanh
±
0.1 =
±
0.1
tanh
±
0.5 =
±
0.462
tanh
±
0.1 =
±
0.7
tanh
±
2.0 =
±
0.964
Vref
Vp
Vn
V = I/C (115pF)
EQO-AGC Output
Vin (t)
Vcagc (t)
Vo (t)
+
-
Vin(t) = 0.73x (RFO)
Vo(t) =
R6 (5.5K)
(
2Vt
Vcagc(t)
)
The modulator output, which had the Veqc's Tanh term multiplied at the input, passes through the approximately
3X gain terminal to the ARF pad. On the one hand, the output is - rectified as it passes through the HPF having
50kHz pole frequency and follows the peak envelope the RF level. At this time, the pole frequency of the HPF is
set to 50kHz so that the 3T - 11T component can pass through without attenuation. The RF level peak value is
integrated at the 's CAP node after wave rectification. If this peak value is less than the already set voltage
comparison, sinking current is output and, if not, sourcing current is output. The maximum peak value at this time
is 10uA, which is I/V converted and applied as the modulator control voltage. Under the sinking condition, the
Vcagc increases to 1outx10K and multiplied by Tanh (1-X); the sourcing condition, Vcagc decreases to Iout x10K
and multiplied by Tanh (1+X), where X is (Veqc/2Vt).
Overall, after detecting the 3T and 11T levels by full-wave rectification, it is compared to Tanh using the
modulator and multiplied to the gain to realize the wave-form equalize. The above is related to the AGC concept,
which means that a specific RF level is always taken
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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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| S1L9225X | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:RF AMP & SERVO SIGNAL PROCESSOR |
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