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參數(shù)資料
| 型號： | PMB2402 |
| 廠商： | SIEMENS AG |
| 英文描述： | GSM Receiver Circuit |
| 中文描述： | 手機(jī)接收電路 |
| 文件頁數(shù)： | 5/21頁 |
| 文件大?。?/td> | 697K |
| 代理商： | PMB2402 |
Semiconductor Group
5
PMB 2402
Circuit Description
The input signal SI/SI and the amplified first local oscillator signal LO1/LO1 are mixed down to an
intermediate frequency (IF). The open collector output of the mixer generates a differential current
at pins MO/MO which is filtered by an external resonant circuit. The resulting voltage drives an
external SAW-filter.
The second local oscillator signal LO2 is generated in an on chip VCO and is fed to two dividers,
which generate orthogonal signals at a quarter of VCO-frequency. The internal LO-signal is fed to
an additionally divider, whose output signal LO2O is fed to the RF-signal of PLL-synthesizer. The
filtered IF-signal reenters the chip at the IFI/IFI input, where it is amplified and demodulated to the
final baseband output frequency with each of the orthogonal signals. The resulting in-phase and
quadrature signals pass through differential output drivers and appear at SOI/SOI and SOQ/SOQ
outputs, respectively. The amplification of the IF-signal before the second mixer stage is performed
by a gain-controlled amplifier, the gain being determined by the voltage at the gain control input GC.
Two differential operational amplifiers with the input signals INI/INI (INQ/INQ) and the output signals
OUTI/OUTI (OUTQ/OUTQ) can be used as active filters.
Differential signals and symmetrical circuitry are used throughout, except at the signal output. Bias
drivers generate internal temperature- and supply voltage-compensated reference voltages
required by various circuit blocks. Switching the power down inputs PD1 and PD2 from high to low
(
see table
) sets the circuit from its normal operating mode into a mode with reduced supply current.
PD1
PD2
RF-Part
IF-Part
VCO/Divders
L
L
OFF
OFF
ON
L
H
OFF
ON
ON
H
L
ON
OFF
ON
H
H
ON
ON
ON
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相關(guān)代理商/技術(shù)參數(shù) |
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| PMB2402S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Demodulator， Other/Special/Miscellaneous |
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| PMB2407 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:GSM Receiver PCN/PCS Receiver |
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