參數(shù)資料
型號： PMB2240
廠商： SIEMENS A G
元件分類： 無繩電話/電話
英文描述： GSM-Transmitter
中文描述： TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PQFP48
封裝： PLASTIC, TQFP-48
文件頁數(shù)： 8/31頁
文件大小： 1663K
代理商： PMB2240
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The reproduction, transmission or use of this document is not permitted without express written authority. Offenders will be liable for damages. All
rights, including rights created by patent grant or registration of a utility model or design, are reserved.
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The GSM transmitter PMB2240 contains a number of functions that have been realised with multiple
chips earlier:
- Oscillator signal input balanced or unbalanced
- RF-PLL prescaler
- IF-PLL dividers and phase detection
- TX - mixer
- I/Q modulator
The PMB2240 V1.6 is designed to be used with an external RF oscillator module. On chip this signal is
AC-coupled to an internal buffer stage. Therefore the RF input is suitable for symmetrical or single
ended use. There is no need for an external DC-bias of the RF input. The active parts of the IF
oscillator are located on the receive chip PMB2405.
A buffer BufRX, which can be powered down by pin PDBUFRX, is used to transmit the RF oscillator
signal to the receiver chip to drive the RF receive mixer. A special input buffer BufTX receives the IF
oscillator signal from the receive chip or an external source.
The RF oscillator signal is divided by the integrated 64/65 prescaler which can be connected to the
CMOS PLL circuit PMB2306 for the RF oscillator PLL. The supply pin VCCPR is a separate prescaler
supply, which openes the possilility to run the prescaler and the rest of the RF synthesizer on a supply
voltage that is different from the supplies of the rest of the chip.
For the IF-PLL the active oscillator structures on the PMB2405 or an external VCO module can be
used. The PMB2240 V1.6 contains the digital parts tor the IF oscillator PLL (fixed-PLL): the IF-
frequency and system clock dividers and a phase detector plus charge pump are integrated to lock the
IF oscillator to the external system clock. The oscillator signal drives the divider by 2 in front of the
transmit mixer. The phase locked IF- and RF- signals are converted into the transmit band (e.g. 880 -
915 MHz for GSM) by the TX- mixer. The mixer output signal leaves the chip at MO/MOX and passes
an external interstage filter to provide suppression of unwanted products. This signal reenters the chip
at the modulator input LO/LOX.
The LO signal is divided into two orthogonal carriers at the transmit frequency. The phase between the
two carriers can be fine-adjusted to 90 ° (orthogonality) by two external resistors at OFF1/OFF2 for
maximum SSB suppression. The modulator consists of two Gilbert multipliers, where the modulating
signals I(t) and Q(t) are multiplied with the RF-carriers. The outputs of both Gilbert cells are added and
amplified by a linear output stage. The modulated transmit signal is available at E/EX and is fed into a
transmitter power amplifier.
相關(guān)PDF資料
PDF描述
PMB2306 PLL-Frequency Synthesizer PMB2306R/PMB2306T Version 2.2
PMB2306R PLL-Frequency Synthesizer PMB2306R/PMB2306T Version 2.2
PMB2306T PLL-Frequency Synthesizer PMB2306R/PMB2306T Version 2.2
PMB2307 GSM Receiver PCN/PCS Receiver
PMB2405 GSM Receiver PCN/PCS Receiver
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PMB2251V1.3 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Phase-Locked Loop
PMB2302 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Serial-Input Frequency Synthesizer
PMB2303 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Serial-Input Frequency Synthesizer
PMB2304 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:PLL-FREQUENCY SYNTHESIZER
PMB2304R 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:PLL-FREQUENCY SYNTHESIZER
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