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| ADI ADL5375/82宽带无线基站方案 | |||||
作者：ADI 文章来源：ADI 点击数： 更新时间：2008-1-9  |
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1．400 MHz to 6 GHz Broadband Quadrature Modulator ADL5375  The ADL5375 is a broadband quadrature modulator designed for operation from 400 MHz to 6 GHz. Its excellent phase accuracy and amplitude balance enable high performance intermediate frequency or direct radio frequency modulation for communications systems. The ADL5375 provides a greater than 500 MHz, 3 dB baseband bandwidth, making it ideally suited for use in broadband zero IF or low IF-to-RF applications and in broadband digital predistortion transmitters. In addition, the ADL5375 offers output gain flatness of ±0.5 dB from 450 MHz to 3 GHz and a broadband output return loss of less than −15 dB. The ADL5375 accepts two differential baseband inputs and a single-ended LO and generates a single-ended 50 Ω output. Two versions offer input baseband bias levels of 500 mV (ADL5375-05) and 1.5 V (ADL5375-15). The ADL5375 is fabricated using an advanced silicongermanium bipolar process. It is available in a 24-lead, exposedpaddle, Pb-free, LFCSP_VQ package. Performance is specified over a −40°C to +85°C temperature range. A Pb-free evaluation board is ADL5375主要特性： Output frequency range: 400 MHz to 6 GHz Modulation bandwidth: 500 MHz (3 dB) 1 dB output compression: ≥ 9.4 dBm from 500 MHz to 4 GHz Output return loss: ≤ 15 dB from 500 MHz to 5 GHz Noise floor: −161 dBm/Hz @ 900 MHz SB suppression: ≤ −40 dBc, 450 MHz to 4 GHz and vs. temp LO leakage: ≤ −40 dBm, 450 MHz to 2 GHz and vs. temp Baseband bias levels of 500 mV and 1.5 V Single supply: 4.75 V to 5.25 V 24-lead LFCSP_VQ package ADL5375应用： Cellular communications systems GSM/EDGE, CDMA2000, WCDMA, TDSCDMA WiMAX/broadband wireless access systems Multi-band, Multi-standard radios Satellite modems  图1。ADL5375功能方框图  图2。ADL5375评估板电路图 2．700 to 2700MHz Quadrature Demodulator ADL5382 The ADL5382 is a high performance quadrature I-Q demodulator that covers an RF input frequency range from 700 MHz to 2.7 GHz. With a NF = 14dB, IP1dB = 13dBm and IIP3 = 30dBm, the demodulator offers outstanding dynamic range suitable for the demanding infrastructure direct-conversion requirements. The differential RF inputs provide a well-behaved broad-band input impedance of 50Ω and should be driven from a 1:1 balun for best performance. Excellent quadrature accuracy is achieved using on-chip poly-phase filters for LO quadrature generation. Over a wide range of local oscillator (LO) levels, excellent demodulation accuracy is achieved with phase and amplitude balances < 0.25 dB and < 0.5o, respectively. The demodulated in-phase (I) and quadrature (Q) differential outputs are fully buffered. The ADL5382 provides voltage conversion gain of 5dB independent of differential load impedances that can be as low as 100 Ω with a drive capability exceeding 2Vpp in to 200 Ω. The fully balanced design minimizes effects from 2nd order distortion. The leakage from the LO port to the RF port is <-60dBc. Differential DC-offsets at the I and Q outputs are <10mV. Both of these factors contribute to the excellent IIP2 of >60dBm. The ADL5382 operates off a 4.75V to 5.25V supply. The supply current is programmable with an external resistor from the BIAS pin to ground. The ADL5382 is fabricated using Analog Devices’ advanced Silicon-Germanium bipolar process and is available in a 24-lead exposed paddle LFCSP package. Performance is specified over a -40oC to +85oC temperature range. ADL5382主要特性： I/Q Demodulator Operating RF frequency 700 MHz to 2700MHz IIP3 +30 dBm IIP2 +60dBm Input P1dB +13dBm NF 14 dB @ 900MHz Voltage Conversion Gain of 5dB Quadrature demodulation accuracy Phase accuracy <0.5° Amplitude balance <0.25 dB LO Input –10 to +5 dBm Demodulation Bandwidth ~500 MHz I/Q Drive 2Vpk into 200Ω Programmable Power Consumption ADL5382主要应用： QAM/QPSK demodulator W-CDMA/CDMA/CDMA2000/GSM Point-to-(Multi)Point Radio WiMax  图3。ADL5382方框图  图4。ADL5382评估板电路图 |
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