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ST公司的 STW82100B是RF（ 1850 - 2400 MHz）的下變換器，可提供8dB的增益，10.5 dB NF以及非常高的輸入線性，IIP3可高達 +25.5 dBm，中頻（IF）放大器的頻率范圍從70MHz到400MHz，適用于蜂窩設(shè)備的Rx和Tx。本文介紹了STW82100B主要特性，方框圖，以及多種工作模式和典型應用電路圖。 The STMicroelectronics STW82100B is an integrated down converter providing 8 dB of gain, 10.5 dB NF, and a very high input linearity by means of its passive mixer. Embedding two wide band auto calibrating VCOs and an integer-N synthesizer, the STW82100B is suitable for both Rx and Tx requirements for Cellular infrastructure equipment. The integrated RF balun and internal matching permit direct 50 ohm single-ended interface to RF port. The IF output is suitable for driving 200-ohm impedance filters.By embedding a DAC with dual current output to drive an external PIN diode attenuator, the STW82100B replaces several costly discrete components and offers a significant footprint reduction. The STW82100B device is designed with STMicroelectronics advanced 0.35 μm SiGe process. Its performance is specified over a -40℃ to +85℃ temperature range. STW82100B主要特性： ■ High linearity: – IIP3: +25.5 dBm – 2FRF-2FLO spurious rejection: 77 dBc ■ Noise figure: – NF: 10.5 dB ■ Conversion gain – CG: 8dB ■ RF range: 1850 MHz to 2400 MHz ■ Wide IF amplifier frequency range: 70 MHz to 400 MHz ■ Integrated RF balun with internal matching ■ Dual differential integrated VCOs with automatic center frequency calibration: – LOA: 1650 to 1950 MHz – LOB: 2050 to 2370 MHz ■ Embedded integer-N synthesizer – Dual modulus programmable prescaler (16/17 or 19/20) – Programmable reference frequency divider (10 bits) – Adjustable charge pump current – Digital lock detector – Excellent integrated phase noise – Fast lock time: 150 μs ■ Integrated DAC with dual current output ■ Supply: 3.3 V and 5 V analog,3.3 V Digital ■ Dual digital bus interface: SPI and I2C bus (fast mode) with 3 bit programmable address(1101A2A1A0) ■ Process: 0.35 μm BICMOS SiGe ■ Operating temperature range -40 to +85oC ■ 44-lead exposed pad VFQFPN package7x7x1.0 mm 
圖1。STW82100B方框圖
圖2。STW82100B參考頻率輸入緩沖器
圖3。STW82100B標準模式工作框圖
圖4。STW82100B采用相同LO頻率的多模式工作框圖
圖5。STW82100B采用不同LO頻率的多模式工作框圖
圖6。STW82100B采用外接VCO的標準模式工作框圖
圖7。STW82100B采用相同LO頻率的外接VCO多模式工作框圖
圖8。STW82100B典型應用電路圖 應用電路材料清單：
詳情請見： http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00295270.pdf |
