ST STW82100B 1850-2400 MHz下变换解决方案

ST公司的 STW82100B是RF（ 1850 - 2400 MHz）的下变换器，可提供8dB的增益，10.5 dB NF以及非常高的输入线性，IIP3可高达 +25.5 dBm，中频（IF）放大器的频率范围从70MHz到400MHz，适用于蜂窝设备的Rx和Tx。本文介绍了STW82100B主要特性，方框图，以及多种工作模式和典型应用电路图。

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

图1。STW82100B方框图

图2。STW82100B参考频率输入缓冲器

图3。STW82100B标准模式工作框图

图4。STW82100B采用相同LO频率的多模式工作框图

图5。STW82100B采用不同LO频率的多模式工作框图

图6。STW82100B采用外接VCO的标准模式工作框图

图7。STW82100B采用相同LO频率的外接VCO多模式工作框图

图8。STW82100B典型应用电路图

应用电路材料清单：

详情请见：
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00295270.pdf