CML CMX994 100-600MHz直接变换接收解决方案
CML 公司的CMX994是 100-600MHz直接变换接收器，集成了高动态范围I/Q解调器控制增益的宽带LNA，接收器基带部分包括放大器和精密的基带滤波器，整数N PLL和VCO负阻放大器产生本地振荡（LO），工作电压3.3V，主要用在模拟/数字多模式无线电，SDR，数据遥测调制解调器，卫星通信，笛卡尔反馈回路发送器，宽带数据等。本文介绍了CMX994主要特性，方框图，典型应用框图和EV9942评估板主要特性与功能，电路图以及PCB布局图。
The CMX994 is a direct conversion receiver IC. It includes a broadband LNA with gain control followed by a high dynamic range I/Q demodulator. The receiver baseband section includes amplifiers and precise baseband filter stages. LO generation is provided by an integer-N PLL and a VCO negative resistance amplifier; an external LO may also be used. LO dividers are provided for flexible multi-band operation.
The device operates from a single 3.3V supply over a temperature range of –40℃ to +85℃ and is available in a small 40-pin VQFN (Q4) package.
CMX994主要特性：
Rx Direct Conversion Receiver
o Direct conversion eliminates image responses
o LNA with gain control
o 100MHz to 600MHz I/Q demodulator
o Precise filtering with bandwidth setting and 1:2:4 bandwidth modes Local Oscillator
o LO synthesiser
o VCO negative resistance amplifier
o LO divide by 2, 4 or 6 modes
o Tx LO Output
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