ADI ADL5336带可编RMS检测器的IF VGA解决方案
ADI公司的ADL5336是带可编RMS检测器的中频(IF)可编增益放大器( VGA),具有dB线性增益控制,工作频率从低频到1GHz,VGA和AGC工作模式,连续增益控制范围48dB,最大增益时的噪音(NF)为6.8dB,1.0V输出时的IMD3大于62dBc,单电源5V工作,主要用在点对多点无线电,仪表和医疗电子.本文介绍了方框图,VGA1和VGA2功能框图, 基本连接电路图以及评估板电路图,材料清单和元件布局图.
ADL5336 : Cascadable IF VGAs with Programmable RMS Detectors
The ADL5336 consists of a pair of variable gain amplifiers (VGAs) designed for cascaded IF applications. The amplifiers have linear-in-dB gain control and operate from low frequencies to 1 GHz. Their excellent gain conformance over the control range and flatness over frequency are due to Analog Devices, Inc., patented X-AMP® architecture, an innovative technique for implementing high performance variable gain control.
Each VGA has 24 dB of gain control range. Their maximum gain can be independently programmable over a 6 dB range via the SPI. The VGAs can be cascaded to provide a total range of 48 dB. When connected to a 50 Ω source through a 1:4 balun, the gain is 6 dB higher. The second VGA has an SPI programmable input switch that selects one of two external inputs.
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