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特性

• RF 频率范围：24 GHz 至 29.5 GHz，将 n257、n258 和 n261 频段集成在一个空间内
• 16 个可选的 TX 通道
• 16 个可选的 RX 通道
• 水平和垂直极化
• 匹配的 50Ω 单端 RF 输入和输出
• 通过高分辨率矢量调制器实现相位控制
• 通过高分辨率 DGA 实现幅度控制
• 温度补偿
• 通过存储器存储 TX 和 RX 波束位置
• 工作温度高达 95°C
• 符合 3GPP 规范

产品详情和应用

The ADMV4821 is a silicon germanium (SiGe), 24 GHz millimeterwave (mmW) to 29.5 GHz mmW 5G beamformer. The RF IC is highly integrated and contains 16 independent channels with both transmit and receive functionality. The ADMV4821 supports eight horizontal and eight vertical polarized antennas via the independent RFV and RFH inputs/outputs common pins.

In transmit mode, both the RFV and RFH input signals are split via two independent 1:8 power splitters and pass through the eight, independent, corresponding transmit channels. In this mode, each channel includes a vector modulator (VM) to control the phase and two digital variable gain amplifiers (DVGAs) to control the amplitude.

In receive mode, input signals pass through two sets of eight receive channels (either vertical or horizontal) and are combined via one independent 8:1 combiner connected to the RFV pin and one independent 8:1 combiner connected to the RFH pin. In this mode, each channel includes a VM to control the phase and a DVGA to control the amplitude.

The VM provides a full 360° phase adjustment range in either transmit or receive mode. The VM provides six bits of resolution for 5.625° phase steps.

In transmit mode, the total DVGA dynamic range adjustment range is 32.4 dB. The DVGAs provide five bits or six bits of resolution, resulting in 1.0 dB or 0.5 dB amplitude steps, respectively.

In receive mode, the DVGA allows for 17.1 dB of dynamic range adjustment. The DVGA also provides six bits of resolution, resulting in 0.5 dB amplitude steps. The DVGAs provide a flat phase response across the full gain range.

The transmitter channels contain individual power detectors to detect and calibrate the gain for each channel as well as the channel to channel gain mismatch. Directly connect the ADMV4821 RF ports to a patch antenna to create a dual polarization mmW 5G subarray.

Users can program the ADMV4821 by