原标题：ADI ADMV4530Ka频段卫星通信上变频器解决方案

　　ADI公司的ADMV4530是高度集成的上变频器,非常适合下一代Ka频段卫星通信的混频器.RF输出频传范围27GHz到31GHz,有两种上变换模式:差分基带I/Q(I/Q模式)直接上变换;单个上边带上变换(IF模式),1dB带宽为500MHz(I/Q模式),输入频率范围2GHz到3GHz(IF模式).可以使用一个 4 线串行端口接口 (SPI) 对该芯片进行编程.利用 SDP-S 控制器,用户可以通过 ADI 公司的分析控制评估 (ACE) 软件来连接 ADMV4530 SPI.主要用在卫星通信和点对点微波通信.本文介绍了ADMV4530主要特性,功能框图,以及评估板ADMV4530IQ-EVALZ/ADMV4530IF-EVALZE主要特性,ADMV4530IQ-EVALZ材料清单,ADMV4530IQ-EVALZ电路图和ADMV4530IF-EVALZ E电路图,以及PCB设计图.

　　The ADMV4530 is a highly integrated upconverter with an inphase/quadrature (I/Q) mixer that is ideally suited for next generation Ka band satellite communications.

　　An integrated low phase noise, fractional-N phase-locked loop (PLL) with a voltage controlled oscillator (VCO) and internal 2× multiplier generate the necessary on-chip local oscillator (LO) signal for the I/Q mixer, eliminating the need for external frequency synthesis. The VCO uses an internal autocalibration routine that allows the PLL to select the necessary settings and locks in approximately 100 μs.

　　The single-ended reference input to the PLL operates up to 500 MHz and features internal reference dividers and a multiplier for added flexibility. Additionally, the phase frequency detector (PFD) comparison frequency can be up to 250 MHz for integer mode and 160 MHz for fraction-N mode.

　　The upconverter consists of an I/Q mixer that can operate in either I/Q mode with 500 MHz of bandwidth or in IF mode up to 3 GHz of bandwidth, which allows various radio architectures and backward compatibility with legacy systems.

　　Immediately following the I/Q mixer are stages of gain and variable attenuation. The configuration can achieve a minimum 1 dB compression point (P1dB) compression point of 19 dBm, eliminating the need for external stages of gain.

　　A programmable 4-wire serial port interface (SPI) allows adjustment of the quadrature phase for optimum sideband suppression. In addition, the SPI allows nulling of LO feedthrough in IF mode. In I/Q mode, the LO feedthrough can be nulled by applying external dc offset to the differential baseband I/Q inputs.

　　An IF automatic gain control (AGC) adjusts the IF variable gain amplifier (VGA) to compensate for input power variations. During normal operation, this AGC feature can be enabled or disabled via the SPI. When disabled during normal operation, the AGC feature only works on a test tone during power-down mode to track temperature variations.

　　The ADMV4530 upconverter comes in a RoHs compliant, 6 mm × 6 mm, 40-terminal land grid array (LGA) package. The ADMV4530 operates over the −40℃ to +85℃ case temperature range.

　　ADMV4530主要特性:

　　RF output frequency range: 27 GHz to 31 GHz

　　Two upconversion modes

　　Direct upconversion from differential baseband I/Q (I/Q mode)

　　Single upper sideband upconversion (IF mode)

　　1 dB bandwidth: 500 MHz (I/Q mode)

　　Input frequency range: 2 GHz to 3 GHz (IF mode)

　　Matched, 50 Ω, single-ended RF output

　　Matched, 50 Ω, single-ended IF input

　　Programmable baseband I/Q common mode-voltage

　　Sideband rejection and carrier feedthrough optimization

　　Combined RF and IF gain dynamic range: 70 dB

　　Programmable automatic IF gain control

　　Programmable via 3-wire or 4-wire SPI

　　40-terminal, 6 mm × 6 mm, RoHS compliant LGA

　　ADMV4530应用:

　　Satellite communication

　　Point to point microwave communication

　　图1.ADMV4530功能框图

　　评估板ADMV4530IQ-EVALZ/ADMV4530IF-EVALZ E

　　The ADMV4530IQ-EVALZ and the ADMV4530IF-EVALZ are the two evaluation boards available for the ADMV4530 that work in inphase/quadrature (I/Q) mode and intermediate frequency (IF) mode, respectively. Both boards incorporate the ADMV4530 Ka band upconverter with low dropout (LDO) regulators and an interface to the EVAL-SDP-CS1Z (SDP-S) controller board to allow the simple and efficient evaluation of the ADMV4530. The on-board LDO regulators allow the ADMV4530 to be powered on by a single supply. The ADMV4530 is a highly integrated upconverter with an I/Q mixer that is ideally suited for next generation Ka band satellite communications. The chip can be programmed using a 4-wire serial port interface (SPI). The SDP-S controller allows the user to interface with the ADMV4530 SPI through the Analog Devices, Inc., Analysis, Control Evaluation (ACE) software.

　　For full details on the ADMV4530, see the ADMV4530 data sheet, which must be consulted in conjunction with this user guide when using the ADMV4530IQ-EVALZ and the ADMV4530IF-EVALZ.

　　评估板ADMV4530IQ-EVALZ/ADMV4530IF-EVALZ E主要特性:

　　Fully featured evaluation board for the ADMV4530

　　On-board system demonstration platform (SDP-S) connector for SPI

　　5 V operation through LDO

　　ACE software interface for SPI control

　　图2.评估板ADMV4530IQ-EVALZ外形图

　　图3.评估板ADMV4530IF-EVALZ外形图

　　图4.评估板ADMV4530IQ-EVALZ I/Q模式建立图

　　图5.评估板ADMV4530IF-EVALZ I/F模式建立图

　　图6.评估板ADMV4530IQ-EVALZ电路图(1)

　　图7.评估板ADMV4530IQ-EVALZ电路图(2)