ADL5354高性能RF混频设计

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ADI 公司的ADL5354是高度线性双平衡(RF和LO平衡)RF混频器,输入频率从2300 MHz 到2900 MHz.平衡的无源混频器具有良好的LO-RF泄漏,优于-35dBm.IF频率范围从30MHz到450MHz,功率转换增益8dB,单边带(SSB) 噪音10dB,输入IP3为25dBm,输入P1为11dBm,LO典型驱动为0dBm.工作电压3.3V-5.0V,主要用在蜂窝无线基站接收器,无线链接下变换器等.本文介绍ADL5354主要特性,方框图以及典型应用,评估板电路图和元件配置表.
The ADL5354 uses a highly linear, doubly balanced, passive mixer core along with integrated RF and local oscillator (LO) balancing circuitry to allow single-ended operation. The ADL5354 incorporates the RF baluns, allowing for optimal performance over a 2300 MHz to 2900 MHz RF input frequency range. The balanced passive mixer arrangement provides good LO-to-RF leakage, typically better than −35 dBm, and excellent  intermodulation performance. The balanced mixer core also provides extremely high input linearity, allowing the device to be used in demanding cellular applications where in-band blocking signals may otherwise result in the degradation of dynamic performance. A high linearity IF buffer amplifier follows the passive mixer core to yield a typical power conversion gain of 8.2 dB and can be used with a wide range of output impedances.
The ADL5354 provides two switched LO paths that can be used in TDD applications where it is desirable to ping-pong between two local oscillators. LO current can be externally set using a resistor to minimize dc current commensurate with the desired level of performance. For low voltage applications, the ADL5354 is capable of operation at voltages down to 3.3 V with substantially reduced current. Under low voltage operation, an additional logic pin is provided to power down (<300 &mu;A) the circuit when desired.
The ADL5354 is fabricated using a BiCMOS high performance IC process. The device is available in a 6 mm × 6 mm, 36-lead LFCSP and operates over a &minus;40℃ to +85℃ temperature range.
ADL5354主要特性:
RF frequency range of 2300 MHz to 2900 MHz
IF frequency range of 30 MHz to 450 MHz
Power conversion gain: 8 dB
SSB noise figure of 10 dB
Input IP3 of 25 dBm
Input P1dB of 11 dBm
Typical LO drive of 0 dBm
Single-ended, 50 &Omega; RF and LO input ports
High isolation SPDT LO input switch
Single-supply operation: 3.3 V to 5 V
Exposed paddle, 6 mm × 6 mm, 36-lead LFCSP
ADL5354应用:
Cellular base station receivers
Transmit observation receivers
Radio link downconverters

图1.ADL5354功能方框图

图2.ADL5354典型应用电路图

图3.ADL5354评估板电路图

ADL5354评估板元件配置表:

图4.ADL5354评估板顶层布局图