基于ADL5354设计的高性能RF混频方案

ADL5354是ADI公司的高度线性双平衡(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 μA) 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 −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 Ω 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