基于ADL5354設計的高性能RF混頻方案

ADL5354是ADI公司的高度線性雙平衡(RF和LO平衡)RF混頻器,輸入頻率從2300 MHz 到2900 MHz.平衡的無源混頻器具有良好的LO-RF泄漏,優于-35dBm.IF頻率范圍從30MHz到450MHz,功率轉換增益8dB,單邊帶(SSB)噪音10dB,輸入IP3為25dBm,輸入P1為11dBm,LO典型驅動為0dBm.工作電壓3.3V-5.0V,主要用在蜂窩無線基站接收器,無線鏈接下變換器等.本文介紹ADL5354主要特性,方框圖以及典型應用,評估板電路圖和元件配置表.

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應用:

Cellular base station receivers

Transmit observation receivers

Radio link downconverters


圖1.ADL5354功能方框圖

圖2.ADL5354典型應用電路圖

圖3.ADL5354評估板電路圖

ADL5354評估板元件配置表:


圖4.ADL5354評估板頂層布局圖