Design of frequency converter based on RFFC2071

Purpose

Combined with RFMD's latest highly integrated, high linearity IC RFFC2071 (including broadband VCO, PLL and frequency converter) and other various device products, we provide customers with the best design solutions and shorten the R&D cycle so as to better serve customers.

Application

It is mainly used in indoor and outdoor coverage repeaters and other frequency conversion applications in the communication market.

Advantages

It has the characteristics of low power consumption, small size, simple application, and good performance indicators, including linearity, phase noise, etc.

Technical index requirements

1. Port Characteristics

• Power supply 5V

• Input RFIN, IFIN

• Output IFOUT, RFOUT

•Package size: 50*40*20mm (L*W*H)

2. RF Characteristics

•Input power: ≦-10dBm

•Gain: -5dB to +5dB

• Control lines DATE, CLK, ENX, ENABLE, MODE

• RF operating frequency band 30M-2700MHz

• VCO frequency range 85MHz-2700MHz

•Intermediate frequency SAW center frequency: 120MHz (70/140M optional), SAW delay ≦3μS

Basic principles:

The input signal is down-converted to 120MHz IF, amplified by IF, filtered by SAWF, amplified again, and up-converted to the same frequency as the input signal. If the IF frequency needs to be changed, it can be achieved by simply changing the SAWF and the local oscillator frequency. The schematic diagram is as follows:

Click on the image to see a larger version

In this design, the following RFMD devices will be used: RFFC2071: 1Pcs RFXF9503: 2Pcs RFXF8553: 1Pcs RFXF6553: 1Pcs SBB2089Z: 2Pcs.
Other key components: SAWF (120MHz) TCXO (26MHz) LDO (5V to 3V)

RFFC2071 basic block diagram:

RFFC2071 function introduction: Application range:
. LO frequency range: 85-2700MHZ. .CATV front end. Fractional frequency division..Digital TV repeater. Frequency step: 1.5Hz. .Mobile repeater. Fully integrated low phase noise LO and LO buffer amplifier. .WiMax/LTE . High linearity RF converter..Satellite communication. Converter frequency range: 30-2700MHz. .Point to point communication. High IIP3 (+23dBm). .Software radio. Converter bias adjustable to meet low power applications..Frequency converter. Full duplex mode. . Supply voltage: 2.7V-3.3V. . Low current consumption. . 3 or 4-wire serial port programming interface. . Operating temperature: -400C-+85 0C

960MHz, input power: -20dBm Set Lo signal to 1080MHz, PLL bandwidth to 120K. Test results: output power is -16.52dBm, gain: +3.48dB

Phase noise test data:

The 900MHz test results are as follows:

2: 2GHz test data: Test conditions: Signal input from J1 port, frequency 2000MHz, input power: -20dBm

Set the Lo signal to 2120MHz, the PLL bandwidth to 120K. Test results: output power is -22.99dBm, gain: -2.99dB

Phase noise test data: