Monolithic RF Power Measurement System LT5504 Typical Application Circuit

Published:2011/5/11 4:30:00 Author:Sharon | Keyword: Monolithic, RF Power Measurement System, Typical Application | From:SeekIC

LT5504 typical application circuit is shown in the figure. RF signal passes through the coupling capacitor (C1) and 1:1 RF input transformer (T) to the LT5504 RF input. R1 is the shunt resistor. Crystal frequency is input to LO through terminal C5. Through the voltage divider R2 and R5, Uo end gets DC output voltage Uo. JP is the jumper. Since R4>> R3, when JP is connected, EN terminal raises the electrical level to make the circuit open. When JP is off,EN terminal drops the electrical level to close the circuit, and the chip gets into low power consumption mode. 1:1 RF input transformer's model number is 617DB-1022, which can also be replaced by the the narrow-band single-ended / differential conversion circuit constituted by three discrete components. The circuit is shownin the figureand the matching network's component values are listed in the table. According to different PCB design, the above-mentioned component values still need some adjustments.Voltage gain G of the narrow-band single-ended / differential conversion circuit is determined by below formula:



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