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AD831 Datasheet(PDF) 11 Page - Analog Devices |
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AD831 Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page AD831 REV. B –11– Single Supply Operation Figure 26 is similar to the dual supply circuit in Figure 19. Sup- plies may be as low as 9 V but should not be higher than 11 V due to power dissipation. As in Figure 19, both the RF and LO ports are driven single-ended and terminated. In single supply operation, the COM terminal is the “ground” reference for the output amplifier and must be biased to 1/2 the supply voltage, which is done by resistors R1 and R2. The OUT pin must be ac-coupled to the load. R1 110 Ω IF OUTPUT RT NC 0.1µF 0.1µF +9V 51.1 Ω 0.1µF +9V 0.1µF C2 L1 C1 RF INPUT 82pF 82pF 0.1µF +9V LO INPUT –10 dBm 5k Ω 5k Ω +5V R2 51.1 Ω CC 0.1µF 0.1µF IFN VP IFP AP GND VN RFP RFN VN VP LON LOP VP GND BIAS VN AD831 Top View 50 Ω 50 Ω 6 7 8 4 5 9 10 11 12 13 AN VFB COM OUT 14 15 16 17 18 1 2 3 19 20 Figure 26. Connections for +9 V Single-Supply Operation |
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