RF3866TR7 RFMD, RF3866TR7 Datasheet - Page 11

• Manufacturer Part Number: RF3866TR7
• Description: IC AMP LOW-NOISE 2-STAGE 20-QFN
• Manufacturer: RFMD

Specifications of RF3866TR7

• Current - Supply: 180mA ~ 220mA
• Frequency: 700MHz ~ 3.8GHz
• Gain: 20dB
• Noise Figure: 0.8dB
• P1db: 22dBm
• Package / Case: 20-QFN
• Rf Type: Cellular, CDMA, PCS, DCS, UMTS, WLAN, 802.16/WiMax
• Test Frequency: 3.3GHz ~ 3.8GHz
• Voltage - Supply: 2.5V ~ 6V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Again, start with the standard 700MHz to 1100MHz evaluation board and make the following changes:
• L3 adjusted from 18nH to 10nH
• L1 adjusted from 12nH to 27nH
• L2 adjusted from 8.2nH to 10nH
• “R5” adjusted from 6.8pF to 1.5pF
• “C8” adjusted from unpopulated to 150Ω
• C3 and C4 adjusted from 10pF to 15pF
Intuitive changes were made at L3 and R5. Lowering L3 extends input match higher in frequency. Lowering “R5” to 1.5pF
helps meet gain flatness specification by reducing gain on the low end of the band.
Non-intuitive changes:
• “C8” value of 150Ω optimized interstage match for gain flatness.
• L1/L2/C3/ C4 chosen via trial and error to further influence gain and meet return loss specification.
The above matching discussion should be helpful when considering use in frequency bands outside of those covered by stan-
dard evaluation boards. it can be noted here that application schematics and standard boards collectively cover 100% of the
usable bandwidth from 400MHz to 3800MHz. As such, choosing from these available schematics should accommodate the
majority of applications that come about.
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