1 Features
• Differential-to-single-ended (D2S) RF amplifier
• Near-DC to 8GHz
• Gain: 15.5dB at 2GHz
• OP1dB:
– 2GHz: 12dBm
– 6GHz: 10dBm
• OIP3:
– 2GHz: 28dBm
– 6GHz: 28.5dBm
• Noise figure (NF) and input noise spectral density:
– 2GHz: 11dB and –163dBm/Hz
– 6GHz: 11.5dB and –162.5dBm/Hz
• HD2 and HD3:
– HD2 (1GHz): –60dBc at 2dBm
– HD3 (1GHz): –58dBc at 2dBm
• Additive (residual) phase noise:
– 1GHz: –154.6dBc/Hz at 10kHz offset
• Gain and phase imbalance: ±0.6dB and ±2º
• Differential input matched to 100Ω
• Single-ended output matched to 50Ω
• Power-down feature
• 5V supply
• Active current: 170mA

2 Applications
• Directly interfaces with RF DACs
• Aerospace and defense
• Phased array radar
• Military radios
• 4G and 5G wireless BTS
• Test and measurement
• Active probe

3 Description
The TRF1108 is a very high-performance, differentialto-
single-ended (D2S) amplifier optimized for radiofrequency
(RF) applications. The device is an
excellent choice for applications that require a D2S
conversion at the output of digital-to-analog converter
(DAC) such as the high-performance DAC39RF10
or AFE7950. The on-chip matching components
simplify printed-circuit-board (PCB) implementation
and provide the highest performance over the usable
bandwidth. The device is fabricated using Texas
Instruments’ advanced complementary BiCMOS
process and is available in a space-saving, WQFNFCRLF
2mm × 2mm package.
The primary use-case of the TRF1108 is in accoupled
applications, where the device operates using
a single, 5V supply with an internally set commonmode
voltage that simplifies biasing. With the help of
an application circuit to set the input common-mode
voltage, and by using dual supplies, the amplifier can
be dc-coupled. A power-down feature is also available
for power savings.