TX Digital VGA
450MHz to 1100MHz
F1451
Datasheet
Description
The F1451 is a High Gain / High Linearity 450MHz to 1100MHz TX
Digital Variable Gain Amplifier used in transmitter applications.
The F1451 TX DVGA provides 32dB maximum gain with +41.5dBm
OIP3 and 3.6dB noise figure. Up to 29.5dB gain control is achieved
using the combination of a digital step attenuator (DSA) and a
KLINTM RF Digital Gain Amplifier. This device uses a single 5V
supply and 185mA of ICC.
This device is packaged in a 6 × 6 mm, 28-pin VFQFPN with 50Ω
single-ended RF input and RF output impedances for ease of
integration into the signal-path.
Competitive Advantage
In typical Base Stations, RF VGAs are used in the TX traffic paths
to drive the transmit power amplifier. The F1451 TX DVGA offers
very high reliability due to its construction from a monolithic silicon
die in a QFN package. The F1451 is configured to provide an
optimum balance of noise and linearity performance consisting of
a KLINTM RF amplifier, digital step attenuator (DSA) and a PA driver
amplifier. The KLINTM amplifier maintains the OIP3 and output P1dB
performance over an extended attenuation range when compared
to competitive devices.
Typical Applications
Multi-mode, Multi-carrier Transmitters
WiMAX and LTE Base Stations
UMTS/WCDMA 3G Base Stations
PHS/PAS Base Stations
Public Safety Infrastructure
Features
Broadband 450MHz to 1100MHz
32dB maximum gain
3.6dB NF at maximum gain (900MHz)
29.5dB total gain control range, 0.5dB step
< 2dB overshoot between gain transitions
Maintains flat +23dBm OP1dB for more than 13dB gain
adjustment range
Maintains flat +41dBm OIP3 for more than 15dB gain
adjustment range
SPI interface for DSA control
Single 5V supply voltage
ICC = 185mA
Up to +105°C TCASE operating temperature
50Ω input and output impedance
Standby mode for power savings
Pin compatible 2100MHz and 2700MHz versions
6 × 6 mm, 28-VFQFPN package
Block Diagram
Figure 1. Block Diagram
RF IN
KLIN
Constant
High LinearityTM
KLINTM DVGA
DSA
PA Driver
RF OUT
SPI &
Decoder
6 mm x 6 mm
28-pin
3
Digital CTL
Bias
/STBY
© 2020 Renesas Electronics Corporation
1
January 15, 2020
