2.3 TV and satellite
2.3.1
LNAs with programmable gain & bypass option for improved tuner performance
NXP LNAs BGU703x &BGU704x for TVs/STBs
Designed for high linearity and low noise, these 3.3 and 5 V wideband LNAs support multi-tuner applications
in TVs, DVR/PVRs, and STBs operating between 40 MHz and 1 GHZ. A unique programmable gain with
bypass mode compensates for tuner switch signal loss (important in multi-tuner systems), and improves
overall system performance by 7 to 10 dB.
Key features
Internally biased
Fixed G
p
= 10 dB: BGU7031 (5 V), BGU7041 (3.3 V), and
Fixed G
p
= 14 dB: BGU7044 (3.3 V)
Programmable between G
p
= 10 dB and
bypass: BGU7032 (5 V), BGU7042 (3.3 V), and programmable
between G
p
= 14 dB and bypass: BGU7045 (3.3 V)
Programmable between G
p
= 10 dB, 5 dB and bypass:
Flat gain between 40 MHz and 1 GHz
Output power at 1 dB gain compression (P
L(1 dB)
) ranging
from 9 to 14 dBm
Noise figure as low as 2.8 dB
High linearity with an OIP3 of 29 dBm
75 Ω input and output impedance
Power-down during bypass mode
ESD protection >2 kV HBM, >1.5 kV CDM on all pins
Key trends
Multiple tuners in TV, DVR/PVR, and set-top box
applications, requiring improved signal handling
Use of 3.3 V Si tuner ICs, perfect match with our 3.3 V LNAs
(BGU704x)
Applications
Terrestrial and cable set-top boxes (STBs)
Silicon and can tuners
Personal and digital video recorders (PVRs and DVRs)
Home networking and in-house signal distribution
NXP’s BGU703x and BGU704x low-noise amplifiers (LNAs)
upgrade overall picture quality with improved signal handling
(NF, dynamic range), while reducing the number of external
components.
Produced in NXP’s own QUBiC4+ Si BiCMOS process, they
improve signal handling by compensating for the signal loss at
the tuner switch. This can improve system performance by as
much as 7 to 10 dB.
The BGU7031, BGU7041, and BGU7044 are LNAs with fixed gain.
The BGU7032, BGU7042, and BGU7045 have an additional
bypass mode, and the BGU7033 adds two gain levels along
with the bypass mode. In bypass mode, the devices consume
less than 5 mA of current. Integrated biasing and 75 Ω
matching reduces footprint by eliminating as many as 15
components compared to discrete solutions.
All the devices can be used with discrete or Si can tuners, as
well as with on-board tuners. They deliver more robust ESD
performance compared to GaAs solutions, withstanding >2 kV
human body model (HBM) and >1.5 kV charged device model
(CDM).
BGU703x evaluation board
54
NXP Semiconductors RF Manual 16
th
edition
PHILIPS [ NXP SEMICONDUCTORS ]
