2.3.3
VSAT, 2-way communication via satellite
Design a Ku-/ Ka-band VSAT transceiver that meets IESS-308
with NXP's Ku-/ Ka-band RF LO generators
The TFF100xHN family are Ku-band RF PLLs, with integrated VCO intended for low phase-noise local-
oscillator (LO) circuits in Ku- & Ka-band VSAT transmitters and transceivers. Manufactured in a high-
performance SiGe:C process, these devices deliver extremely low phase noise and comply with the IESS-308
from Intelsat.
VSAT networks are commonly used to transmit narrowband
data, such as point-of-sale transactions for credit cards, or to
transmit broadband data that supports satellite Internet access
to a remote location, VoIP, or video.
The network typically consists of a dish antenna, an outdoor
unit, and an indoor unit. The outdoor unit is used for
frequency translation between RF and IF, and usually includes
a microwave-based uplink/downlink separator, a low noise
block (LNB) for receiving the downlink signals, and a block
Upconverter (BUC).
The VSAT ICs can be used to create the LO generator for a
linear BUC (meaning the IF or RF conversion is done by mixing
with an LO).
Features
`
Phase noise compliant with IESS-308 (Intelsat)
`
Differential input and output
`
Divider settings at 16, 32, 64, 128, or 256
`
Lock-detect output
`
SiGe:C technology (120 GHz f
T
process)
`
HVQFN24 (SOT616-1) package
Applications
`
VSAT block upconverters
`
VSAT down conversion
`
Local oscillator signal generation
To enable precise frequency and time multiplexing, the
downlink signal provides an accurate frequency reference of
10 MHz. The indoor unit frequency multiplexes this with the
uplink IF signal, and the LO signal in the BUC needs to be
frequency-locked to the reference.
The TFF100xHN ICs are housed in a 24-pin HVQFN (SOT616-1)
package. The pins have been assigned for optimal performance.
Three voltage domains are used to separate the block on the
IC, and two pins for each output (OUT-P and OUT-N) have been
reserved to match a typical layout using a linewidth of Z = 50 Ω
microstrip on a 20-mil RO4003 board (1.1 mm).
The ground pins have been placed next to the reference input
and the output, and, to minimize crossings in the application,
all the supply pins are on the same side of the IC.
58
NXP Semiconductors RF Manual 16
th
edition
PHILIPS [ NXP SEMICONDUCTORS ]
