3.3 V
1
3
2
OSCin
Vcc
100 MHz
@ +6 dBm
USB Cable
Phase Noise
Analyzer
Power
Supply
Sig Gen
4
RFout
U
S
B2
A
N
Y
1
0
p
in
r
ib
b
o
n
cab
le
Laptop or PC
Chapter 1
SNAU194 – December 2015
Evaluation Board Setup
Figure 1-1. Setup Diagram
1. Power:
(a) Set power supply to 3.3 V with 500-mA current limit.
(b) Connect V
CC
with SMA cable or clip to test point V
CC_TP
.
2. Input Signal
(a) Option 1 (default): The on-board Oscillator is powered on and outputs 100-MHz signal to OSCinP
(pin 8) of the device input.
(b) Option 2: MUST switch R14p to R14, which routes the input signal from the OSCinP SMA
connector instead of on-board Oscillator. Set a low phase noise signal generator to 100 MHz with
6-dBm power level. Connect to OSCinP or OSCinM if you have a single-ended signal. Connect to
both if you have a differential signal.
NOTE:
Phase noise of input signal should be below –150 dBc/Hz at 10-kHz offset for 100-MHz
signal, otherwise the input reference noise will dominate the in-band phase noise at RF
output. The On-board Oscillator is only at –134 dBc/Hz.
3
SNAU194 – December 2015
Evaluation Board Setup
Copyright © 2015, Texas Instruments Incorporated
