iC227
preliminar y
Rev B1, Page 1/22
DUAL 11 GHz SAMPLING OSCILLOSCOPE
FEATURES
o
o
o
o
o
Dual 11 GHz DC coupled inputs
50
Ω
inputs
Optically isolated full speed USB interface
Intuitive graphical PC software interface
Low cost
APPLICATIONS
o
High-Speed Sampling
Oscilloscope for periodic signals
BLOCK DIAGRAM
Copyright © 2012 iC-Haus
http://www.ichaus.com
iC227
preliminar y
Rev B1, Page 2/22
DUAL 11 GHz SAMPLING OSCILLOSCOPE
DESCRIPTION
The iC227 is an 11 GHz bandwidth Sequential Sam-
pling Oscilloscope.
The 4 SMA inputs and 2 SMA outputs all have 50
Ω
impedance and are DC coupled.
The small, portable hardware package connects to a
PC via an optically isolated full speed USB interface
for PC protection and eliminates effects of noise from
the USB bus and PC ground.
All device control and monitoring is managed via an
intuitive graphical PC software interface. The use of
small package high speed ECL components allows
extremely wide bandwidth and highly accurate self
calibrated time base with 1 ps resolution.
This low cost, easy to use device is a perfect solu-
tion for engineers and technicians alike who need to
measure amplitude, rise time, fall time, propagation
delay and much more in high speed analog and digi-
tal circuit.
iC227 will work with repetitive signals only, since
it requires multiple signal repetitions to complete
the conversion.
When 2 channels are used, there must be some
fixed timing correlation between these channels
in order for sampling to be an accurate represen-
tation of the real event.
If the frequency on 2 channels is different but
there is a clear timing correlation or synchroniza-
tion, then the channel with the lower frequency
should be used as trigger source.
ELECTRICAL CHARACTERISTICS
After calibration. Designed and tested for laboratory environment with temperature 20 to 25 °C. Aluminum enclosure is used as heat sink
and will warm to about 10 °C above ambient temperature.
Item
No.
101
102
103
104
105
106
107
108
109
110
Case
201
202
203
Dim
F
P
Enclosure size
Weight
Power consumption
9...16 VDC, regulated adapter 100-240 VAC
102 x 56 x 123
0.31
5 W +/-10 %
mm
kg
Symbol
Parameter
Conditions
Min.
BW(IN)
BW(SPL)
BW(TR)
f(TR)min
TB
TBacc
ResV
AccV
DivV
Vin
max
Bandwidth at CH1 and CH2
Bandwidth when internal power
splitter is used
Trigger input bandwidth
Min. trigger frequency
Time base range
Time base accuracy
Vertical resolution
Vertical accuracy with direct
CH1/CH2 Inp
Vertical divisions
Maximum input voltage
in 1-2-5 sequence
Sampler
Trigger
10
in 1-2-5 sequence
25 p
12
3
1000
2
4
SMA 50
Ω
18 GHz, DC coupled
SMA 50
Ω
18 GHz, DC coupled
SMA 50
Ω
18 GHz, DC coupled
Typ.
11
4
2
10
100 µ
0.5 %FS +/-10 ps
Bit
%FS
mV
Vpp
Vpp
Max.
GHz
GHz
GHz
kHz
s
Unit
General
iC227
preliminar y
Rev B1, Page 3/22
DUAL 11 GHz SAMPLING OSCILLOSCOPE
BLOCK DIAGRAM AND THEORY OF OPERATION
iC227 is a simple yet very fast and accurate oscillo-
scope, consisting of a micro-controller and high speed
ECL differential circuitry.
The micro-controller receives commands and re-
sponds via an isolated USB interface running in full
speed mode at 12 Mbit/s.
The sequential scope works by inserting incremental
delays between trigger and sample circuit.
ADC conversion can not start without a trigger event.
Once the trigger has been fired, a high-speed flip flop
is set and the programmable delay lines starts count-
ing time in 10 ps increments.
A fine tuning voltage adjusts final time delay with
one picoseconds resolution using DAC calibration data
from micro-controller flash memory.
A Sample is taken on both channels simultaneously
after delay line counting is completed.
It is important to note, that each ADC conversion re-
quires multiple trigger events, limiting the scope usage
to repetitive signals only.
Achieving highly accurate and repeatable time base is
done using proprietary self calibration and fine tuning
techniques.
The device time base is calibrated after assembly and
users have the option to run auto time base calibration.
Time base calibration takes long time, since time base
is scanned with 1 ps intervals and multiple cycles are
repeated, compared to time generated by the crystal
and stored in a flash calibration look up table.
There is no need for frequent time base calibration
since the ECL logic is stable over temperature.
Figure 1: Block Diagram
iC227
preliminar y
Rev B1, Page 4/22
DUAL 11 GHz SAMPLING OSCILLOSCOPE
CONNECTION BLOCK DIAGRAM 11 GHz
If full bandwidth is required, the input signal must be
connected directly to CH1 and/or CH2. In this case
the trigger needs to be supplied via a separate cable
directly to the trigger input. The power splitter output
must always be terminated with 50 Ohm.
Figure 2: Full Bandwidth Setup
iC227
preliminar y
Rev B1, Page 5/22
DUAL 11 GHz SAMPLING OSCILLOSCOPE
CONNECTION BLOCK DIAGRAM 4 GHz
If the required bandwidth is not exceeding 4 GHz, the
input connection can be simplified by using the trigger
input power splitter. In this case the input signal is di-
vided by 2 and pre-trigger samples are available, if a
150 cm or longer external coax cable is used as delay
line between the trigger power splitter output and the
sampler input.
Figure 3: 4 GHz Setup
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