10 Gbit/s
Transimpedance
Amplifier
GD19906
Preliminary
General Description
The GD19906 is a pre-amplifier intended
for use in conjunction with a PIN photo-
detector to convert and amplify an optical
STM-64/OC-192 NRZ signal into an elec-
trical signal for further processing by
other elements of a reception system.
The GD19906 transimpedance amplifier
is intended for mounting in a hermetic
enclosure together with a low capaci-
tance (0.2 pF) photo-detector. The elec-
trical connection to the photo-detector
should be kept shortest possible.
The GD19906 transimpedance amplifier
has a single ended input. The input ter-
minal can be connected directly to the
photo-detector. Assembly of photo- de-
tector and transimpedance amplifier is
thus kept as simple as possible in order
to provide the basis for a transmission
line connection with good high frequency
characteristics.
The analogue output is a single ended
signal, which can be bonded to a nearby
output pin, or via the GIGA FlexGuide®
interconnected directly to another inte-
grated citcuit.
Features
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Low noise.
High bandwidth.
Data-rates up to 10 Gbit/s NRZ.
Small die-size, only one external cap
required.
Non-inverting.
Single supply operation: 8 V
Power dissipation: only 750 mW
Transimpedance: 500
Ω
Input photo current overload: 2.5 mA
Input equivalent noise: 12 pA/√Hz
Die size: 1.1 × 0.95 mm
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R
F
GND
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Applications
IIN
VOUT
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With PIN or APD photo-detector in
high-speed optical receiver front-end.
Tele Communication transmission
equipment:
– SDH
– SONET
WDM transmission equipment.
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VCC
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Figure 1.
Block Diagram.
Data Sheet Rev. 04
System Application
The GD19906 Transimpedance Amplifier can be used as a building block in conjunction with other GIGA products as shown in the
figure below – composing a full 10 Gbit/s receiver front-end.
PIN
diode
GD19906
GD19906
Transimpedance
Transimpedance
Amplifier
Amplifier
GD19902
GD19902
AGC
AGC
Amplifier
Amplifier
GD16544
GD16544
CDR/PLL
CDR/PLL
DeMUX
DeMUX
16*
622
Mbit/s
Figure 2.
Building blocks for a 10 Gbit/s reception system.
The GD19906 device converts and amplifies the current from the PIN diode, which is delivered to the AGC amplifier GD19902 for
further processing. This device produces a differential signal suitable for driving the GD16544 DeMUX. The 16 demultiplexed data
signals (and clock) available at the DeMUX output can be fed to a system ASIC. If required, a second level demultiplexer,
GD16334, can be added for further reduction of the signal speeds. A set of four synchronized GD16334 demultiplexers will bring
the original 10 Gbit/s signal down to 78 Mbit/s.
Please see separate data sheets for the AGC amplifier and the DeMUX devices.
GIGA offers corresponding building blocks for the transmit functions.
Applications
VCC
VCC
Pin
Photo-
Detector
Iphoto
IIN
VOUT
GND
Figure 3.
GD19906 External Circuits
Figure 4.
GD19906 Relative Frequency Response
Data Sheet Rev. 04
GD19906
Page 2 of 5
Pad List
Mnemonic:
Signal Type:
Recomm. # of
Bond Wires
1
2
4
6
3
3, Note1
1
Corresponding Description:
Inductance
[nH]
0.35
0.35
0.125
0.15
0.3
0.2 - 0.4
0.5 - 1.0
Input from PIN Diode
Analogue Output Signal
Power Supply
Signal/Supply Reference
Signal/Supply Reference
Signal/Supply Reference
Signal/Supply Reference
IIN
VOUT
VCC
GND1
GND2
GND3
GND4
Note 1:
Analog Input
Analog Output
PWR
GND
GND
GND
GND
Bandwidth and peaking may be adjusted by varying the number and length of bond wires for GND3
100 ±50
µ
m
GND2
GND3
IIN
VOUT
GND1
GND4
100 ±50
µ
m
VCC
Figure 5.
Bond Pad Locations (Die Size: 1.1 mm × 0.95 mm).
Die Physical Specifications
Item:
Die Size
Pad Size (minimum)
Die Thickness
Number of Pads
Specifications:
1.10 (±0.05) × 0.95 (±0.10)
100 × 100
175 - 200
7
Unit
mm
µm
2
µm
Data Sheet Rev. 04
GD19906
Page 3 of 5
Absolute Maximum Ratings
These are the limits beyond which the component may be damaged.
Characteristic:
Positive Supply
Operating Temperature
Storage Temperature
Maximum Input Photo-Current
0
-65
MIN.:
TYP.:
MAX.:
8.5
85
125
2.5
UNIT:
V
EC
EC
mA
DC Characteristics
T
DIE_BACK_SIDE
= 0
o
C to 85
o
C.
All voltages in the table are referred to the GND terminal.
Characteristic:
Supply Voltage Vcc
Supply Current Icc
Quiescent Bias Voltage at Input
Power Dissipation
3.7
MIN.:
7.6
TYP.:
8.0
MAX.:
8.4
120
4.7
1
UNIT:
V
mA
V
W
AC Characteristics
T
DIE_BACK_SIDE
= 0
o
C to 85
o
C, V
CC
= 8.0 V
Characteristic:
Photo-detector Capacitance
Input Equivalent Noise Current Density
Upper 3 dB Bandwidth
Lower 3 dB Bandwidth
Transimpedance Gain
Gain Flatness
Output Return Loss (to 8 GHz)
Power Supply Noise Rejection
10
6
400
500
1
10
30
12
MIN.:
TYP.:
MAX.:
0.2
15
UNIT:
pF
PA/√Hz
GHz
kHz
Ω
dB
dB
dB
Data Sheet Rev. 04
GD19906
Page 4 of 5
Precautions
Class 1 ESD
u
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Output: 300 V
Input: 100V
Outputs are open circuit protected and AC short circuit protected.
DC short circuit to ground will cause permanent damage to the die.
Note:
Storage
The bare die shall be stored in dry nitrogen or vacuum packed.
Ordering Information
To order, please specify as shown below:
Product Name:
Package Type:
Die (no package)
Temperature Range:
0..85 C
o
Options:
GD19906-DIE
GD19906, Data Sheet Rev. 04 - Date: 22 November 1999
Mileparken 22, DK-2740 Skovlunde
Denmark
Phone
: +45 7010 1062
Fax
: +45 7010 1063
E-mail
:
sales@giga.dk
Web site
:
http://www.giga.dk
Please check our Internet web site
for latest version of this data sheet.
The information herein is assumed to be
reliable. GIGA assumes no responsibility
for the use of this information, and all such
information shall be at the users own risk.
Prices and specifications are subject to
change without notice. No patent rights or
licenses to any of the circuits described
herein are implied or granted to any third
party. GIGA does not authorise or warrant
any GIGA Product for use in life support
devices and/or systems.
Distributor:
Copyright © 1999 GIGA A/S
All rights reserved
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