Advance Product Information
May 23, 2002
10 GB/s Differential Transimpedance Amplifier
Key Features
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TGA4805-EPU
0.25 um pHEMT Technology
Frequency Range; 30 KHz to > 11GHz
1000
Ω
Differential Transimpedance
Average Input Eq. Noise: 9 pA /
√
Hz
Single Supply Operation: +5V @ 45 mA
Chip Size: 1.1 x 0.91 mm
Primary Applications
Description
The TriQuint TGA4805-EPU is a
wideband transimpedance amplifier with
differential outputs that provides 500 Ohm
single-ended transimpedance into a
50 Ohm termination (1000 Ohm
differential into a 100 Ohm termination).
Typical output return loss is > 15 dB and
the average equivalent input noise current
is 9 pA/
√
Hz (1 GHz to 10 GHz). Typical
3dB BW is 30 KHz to 11GHz with 0.2 pF
of photodiode capacitance.
The TGA4805 operates from a single +5V
supply typically dissipating 225mW of DC
power. The device is backside grounded
with vias and requires no grounding bond
wires.
The TGA4805 requires off-chip decoupling
and the RF ports are DC coupled. Each
device is 100% RF tested on-wafer to
ensure performance compliance. The
device is available in die form.
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OC192/STM-64 Fiber-Optic Systems
Typical Measured Performance
63
Transimpedance (dB-Ohm)
0
-6
-9
-12
-15
-18
-21
CPD = 0.2 pF
RPD = 10 Ohm
1
3
5
7
9
11
13
15
Output Return Loss (dB)
60
57
54
51
48
45
42
39
36
33
Frequency (GHz)
Differential TZ (dB-Ohm)
S22 Inverting Output
S22 Noninverting Output
-3
-24
-27
-30
60
Group Delay Ripple (ps)
50
40
30
20
10
0
-10
1
3
5
7
9
11
13
15
Frequency (GHz)
CPD = 0.2 pF
RPD = 10 Ohm
Note: Devices designated as EPU are typically early in their characterization process prior to finalizing all electrical and process
specifications. Specifications are subject to change without notice.
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TriQuint Semiconductor Texas : Phone (972)994-8465 Fax (972)994 8504 Web: www.triquint.com
TRIQUINT [ TRIQUINT SEMICONDUCTOR ]
