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PDF RMDA29000 Data sheet ( Hoja de datos )
| Número de pieza | RMDA29000 | |
| Descripción | 27-31 GHz Drive Amplifier MMIC | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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June 2004
RMDA29000
27–31 GHz Drive Amplifier MMIC
General Description
The Fairchild Semiconductor RMDA29000 is a high
efficiency driver amplifier designed for use in point to point
and point to multi-point radios, and various communi-
www.DataSheet4U.com cations applications. The RMDA29000 is a 3-stage GaAs
MMIC amplifier utilizing our advanced 0.15µm gate length
Power PHEMT process and can be used in conjunction
with other driver or power amplifiers to achieve the required
total power output.
Features
• 22dB small signal gain (typ.)
• 23dBm saturated power out (typ.)
• Circuit contains individual source Vias
• Chip Size 3.41mm x 1.62mm
Device
Absolute Ratings
Symbol
Vd
Vg
Vdg
ID
PIN
TC
TSTG
Rjc
Parameter
Positive DC Voltage (+5V Typical)
Negative DC Voltage
Simultaneous (Vd–Vg)
Positive DC Current
RF Input Power (from 50Ω source)
Operating Baseplate Temperature
Storage Temperature Range
Thermal Resistance (Channel to Backside)
Ratings
+6
-2
+8
360
+10
-30 to +85
-55 to +125
38
Units
V
V
V
mA
dBm
°C
°C
°C/W
©2004 Fairchild Semiconductor Corporation
RMDA29000 Rev. C
1 page  
Recommended Procedure for Biasing and Operation
CAUTION: LOSS OF GATE VOLTAGE (Vg) WHILE
DRAIN VOLTAGE (Vd) IS PRESENT MAY DAMAGE THE
AMPLIFIER CHIP.
The following sequence of steps must be followed to
properly test the amplifier:
Step 1: Turn off RF input power.
Step 2: Connect the DC supply grounds to the ground of
the chip carrier. Slowly apply negative gate bias supply
voltage of -1.5V to Vg.
www.DataSheet4U.com Step 3: Slowly apply positive drain bias supply voltage of
+5V to Vd.
Step 4: Adjust gate bias voltage to set the quiescent
current of Idq = 250mA.
Step 5: After the bias condition is established, the RF input
signal may now be applied at the appropriate frequency
band.
Step 6: Follow turn-off sequence of:
(i) Turn off RF input power,
(ii) Turn down and off drain voltage (Vd),
(iii) Turn down and off gate bias voltage (Vg).
An example auto bias sequencing circuit to apply negative
gate voltage and positive drain voltage for the above
procedure is shown below.
D3
D1N6098
+6V
D2
D1N6098
R1
3.0k
C1
0.1µF
R3
1.0k
–2.62V
R4
1.2k
* + V+ U2
AD820/AD
V-
–
R2 0
6.8k
0
1
U1A
2 7400
3
C2
0 0.47µF
LM2941T
2 CNT
4 IN
3
5
OUT
GND
ADJ
1
MMIC_+VDD
C3
22µF
R6
0 1k
R5
3k
0
0 *Adj. For –Vg
–5V
*–5V Off: +3.33V
–5V Off: +1.80V
C4 R7
0.1µF 8.2k R8
1.0k
C5
0.1µF
MMIC_–VG
00
0
©2004 Fairchild Semiconductor Corporation
RMDA29000 Rev. C
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet RMDA29000.PDF ] | |
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