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參數(shù)資料
| 型號(hào)： | 935056440602 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 放大器 |
| 英文描述： | RF/MICROWAVE WIDE BAND LOW POWER AMPLIFIER |
| 封裝： | SOT109-1, MS-012AC, SO-16 |
| 文件頁數(shù)： | 16/21頁 |
| 文件大小： | 243K |
| 代理商： | 935056440602 |
Philips Semiconductors
Product specification
SA5219
Wideband variable gain amplifier
1997 Nov 07
4
AC ELECTRICAL CHARACTERISTICS
TA = 25oC, VCC1 = VCC2 = +5.0V, VAGC = 1.0V, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
BW
-3dB bandwidth
700
MHz
GF
Gain flatness
DC - 500MHz
+0.4
dB
VIMAX
Maximum input voltage swing (single-ended) for
linear operation1
200
mVP-P
VOMAX
Maximum output voltage swing (single-ended)
RL = 50
400
mVP-P
VOMAX
for linear operation1
RL = 1k
1.9
VP-P
NF
Noise figure (unmatched configuration)
RS = 50, f = 50MHz
9.3
dB
VIN-EQ
Equivalent input noise voltage spectral density
f = 100MHz
2.5
nV/
√Hz
S12
Reverse isolation
f = 100MHz
-60
dB
G/VCC
Gain supply sensitivity (single-ended)
0.3
dB/V
G/T
Gain temperature sensitivity
RL = 50
0.013
dB/
°C
CIN
Input capacitance (single-ended)
2
pF
BWAGC
-3dB bandwidth of gain control function
20
MHz
PO-1dB
1dB gain compression point at output
f = 100MHz
-3
dBm
PI-1dB
1dB gain compression point at input
f = 100MHz, VAGC
=0.1V
-10
dBm
IP3OUT
Third-order intercept point at output
f = 100MHz, VAGC
>0.5V
+13
dBm
IP3IN
Third-order intercept point at input
f = 100MHz, VAGC
<0.5V
+5
dBm
GAB
Gain match output A to output B
f = 100MHz, VAGC = 1V
0.1
dB
NOTE:
1. With RL > 1k, overload occurs at input for single-ended gain < 13dB and at output for single-ended gain > 13dB. With RL = 50, overload
occurs at input for single-ended gain < 6dB and at output for single-ended gain > 6dB.
SA5219 APPLICATIONS
The SA5219 is a wideband variable gain amplifier (VGA) circuit
which finds many applications in the RF, IF and video signal
processing areas. This application note describes the operation of
the circuit and several applications of the VGA. The simplified
equivalent schematic of the VGA is shown in Figure 2. Transistors
Q1-Q6 form the wideband Gilbert multiplier input stage which is
biased by current source I1. The top differential pairs are biased
from a buffered and level-shifted signal derived from the VAGC input
and the RF input appears at the lower differential pair. The circuit
topology and layout offer low input noise and wide bandwidth. The
second stage is a differential transimpedance stage with current
feedback which maintains the wide bandwidth of the input stage.
The output stage is a pair of emitter followers with 50
output
impedance. There is also an on-chip bandgap reference with
buffered output at 1.3V, which can be used to derive the gain control
voltage.
Both the inputs and outputs should be capacitor coupled or DC
isolated from the signal sources and loads. Furthermore, the two
inputs should be DC isolated from each other and the two outputs
should likewise be DC isolated from each other. The SA5219 was
designed to provide optimum performance from a 5V power source.
However, there is some range around this value (4.5 - 7V) that can
be used.
The input impedance is about 1k
. The main advantage to a
differential input configuration is to provide the balun function.
Otherwise, there is an advantage to common mode rejection, a
specification that is not normally important to RF designs. The
source impedance can be chosen for two different performance
characteristics: Gain, or noise performance. Gain optimization will
be realized if the input impedance is matched to about 1k
. A 4:1
balun will provide such a broadband match from a 50
source.
Noise performance will be optimized if the input impedance is
matched to about 200
. A 2:1 balun will provide such a broadband
match from a 50
source. The minimum noise figure can then be
expected to be about 7dB. Maximum gain will be about 23dB for a
single-ended output. If the differential output is used and properly
matched, nearly 30dB can be realized. With gain optimization, the
noise figure will degrade to about 8dB. With no matching unit at the
input, a 9dB noise figure can be expected from a 50
source. If the
source is terminated, the noise figure will increase to about 15dB.
All these noise figures will occur at maximum gain.
The SA5219 has an excellent noise figure vs gain relationship. With
any VGA circuit, the noise performance will degrade with decreasing
gain.
The 5219 has about a 1.2dB noise figure degradation for
each 2dB gain reduction. With the input matched for optimum gain,
the 8dB noise figure at 23dB gain will degrade to about a 20dB
noise figure at 0dB gain.
The SA5219 also displays excellent linearity between voltage gain
and control voltage. Indeed, the relationship is of sufficient linearity
that high fidelity AM modulation is possible using the SA5219. A
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