MIL- STD-883F 2004 TEST METHOD STANDARD MICROCIRCUITS - 第562页

MIL-STD-883F METHOD 4003.1 22 March 1989 2 3.1 Common mode input voltage r ange . 3.1.1 Differ ential i nput ampli fier . This test s hall be an i mplied meas urement. The maximum common mode input vol tage speci fied f …

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MIL-STD-883F
METHOD 4003.1
22 March 1989
1
METHOD 4003.1
COMMON MODE INPUT VOLTAGE RANGE
COMMON MODE REJECTION RATIO
SUPPLY VOLTAGE REJECTION RATIO
1. PURPOSE
. This method establishes the means for measuring common mode input voltage range, common mode
rejection ratio, and supply voltage rejection ratio.
1.1 Definitions
. The following definitions shall apply for the purpose of this test method.
1.1.1 Common mode input voltage range (V
CM
). The common mode input voltage range is that range of common mode
input voltages which, if exceeded, will cause the amplifier to distort or is that range of voltage which may be applied to the
input terminals of the device without decreasing the common mode rejection ratio (CMRR) by more than 6 dB.
1.1.2 Common mode rejecton ratio (CMRR)
. The common mode rejection ratio is the ratio of the differential open loop
gain, A
D
, to the common mode voltage gain, A
C
.
CMRR =
A
A
D
C
CMRR is usually expressed in decibels:
CMRR = 20
A
A
D
C
log
Common mode rejection ratio can also be expressed as the ratio of change in offset voltage to the change in common mode
voltage.
CMRR = 20
V
V
IO
CM
log
∆
∆
1.1.3 Power supply rejection ratio (PSRR)
. The power supply rejection ratio is the ratio of the change in input offset
voltage
∆V
IO
, to the corresponding change in one power supply voltage with all remaining power supply voltage(s) held
constant.
+PSRR =
V
V
V
= constant
IO
CC
BB
∆
∆
- PSRR =
V
V
V
= constant
IO
BB
CC
∆
∆
PSRR =
V
A
V
O
DCC
∆
∆
2. APPARATUS
. The apparatus shall consist of appropriate test equipment capable of measuring specified parameters
and an appropriate test fixture with standard input, output, and feedback resistances.
3. PROCEDURE
. The test figures show the connections for the various test conditions. Assume all switches normally
closed. The feedback resistance, R
2
for figure 4003-1, shall be no larger than the nominal input impedance nor less than a
value which will load the amplifier (100 x Z
OUT
). Specified stabilization and power supply decoupling shall be added where
applicable.
MIL-STD-883F
METHOD 4003.1
22 March 1989
2
3.1 Common mode input voltage range.
3.1.1 Differential input amplifier
. This test shall be an implied measurement. The maximum common mode input voltage
specified for the amplifier shall be used in making the common mode rejection ratio test of 3.2.
3.2 Common mode rejection ratio
.
CMRR
A
A
D
C
=
where A
D
= differential gain, and A
C
= common-mode gain.
3.2.1 Differential input amplifier using null loop
. The test figure is shown on figure 4003-1, all switches are closed. Raise
V+, V-, and V
C
to V
CM
volts above nominal (i.e., if V+ = 15, V- = -15, V
C
= 0, V
CM
= 10, then set V+ = 25, V- = -5, and V
C
=
10). Measure E
01
. Lower V+, V-, and V
C
to V
CM
volts below nominal. Measure E
02
.
CMRR = 20
R
R
(
E
-
E
)
V
1
2
01 02
CM
log
∆
3.3 Power supply rejection ratio
.
3.3.1 Differential input amplifier
. The power supply shall be adjusted for a value equal to the average of the maximum and
minimum allowable supply voltage. The signal generator connected to the power supply under test shall be adjusted such
that the voltage input at the amplifier under test swings between maximum and minimum specified values. Then:
PSRR = 20
R
R
(
V
)
V
1
2
O
CC
log
∆
∆
where: V
0
= Change in output voltage (peak)
V
CC
= Change in supply voltage (peak)
The frequency used shall be as specified.
3.3.2 Differential input amplifier using null loop
. The test figure is shown on figure 4003-1. Set V
C
to zero. For +PSRR
set V- to constant voltage and set V+ to minimum value and measure E
01
; set the V+ supplies to maximum values and
measure E
02
.
+ PSRR = 20
R
R
(
E
-
E
)
DV
1
2
02 01
CC
log
where DV
CC
is the total change in power supply voltage (if the supplies vary from +5 to +20 V, DV
CC
= 20 - 5 = 15 V). For
-PSRR repeat the above measures with V+ supply held constant and V- varied between the minimum and the maximum
value, measure E
03
and E
04
respectively.
- PSRR = 20
R
R
(
E
-
E
)
DV
1
2
04 03
CC
log
MIL-STD-883F
METHOD 4003.1
22 March 1989
3
4. SUMMARY. The following details shall be specified in the applicable acquisition document for specified values of C
1
,
C
2
, R
1
, R
2
, R
L,
and ±V
CC
for the nulling amplifier.
a. V
CM
at specified temperature(s).
b. CMRR at specified temperature(s). V
I
signal frequency when applicable.
c. PSRR, when applicable, at specified temperature(s).
d. Test temperature(s). Unless otherwise specified, all parameters shall be measured at the minimum and maximum
specified ambient operating temperature and at 25°C ambient.