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參數(shù)資料
| 型號： | MAT02EHZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 小信號晶體管 |
| 英文描述： | 20 mA, 40 V, 2 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
| 封裝： | METAL CAN-6 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 260K |
| 代理商： | MAT02EHZ |
OBSOLETE
MAT02
–8–
REV. E
more troublesome because they vary with signal levels and are
multiplied by absolute temperature. At 25
°C, kT/q is
approximately 26 mV and the error due to an rBEIC term will be
rBEIC/26 mV. Using an rBE of 0.4
for the MAT02 and assum-
ing a collector current range of up to 200
A, then a peak error
of 0.3% could be expected for an rBEIC error term when using
the MAT02. Total error is dependent on the specific application
configuration (multiply, divide, square, etc.) and the required
dynamic range. An obvious way to reduce ICrBE error is to re-
duce the maximum collector current, but then op amp offsets
and leakage currents become a limiting factor at low input lev-
els. A design range of no greater than 10
A to 1 mA is generally
recommended for most nonlinear function circuits.
A powerful technique for reducing error due to ICrBE is shown in
Figure 4. A small voltage equal to ICrBE is applied to the transis-
tor base. For this circuit:
VB =
RC
R2
V1 and ICrBE =
rBE
R1
V1
(10)
The error from rBEIC is cancelled if RC/R2 is made equal to rOUT R1.
Since the MAT02 bulk resistance is approximately 0.39
, an
RC of 3.9
and R2 of 10 R1 will give good error cancellation.
In more complex circuits, such as the circuit in Figure 3, it may
be inconvenient to apply a compensation voltage to each indi-
vidual base. A better approach is to sum all compensation to the
bases of Q1. The “A” side needs a base voltage of (VO/RO + VZ/
R3) rBE, and the “B” side needs a base voltage of (VX/R1+VY/R2)
rBE. Linearity of better than
±0.1% is readily achievable with
this compensation technique.
Operational amplifier offsets are another source of error. In
Figure 4, the input offset voltage and input bias current will
cause an error in collector current of (VOS/R1) + IB. A low
offset op amp, such as the OP07 with less than 75
V of VOS
and IB of less than
± 3 nA, is recommended. The OP193,
micropower op amp, should be considered if low power con-
sumption or single-supply operation is needed. The value of
frequency-compensating capacitor (CO) is dependent on the
op amp frequency response and peak collector current. Typi-
cal values for CO range from 30 pF to 300 pF.
Figure 4. Compensation of Bulk Resistance Error
FOUR-QUADRANT MULTIPLIER
A simplified schematic for a four-quadrant log-antilog multiplier
is shown in Figure 5. Similar to the previously discussed one-
quadrant multiplier, the circuit makes IO = I1 I2/I3. The two
input currents, I1 and I2, are each offset in the positive direction.
This positive offset is then subtracted out at the output stage.
Assuming ideal op amps, the currents are:
I
V
R
V
R
I
V
R
V
R
XR
Y
R
1
12
2
12
=+
=
+
,
(11)
I
V
R
V
R
V
R
V
R
I
V
R
O
XY
R
O
R
=+
+
=
11
2
3
2
,
From IO = I1 I2/I3, the output voltage will be:
VO =
ROR2
R1
2
V XVY
V R
(12)
Figure 5. Four-Quadrant Multiplier
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAT-02EH | 20 mA, 40 V, 2 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
| MAT02FHZ | 20 mA, 40 V, 2 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
| MAT03FHZ | 20 mA, 36 V, 2 CHANNEL, PNP, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
| MAT-03FH | 20 mA, 36 V, 2 CHANNEL, PNP, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
| MAT-03EH | 20 mA, 36 V, 2 CHANNEL, PNP, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAT02FH | 制造商:Analog Devices 功能描述:IC TRANSISTOR MATCHED MONO |
| MAT02FHZ | 制造商:Analog Devices 功能描述: |
| MAT02NBC | 制造商:Analog Devices 功能描述: |
| MAT03 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Noise, Matched Dual PNP Transistor |
| MAT03AH | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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