- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377845 > MAT03AH (ANALOG DEVICES INC) Low Noise, Matched Dual PNP Transistor PDF資料下載
參數(shù)資料
| 型號(hào)： | MAT03AH |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 小信號(hào)晶體管 |
| 英文描述： | Low Noise, Matched Dual PNP Transistor |
| 中文描述： | 20 mA, 36 V, 2 CHANNEL, PNP, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
| 封裝： | METAL CAN-6 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 254K |
| 代理商： | MAT03AH |
MAT03
–9–
REV. B
Q
2
and Q
3
are in series and operate at the same current levels so
the total output impedance is:
R
O
= h
FE
ro
Q3
@
(160)(1
M
)
=
160
M
.
Figure 16. Cascode Current Source
CURRE NT MAT CHING
T he objective of current source or mirror design is generation of
currents that are either matched or must maintain a constant ra-
tio. However, mismatch of base-emitter voltages cause output
current errors. Consider the example of Figure 17a. If the resis-
tors and transistors are equal and the collector voltages are the
same, the collector currents will match precisely. Investigating
the current-matching errors resulting from a nonzero V
OS
, we
define
I
C
as the current error between the two transistors.
Graph 17b describes the relationship of current matching errors
versus offset voltage for a specified average current I
C
. Note that
since the relative error between the currents is exponentially pro-
portional to the offset voltage, tight matching is required to de-
sign high accuracy current sources. For example, if the offset
voltage is 5 mV at 100
μ
A collector current, the current match-
ing error would be 20%. Additionally, temperature effects such
as offset drift (3
μ
V/
°
C per mV of V
OS
) will degrade performance
if Q
1
and Q
2
are not well matched.
DIGIT ALLY PROGRAMMABLE BIPOLAR CURRE NT
PUMP
T he circuit of Figure 18 is a digitally programmable current
pump. T he current pump incorporates a DAC08, and a fast
Wilson current source using the MAT 03. Examining Figure 18,
the DAC08 is set for 2 mA full-scale range so that bipolar cur-
rent operation of
±
2 mA is achieved. T he Wilson current mirror
maintains linearity within the LSB range of the 8-bit DAC08
(
±
2 mA/256 = 15.6
μ
A resolution) as seen in Figure 19. A
negative feedback path established by Q
2
regulates the collector
current so that it matches the reference current programmed by
the DAC08.
Collector-emitter voltages across both Q
1
and Q
3
are matched
by D
1
, with Q
3
’s collector-emitter voltage remaining constant,
independent of the voltage across the current source output.
Since Q
2
buffers Q
3
, both transistors in the MAT 03, Q
1
and Q
3
,
maintain the same collector current. D
2
and D
3
form a Baker
clamp which prevents Q
2
from turning off, thereby improving
the switching speed of the current mirror. T he feedback serves
to increase the output impedance and improves accuracy by re-
ducing the base-width modulation which occurs with varying
collector-emitter voltages. Accuracy and linearity performance
of the current pump is summarized in Figure 19.
Figure 17a. Current Matching Circuit
Figure 17b. Current Matching Accuracy %
vs. Offset Voltage
Figure 18. Digitally Programmable Bipolar Current Pump
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAT03EH | Low Noise, Matched Dual PNP Transistor |
| MAT03FH | Low Noise, Matched Dual PNP Transistor |
| MAT04FY | Matched Monolithic Quad Transistor |
| MAT04 | Matched Monolithic Quad Transistor |
| MAT04EY | Matched Monolithic Quad Transistor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAT03AH/883C | 制造商:Rochester Electronics LLC 功能描述:HI-SPEED DUAL PNP TRANS-L - Bulk |
| MAT03ARC/883C | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MAT03EH | 功能描述:IC TRANS DUAL MATCHED PNP TO78-6 RoHS:否 類別:分離式半導(dǎo)體產(chǎn)品 >> 晶體管(BJT) - 陣列 系列:- 標(biāo)準(zhǔn)包裝:10,000 系列:- 晶體管類型:2 NPN（雙） 電流 - 集電極 (Ic)（最大）:100mA 電壓 - 集電極發(fā)射極擊穿（最大）:45V Ib、Ic條件下的Vce飽和度（最大）:600mV @ 5mA，100mA 電流 - 集電極截止（最大）:- 在某 Ic、Vce 時(shí)的最小直流電流增益 (hFE):200 @ 2mA，5V 功率 - 最大:250mW 頻率 - 轉(zhuǎn)換:250MHz 安裝類型:表面貼裝 封裝/外殼:6-TSSOP，SC-88，SOT-363 供應(yīng)商設(shè)備封裝:PG-SOT363-6 包裝:帶卷 (TR) 其它名稱:SP000747402 |
| MAT03EHZ | 功能描述:IC TRANS DUAL MATCHED PNP TO78-6 RoHS:是 類別:分離式半導(dǎo)體產(chǎn)品 >> 晶體管(BJT) - 陣列 系列:- 標(biāo)準(zhǔn)包裝:10,000 系列:- 晶體管類型:2 NPN（雙） 電流 - 集電極 (Ic)（最大）:100mA 電壓 - 集電極發(fā)射極擊穿（最大）:45V Ib、Ic條件下的Vce飽和度（最大）:600mV @ 5mA，100mA 電流 - 集電極截止（最大）:- 在某 Ic、Vce 時(shí)的最小直流電流增益 (hFE):200 @ 2mA，5V 功率 - 最大:250mW 頻率 - 轉(zhuǎn)換:250MHz 安裝類型:表面貼裝 封裝/外殼:6-TSSOP，SC-88，SOT-363 供應(yīng)商設(shè)備封裝:PG-SOT363-6 包裝:帶卷 (TR) 其它名稱:SP000747402 |
| MAT03FH | 功能描述:IC TRANS DUAL MATCHED PNP TO78-6 RoHS:否 類別:分離式半導(dǎo)體產(chǎn)品 >> 晶體管(BJT) - 陣列 系列:- 標(biāo)準(zhǔn)包裝:10,000 系列:- 晶體管類型:2 NPN（雙） 電流 - 集電極 (Ic)（最大）:100mA 電壓 - 集電極發(fā)射極擊穿（最大）:45V Ib、Ic條件下的Vce飽和度（最大）:600mV @ 5mA，100mA 電流 - 集電極截止（最大）:- 在某 Ic、Vce 時(shí)的最小直流電流增益 (hFE):200 @ 2mA，5V 功率 - 最大:250mW 頻率 - 轉(zhuǎn)換:250MHz 安裝類型:表面貼裝 封裝/外殼:6-TSSOP，SC-88，SOT-363 供應(yīng)商設(shè)備封裝:PG-SOT363-6 包裝:帶卷 (TR) 其它名稱:SP000747402 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。