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| 型号： | TLV2264QDRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 运算放大器 |
| 英文描述： | QUAD OP-AMP, 3000 uV OFFSET-MAX, 0.67 MHz BAND WIDTH, PDSO14 |
| 封装： | GREEN, PLASTIC, SOIC-14 |
| 文件页数： | 33/62页 |
| 文件大小： | 1569K |
| 代理商： | TLV2264QDRG4 |
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TLV226x, TLV226xA
Advanced LinCMOS RAILTORAIL
OPERATIONAL AMPLIFIERS
SLOS186C FEBRUARY 1997 REVISED AUGUST 2006
39
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
driving large capacitive loads
The TLV226x is designed to drive larger capacitive loads than most CMOS operational amplifiers. Figure 51
and Figure 52 illustrate its ability to drive loads greater than 400 pF while maintaining good gain and phase
margins (Rnull = 0).
A smaller series resistor (Rnull) at the output of the device (see Figure 61) improves the gain and phase margins
when driving large capacitive loads. Figure 51 and Figure 52 show the effects of adding series resistances of
10
, 20 , 50 , and 100 . The addition of this series resistor has two effects: the first is that it adds a zero
to the transfer function and the second is that it reduces the frequency of the pole associated with the output
load in the transfer function.
The zero introduced to the transfer function is equal to the series resistance times the load capacitance. To
calculate the improvement in phase margin, equation (1) can be used.
θ
m1 + tan
–1 2 ×π × UGBW × R
null ×
C
L
θ
m1 + improvement in phase margin
UGBW
+ unity-gain bandwidth frequency
R
null + output series resistance
C
L + load capacitance
(1)
Where :
The unity-gain bandwidth (UGBW) frequency decreases as the capacitive load increases (see Figure 53). To
use equation 1, UGBW must be approximated from Figure 53.
Using equation 1 alone overestimates the improvement in phase margin as illustrated in Figure 59. The
overestimation is caused by the decrease in the frequency of the pole associated with the load, providing
additional phase shift and reducing the overall improvement in phase margin. The pole associated with the load
is reduced by the factor calculated in equation 2.
F
+
1
) gm × R
null
F
+ factor reducing frequency of pole
gm + small-signal output transconductance (typically 4.83 × 10
–3 mhos)
R
null + output series resistance
(2)
Where :
For the TLV226x, the pole associated with the load is typically 7 MHz with 100-pF load capacitance. This value
varies inversely with CL: at CL = 10 pF, use 70 MHz, at CL = 1000 pF, use 700 kHz, and so on.
Reducing the pole associated with the load introduces phase shift, thereby reducing phase margin. This results
in an error in the increase in phase margin expected by considering the zero alone (equation 1). Equation 3
approximates the reduction in phase margin due to the movement of the pole associated with the load. The
result of this equation can be subtracted from the result of the equation 1 to better approximate the improvement
in phase margin.
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| TX-1N4804 | VHF-UHF BAND, 12 pF, 110 V, SILICON, ABRUPT VARIABLE CAPACITANCE DIODE, DO-14 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TLV2264QDRQ1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Advanced LinCMOSa?￠ RAIL-TO-RAIL OPERATIONAL AMPLIFIERS |
| TLV226X | 制造商:TI 制造商全称:Texas Instruments 功能描述:Advanced LinCMOS RAIL-TO-RAIL OPERATIONAL AMPLIFIERS |
| TLV226X_06 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:ADVANCED LINCOMS RAIL-TO-RAIL OPERATIONAL AMPLIFIERS |
| TLV226X_07 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Advanced LinCMOS RAIL-TO-RAIL OPERATIONAL AMPLIFIERS |
| TLV226X_08 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Advanced LinCMOS RAIL-TO-RAIL OPERATIONAL AMPLIFIERS |
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