关于运放"频率vs增益"的疑问

laojiededepan

关于运放"频率vs增益"的疑问 [复制链接]

High Performance Video Op Amp
AD811
Rev. E
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
FEATURES
High speed
140 MHz bandwidth (3 dB, G = +1)
120 MHz bandwidth (3 dB, G = +2)
35 MHz bandwidth (0.1 dB, G = +2)
2500 V/μs slew rate
25 ns settling time to 0.1% (for a 2 V step)
65 ns settling time to 0.01% (for a 10 V step)
Excellent video performance (RL =150 Ω)
0.01% differential gain, 0.01° differential phase
Voltage noise of 1.9 nV/√Hz
Low distortion: THD = −74 dB @ 10 MHz
Excellent dc precision: 3 mV max input offset voltage
Flexible operation
Specified for ±5 V and ±15 V operation
±2.3 V output swing into a 75 Ω load (VS = ±5 V)

为什么增益要求不高的时候(0.1dB)带宽(35Mhz)反而较小？括号里的"G = +2"代表什么意思？

laojiededepan

虽然是英文，但是对于做过设计的工程师们来说，应该不难看懂，请大家耐心帮忙解决一下 谢了

lixiaohai8211