增益带宽积为一兆,开环放大倍数尽量大的运放有哪些?

增益带宽积GBW为1MHz的运放太多了，像现在地球上性能最差的运放LM324、LM358、μA741它们的GBW皆可达1MHz。不过，这类运放的开环电压增益AVd一般不是很高。一般在90~100dB（100dB即开环放大倍数为100000）。推荐你用常用的LM833、NE5534、TL062、TL082、OPA27、OPA37，它们的GBW都优于1MHz。尤其是OPA27和OPA37，它们的AVd可达124dB。

OPA847

具有关断状态的宽带超低噪声电压反馈运算放大器

这个产品市面上目前只有英文的描述。

描述

The OPA847 combines very high gain bandwidth and large signal performance with an ultra-low input noise voltage (0.85nV√Hz) while using only 18mA supply current. Where power saving is critical, the OPA847 also includes an optional power shutdown pin that, when pulled low, disables the amplifier and decreases the supply current to <1% of the powered-up value. This optional feature may be left disconnected to ensure normal amplifier operation when no power-down is required.

The combination of very low input voltage and current noise, along with a 3.9GHz gain bandwidth product, make the OPA847 an ideal amplifier for wideband transimpedance applications. As a voltage gain stage, the OPA847 is optimized for a flat frequency response at a gain of +20V/V and is stable down to gains as low as +12V/V. New external compensation techniques allow the OPA847 to be used at any inverting gain with excellent frequency response control. Using this technique in a differential Analog-toDigital Converter (ADC) interface application, shown below, can deliver one of the highest dynamic range interfaces available.

特性

HIGH GAIN BANDWIDTH: 3.9GHz

LOW INPUT VOLTAGE NOISE: 0.85nV/√Hz

VERY LOW DISTORTION: –105dBc (5MHz)

HIGH SLEW RATE: 950V/µs

HIGH DC ACCURACY: VIO <±100µV

LOW SUPPLY CURRENT: 18.1mA

LOW SHUTDOWN POWER: 2mW

STABLE FOR GAINS 12

APPLICATIONS

HIGH DYNAMIC RANGE ADC PREAMPS

LOW NOISE, WIDEBAND, TRANSIMPEDANCE AMPLIFIERS

WIDEBAND, HIGH GAIN AMPLIFIERS

LOW NOISE DIFFERENTIAL RECEIVERS

ULTRASOUND CHANNEL AMPLIFIERS

IMPROVED UPGRADE FOR THE OPA687, CLC425, AND LMH6642

All trademarks are the property of their respective owners.

TLE2021（单运放）、TLE2022（双运放）、TLE2024（四运放），都是单电源4~40V，1.7MHz单位增益带宽；

TLE2141单运放）、TLE2142（双运放）、TLE2144（四运放），都是单电源4~44V，4.5MHz单位增益带宽；

MC33171（单运放）、MC33172（双运放）、MC33174（四运放），都是单电源3~44V，1.8MHz单位增益带宽；

MC33071（单运放）、MC33072（双运放）、MC33074（四运放），都是单电源3~44V，4.5MHz单位增益带宽；

MC34071（单运放）、MC34072（双运放）、MC34074（四运放），都是单电源3~44V，1.8MHz单位增益带宽；

OPA551，单电源8~60V，单位增益带宽3MHz；

TCA0372，单电源5~40V，单位增益带宽1.4MHz；

OPA37（高精度运放），单电源8~44V，单位增益带宽63MHz；

OPA27（高精度运放），单电源8~44V，单位增益带宽8MHz。

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