The earliest IC op amp OUTPUT stages were NPN emitter followers with NPN current sources or resistive pull-downs, as shown in Figure 1.6.

最初的集成运算放大器的输出级是NPN电流源的NPN放射追随器或通过电阻下拉，如图1.6所示。

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There may be saturation in the differential circuit built with the operational amplifier (op amp), which causes that the relationship between input and output is not differential expression.

用运算放大器构造的微分电路可能存在饱和现象，导致输出与输入电压之间不满足微分关系，使微分电路失去应有性能。

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In the texts of electrical circuits and electronics they will also show how to build simple filter circuits using Op-Amp.

在电路和电子技术的文献中可以找到如何用运算放大器构造简单的滤波器。

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It has Burr-Brown 2 Channel low-noise Op Amp, ELNA Audio Grade Capacitor and a R-core linear power supply - doesn't mean that much too you?

ENGADGET: High-end DVD up-scalers - a great alternative? HD

Launched by BBK spin-off Vivo in Beijing just now, this 5.7-inch Xplay takes one step further from its smaller X1 and X1S cousins by packing one extra audio chip, the OPA2604 op amp from Texas Instruments, in order to add extra oomph to Cirrus Logic's CS4398 DAC and CS8422 stereo asynchronous sample-rate converter -- both of which are featured on the X1 series.

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