AN1106: Practical Current Feedback Amplifier Design Considerations
نویسنده
چکیده
The current-feedback (CMF) amplifier is a fundamentally different approach to high-frequency gain blocks. Not just an input stage, it is a full amplifier topology. It has outstanding characteristics in several areas: very high slewrates, -3dB bandwidth which is almost constant with increasing circuit gain, and low high-frequency distortion. Almost all commercial CMF products offer these benefits, but, sadly they also exhibit limitations that are seldom publicized. This article is intended to point out the theoretical basis for the CMF amplifier's strengths and weaknesses, and some ways of coping with its problems.
منابع مشابه
Effective Design of a 3×4 Two Dimensional Distributed Amplifier Based on Gate Line Considerations
In this paper two dimensional wave propagation is used for power combining in drain nodes of a distributed amplifier (DA). The proposed two dimensional DA uses an electrical funnel to add the currents of drain nodes. The proposed structure is modified due to gate lines considerations. Total gain improvement is achieved by engineering the characteristic impedance of gate lines and also make appr...
متن کاملBasic considerations and topologies of switched-mode assisted linear power amplifiers
The paper presents a combined power amplifier system consisting of a linear amplifier unit with a switched-mode (class D) current dumping stage arranged in parallel. With this topology the fundamental drawback of conventional linear power amplifiers the high loss is avoided. Compared to a pure class D (switching) amplifier the presented system needs no output filter to reduce the switching freq...
متن کاملOA-15 Frequent Faux Pas in Applying Wideband Current Feedback Amplifiers
As op amp operating speeds have moved to ever higher frequencies, a whole new set of design concerns have come into play for linear op amp applications. With the development of the current feedback topology, design concerns unique to that topology must also be considered if optimal performance is to be achieved from devices offering over 200 MHz −3 dB bandwidths. This discussion will review som...
متن کاملA Novel Resistive Capacitive Feedback Trans-impedance Amplifier Optimization Using IPSO Algorithm
A novel low noise trans-impedance amplifier is proposed using low cost 0.18 µm CMOS technology. A resistive-capacitive feedback is used to extend the bandwidth of the amplifier. As the structure is inductor less, it is suitable for low cost integrated optical interconnects. In this paper Improved Particle Swarm Optimization have applied to determine optimal trans-resistance and noise of propose...
متن کاملDesign Considerations for Electromechanical Actuation in Precision Motion Systems
In this paper the actuation system, often encountered high-precision motion systems, is studied. To find out the limitations of the actuation system, a integrated electromechanical model of the amplifier, actuator and mechanics is derived. This is done in a system’s theory-approach, so that amplifier feedback circuit design can be tuned using loop-shaping techniques. Stability analysis is carri...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2003