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Analog active low-pass filter

A technology of resistors and capacitors, applied in the field of analog active low-pass filter circuits, can solve the problems of reducing system performance and adverse effects on signal quality

Active Publication Date: 2017-11-21
ANALOG DEVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Undesired signals can adversely affect signal quality and degrade system performance

Method used

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  • Analog active low-pass filter
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  • Analog active low-pass filter

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Embodiment Construction

[0016] The following detailed description of certain embodiments presents various descriptions of specific embodiments of the invention. However, the invention can be embodied in many different ways, as defined and covered in the claims. In this description, reference is made to the drawings, wherein like reference numerals may indicate identical or functionally similar elements.

[0017] Active filters can have the advantages of passive filters. Advantages include reduced size or number of components, such as inductors, and improved interstage isolation. However, active filters can have certain disadvantages, such as increased noise and noise sensitivity, reduced large signal linearity, and reduced operational effectiveness for relatively higher frequencies. Active filters can also operate from an external power source, which limits their use to power-constrained applications such as mobile devices.

[0018] A low pass filter passes relatively low frequencies and attenuate...

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Abstract

The present invention relates to analog active low pass filters. Apparatus and methods for high frequency low pass filtering are disclosed. A first resistor is operably coupled between the first node and the second node. A second resistor is operably coupled between the second node and the third node. The amplifier circuit has a first input operably coupled to the third node and a first output operably coupled to the fourth node. The first output is configured to provide a first output signal. The first complex impedance network is operably coupled between the fourth node and the third node. The first feedback path is operably coupled between the fourth node and the second node. The first feedback path is configured to invert at least a portion of the first output signal. The first feedback path is further configured to provide a first feedback capacitance at the second node.

Description

technical field [0001] Embodiments of the present invention relate to electronic systems, and more specifically, to analog active low-pass filter circuits. Background technique [0002] Noise and other unwanted signals can be introduced into the signal chain. Undesired signals can adversely affect signal quality and degrade system performance. Various signal processing techniques are available to mitigate the adverse effects of undesired signals. An example of such a signal processing technique is frequency discriminative filtering. For example, a low pass filter can attenuate frequencies above a cutoff frequency while attenuating undesired signals while passing frequencies below the cutoff frequency. The cut-off frequency can be selected according to the spectrum of the desired signal and / or the undesired signal. [0003] Filters may be implemented as passive filter circuits or active filter circuits. Passive filters do not include active components (such as operationa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H11/36
CPCH03H11/126H03H2011/0477H03H11/0405
Inventor A·A·休博塔卢
Owner ANALOG DEVICES INC