Power efficient line driver

a line driver and power-efficient technology, applied in the field of amplifier topology improvement, can solve the problems of significant attenuation of distortion within the same band, and achieve the effects of improving power efficiency, low distortion levels, and reducing bias curren

Inactive Publication Date: 2001-05-24
CIRRUS LOGIC INC
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  • Abstract
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  • Claims
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AI Technical Summary

Benefits of technology

0012] The amplifier of the present invention is configured in a feedback loop with a distortion filter which employs continuous-time feedback from the output of the amplifier to shape the noise characteristic of the input to the amplification stage. The noise shaping provided by the distortion filter reduces the consequences of the tradeoff between bias current and distortion discussed above. That is, because the distortion filter results in very low levels of distortion, bias current may be reduced for a given linearity thereby resulting in a corresponding improvement in power efficiency.

Problems solved by technology

This results in significant attenuation of distortion within the same band.

Method used

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Embodiment Construction

[0032] The techniques of the present invention may be applied to any class of amplifier or line driver including classes A, B, AB, C, D, E, F, G, and H. Generalized embodiments of the invention will be discussed first. Then a specific embodiment of the invention implemented as a class G amplifier will be described. When amplifiers and line drivers are used to deliver power to a low impedance load, a low distortion design becomes challenging. Examples of an amplifier and a line driver driving low impedance loads are shown in FIGS. 2a and 2b, respectively. In FIG. 2a, audio amplifier 202 having a gain A=5 drives a 4 ohm loudspeaker. In FIG. 2b, an ADSL line driver (drivers 212 and 214) having a gain A=5 drives an effective load of 25 ohms. The present invention provides techniques for improving the linearity of such amplifiers and line drivers when driving such low impedance loads.

[0033] FIG. 3 is a diagram of an improved amplifier / line driver 300 with a second order distortion filter...

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Abstract

A signal processing circuit is described including a frequency selective network in a feedback loop. An analog-to-analog converter in the feedback loop is coupled to the frequency selective network. A continuous-time feedback path provides feedback from the output terminal of the analog-to-analog converter to the frequency selective network.

Description

RELATED APPLICATION DATA[0001] The present application claims priority from U.S. patent application Ser. No. 09 / 432,507 for POWER EFFICIENT LINE DRIVER filed on Nov. 2, 1999, which claims priority from U.S. Provisional patent application Ser. No. 60 / 123,549 for POWER EFFICIENT LINE DRIVER filed on Mar. 9, 1999, the entireties of both of which are incorporated herein by reference for all purposes.[0002] The present invention relates to signal processing techniques for providing high fidelity signal amplification with high power efficiency. More specifically, the present invention provides techniques by which distortion in all classes of amplifiers including, for example, power supply transitioning artifact in a class G amplifier, may be reduced to provide a low distortion output signal.[0003] In general, improvements in the power efficiency of electronic amplifiers and line drivers are desirable. In communications, a line driver is used to drive telecom or datacom signals on physical...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H03F1/34H03F1/02H03H11/12H04L25/02
CPCH03F1/0244H03F2200/331H03H11/1217
Inventor AHUJA, BHUPENDRA K.DELANO, CARY L.TRIPATHI, ADYA S.
Owner CIRRUS LOGIC INC
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