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Method of achieving high selectivity in receiver RF front-ends

A terminal and amplifier technology, applied in the circuit field, can solve problems such as hindering signal suppression and difficult equivalent Q

Active Publication Date: 2013-11-20
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in typical process technologies, even by using high-Q capacitors and inductors with relatively low load tank resistance Rtank 236, it is still difficult to get an equivalent Q of 8 or more from this network, and out-of-band hinders signal rejection thus Limited to a few decibels (dB)

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Embodiment Construction

[0030] Aspects of the invention are disclosed in the following description and associated drawings directed to specific embodiments of the invention. Alternative embodiments may be devised without departing from the scope of the present invention. Additionally, well-known elements of the invention will not be described in detail or will be omitted so as not to obscure the relevant details of the invention.

[0031] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Likewise, the term "embodiments of the invention" does not require that all embodiments of the invention include the discussed feature, advantage or mode of operation.

[0032]The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the invention. A...

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Abstract

According to some embodiments, an apparatus may comprise an amplifier, wherein the amplifier comprises: an output stage formed of a positive output terminal providing a positive output voltage and a negative output terminal providing a negative output voltage; a load tank coupled in parallel with the output stage and configured to filter signals received at the amplifier; and a negative resistance block coupled in parallel with the output stage and the load tank.

Description

technical field [0001] The present invention relates generally to circuits and, more particularly, to improving the selectivity of receiver front ends suitable for wireless communications and other applications. Background technique [0002] In low power wireless receiver design, a major difficulty is presented by the presence of strong (ie, relatively high amplitude) blocker or interfering signals operating at frequencies similar to those of the desired signal. For example, a Global Positioning System (GPS) receiver operating at approximately 1575 MHz may receive significant interference from a CDMA wireless communication system operating at approximately 1700 MHz. These blocking signals can affect the design of several important aspects of the receiver, such as linearity, local oscillator (LO) phase noise, mismatch tolerance, power consumption, etc. For zero intermediate frequency (IF) and low IF transceiver designs, strong interfering signals close in frequency to the de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45H03F3/191
CPCH03F2203/45704H03F2203/45644H03F3/191H03F3/45188H03F3/193H03F3/45H04B1/16
Inventor 阿努普·萨芙拉罗杰·布罗肯布拉夫
Owner QUALCOMM INC