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Commutating amplifier with wide dynamic range

An amplifier and amplifier-level technology, applied in the field of variable gain amplifiers, can solve problems such as power leakage and system capacity reduction

Active Publication Date: 2014-04-02
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is important because any distortion produced by the transmitter leaks power into adjacent communication channels, reducing system capacity

Method used

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  • Commutating amplifier with wide dynamic range
  • Commutating amplifier with wide dynamic range
  • Commutating amplifier with wide dynamic range

Examples

Experimental program
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Effect test

Embodiment Construction

[0023] figure 1 A polar modulation transmitter is illustrated. The transmitter operates efficiently due to the simplicity of its design, consisting of a phase locked loop (PLL) to provide phase / frequency modulation and an adjustable amplifier to provide amplitude / envelope modulation.

[0024] Such as figure 2 As shown in , an RF carrier can be amplitude modulated with a double-balanced mixer. The mixer uses a phase / frequency modulated RF carrier to switch the differential pair formed by transistors N1-N4. This action will be driven by the differential current +I AM (t) and -I AM (t) represents the conversion of the amplitude modulated signal into the transmit frequency. These devices N 5 -N 6 Acts as a cascode amplifier stage that isolates the output from the differential pair switch and signal source swing. load consists of two values ​​of 1 / 2R L The back-end resistor of the component R L , Balun (balun) L 1 and tuning capacitor C 1 composition. These components...

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PUM

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Abstract

Variable gain commutating amplifier apparatus and methods for use in a polar modulator are described. The apparatus may include two or more commutating amplifier stages configured to be switched to an output load based on a desired amplitude and / or transmit power level. The amplifier stages may include cross-coupled differential pairs to cancel RF carrier feedthrough. An additional R-2R ladder circuit may be provided to further extend the dynamic range by reducing the output power at the lowest output stages.

Description

[0001] related application [0002] This application claims priority to US Provisional Patent Application Serial No. 61 / 019,967, filed January 9, 2008, and entitled "COMMUTATINGAMPLIFIER WITH WIDE DYNAMIC RANGE". This application is also related to US Utility Patent No. 6,985,703, issued January 10, 2006, entitled "DIRECTSYNTHESIS TRANSMITTER". The content of each of these applications is hereby incorporated by reference in its entirety for all purposes. technical field [0003] The present invention relates generally to variable gain amplifiers used in communication transmitters. More particularly but not exclusively, the present invention relates to a variable gain amplifier having a rectifying structure configured to provide variable output power. Background technique [0004] Signals transmitted in wireless communication systems often vary in strength, requiring the use of variable gain amplifiers in radio transceivers. A variable gain amplifier operates to compensate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45
CPCH03F2203/45731H03F2203/45566H03F3/211H03F3/45188
Inventor J·葛罗M·法里亚斯E·夏皮罗
Owner NXP BV