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Harmonic rejection mixer

A technology of harmonic suppression mixing and frequency mixer, which is applied in the fields of modulation and conversion balancing devices, electrical components, transmission systems, etc., and can solve the problems of difficult filtering and removal of spectral energy.

Active Publication Date: 2013-12-04
SKYWORKS SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mixing an incoming signal with such a local oscillator signal generally produces undesirable spectral energy positioned close enough to the desired spectral energy that it is relatively difficult to remove by filtering

Method used

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Embodiment Construction

[0017] refer to figure 1 , the receiver system 10 may include a mixer 26 that generates a value for x( The t) signal is frequency transformed to produce a frequency transformed signal (denoted "z(t)"). For example, the x(t) signal may be a modulated signal provided by amplifier 24 in response to a signal received from antenna 22 (eg, an AM or FM signal). Due to the frequency translation by mixer 26, receiver system 10 may further process the z(t) signal to remove undesirable spectral energy, such as by including restoring the z(t) signal through a low-pass filter (LPF) 28 to produce Processing of audio signals that can be played by the loudspeaker 30 . A particular difficulty arises if the y(t) local oscillator signal is a square wave with spectral energy at the fundamental and harmonic frequencies.

[0018] More specifically, combining figure 1 refer to figure 2 , the y(t) signal may have a fundamental frequency (denoted as "f LO ”) and harmonics of the square wave sig...

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Abstract

A technique includes providing a plurality of local oscillator signals such that each of the local oscillator signals has a different phase. The technique includes providing scaling units to scale the input signal pursuant to different scaling factors to generate scaled input signals. The scaling factors are selected on a periodic function of the phases. The technique also includes providing mixing circuits to mix the local oscillator signals with the scaled input signals to generate mixed signals and providing an adder to combine the mixed signals to generate an output signal.

Description

technical field [0001] The present invention relates generally to harmonic rejection mixers. Background technique [0002] A conventional wireless receiver system may include at least one mixer to down-convert the frequency of an incoming wireless signal. More specifically, a mixer typically multiplies an incoming wireless signal with a local oscillator signal to produce a signal having spectral energy distributed over the sum and difference of the frequencies of the local oscillator and the incoming signal. If the local oscillator signal is a pure sinusoid with its spectral energy concentrated at the fundamental frequency, it is ideally relatively easy to filter out the unwanted spectral energy so that the spectral energy of the filtered signal is generally at the desired intermediate frequency. However, for some frequency mixing applications, the local oscillator signal may be non-sinusoidal, such as a square wave signal, which contains spectral energy at the fundamental ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/16
CPCH03D7/14H03D2200/0086H04B1/30
Inventor D·J·库利A·A·拉菲
Owner SKYWORKS SOLUTIONS INC