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Systems and methods for implementing a harmonic rejection mixer

A technology for harmonic suppression of frequency mixing and harmonics, applied in modulation transfer, electrical components, demodulation, etc., can solve problems such as consumption, high power, and large polyphase filters

Active Publication Date: 2011-06-22
SKYWORKS SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyphase filters are bulky, narrowband and consume a lot of power

Method used

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  • Systems and methods for implementing a harmonic rejection mixer
  • Systems and methods for implementing a harmonic rejection mixer
  • Systems and methods for implementing a harmonic rejection mixer

Examples

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Embodiment Construction

[0018] Various exemplary systems and methods for generating a local oscillator (LO) signal for a harmonic rejection mixer (HRM) are described with particular reference to a portable transceiver operating in a Global System for Mobile Communications (GSM) communication system embodiment, but the LO signal generation system and method can be incorporated in any transmitter implementing HRM to upconvert radio frequency (RF) signals. Furthermore, the LO signal generation systems and methods for HRM can be implemented in hardware, software, firmware, or any combination thereof. When implemented in hardware, the systems and methods may be implemented using specialized hardware elements and logic. When the systems and methods are implemented in whole or in part in software, the software can be used to control various components in the transmitter. The software may be stored in memory and executed by a suitable instruction execution system, such as a microprocessor. A hardware imple...

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Abstract

Various embodiments of systems and methods for generating local oscillator (LO) signals for a harmonic rejection mixer are provided. One embodiment is a system for generating local oscillator (LO) signals for a harmonic rejection mixer. One such system comprises a local oscillator, a divide-by-N frequency divider, a divide-by-three frequency divider, and a harmonic rejection mixer. The local oscillator is configured to provide a reference frequency signal. The divide-by-N frequency divider is configured to divide the reference frequency signal by a value N and provide an output signal. The divide-by-three frequency divider is configured to receive the output signal of the divide-by-N frequency divider and divide the output signal into three phase-offset signals. The harmonic rejection mixer is configured to receive the three phase-offset signals and eliminate third frequency harmonics.

Description

Background technique [0001] Radio frequency (RF) transmitters are found in many one-way and two-way communication devices, such as portable communication devices, cellular telephones, personal digital assistants (PDAs), and other communication devices. An RF transmitter transmits using whatever communication method is determined by the particular communication system within which the transmitter is operating. RF transmitters are often incorporated into devices that support the transmission of voice or data in multiple frequency bands. Such RF transmitters typically employ a frequency up-conversion process to control the transmit frequency of the device. In general, the up-conversion process involves superimposing baseband information on the high-frequency carrier signal. [0002] Typically, an upconverter uses one or more mixers to upconvert a baseband signal or an intermediate frequency signal (for example, a local oscillator (LO) signal) to an RF signal. The value of a con...

Claims

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Application Information

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IPC IPC(8): H03D7/00
CPCH03D2200/0086H03D7/1458H03D7/1483H03D7/1441H03D2200/0047H03D7/165H03D7/00H04W88/02
Inventor 拉贾塞卡尔·普莱拉德米特里·罗森布利特哈米德·菲鲁兹科希
Owner SKYWORKS SOLUTIONS INC