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Zero IF down converter with even order harmonic suppression

A technology of frequency converter and suppression circuit, which is applied to the balance device of modulation conversion, modulation transfer, demodulation of amplitude modulation oscillation, etc.

Inactive Publication Date: 2007-10-10
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Voltage-to-current converter converts RF voltage signal to RF current signal

Method used

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  • Zero IF down converter with even order harmonic suppression
  • Zero IF down converter with even order harmonic suppression
  • Zero IF down converter with even order harmonic suppression

Examples

Experimental program
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Embodiment Construction

[0013] FIG. 1 is a block diagram of an RF communication system, indicated generally at 10 . The wireless handset 20 includes an RF receiver 22 having a zero-IF down-converter 26 that converts received RF power in one frequency range to another frequency range for subsequent processing in back-end components 28. in signal processing.

[0014] The RF receiver 22 and its components are schematically illustrated in the figure; other components (not shown) may also be included. In general, the front end components 24 process a voltage at a preselected RF frequency and input this voltage to a zero IF downconverter 26 . Front-end components 24 may include amplifiers, filters, and / or oscillators (these components are not specifically shown in FIG. 1 for simplicity). The voltage signal from the front end assembly 24 is typically at a specific transmission frequency as it enters the zero IF downconverter 26 . The zero IF down-converter 26 converts the received RF voltage signal at th...

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PUM

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Abstract

An embodiment is directed to a zero IF down converter circuit. The circuit comprises a voltage-to-current converter, a mixer, and a suppression circuit. The voltage-to-current converter converts an RF voltage signal to an RF current signal. The mixer changes the frequency of the current signal to a lower frequency current signal. The suppression circuit removes a lower frequency distortion component from the RF current signal before sending the RF current signal to the mixer.

Description

[0001] Cross reference to related applications [0002] Priority is hereby claimed to US Provisional Application No. 60 / 611,203, filed September 16, 2004. [0003] copyright notice [0004] This patent document contains copyrighted information. The copyright owner has no objection to the facsimile reproduction by anyone of this patent document or this patent, as it appears in the USPTO files or records, but reserves all copyright otherwise. technical field Background technique [0005] Various aspects of the invention relate to suppression of signal distortion in radio frequency (RF) communication systems, such as wireless handsets. [0006] A radio frequency (RF) receiver mixes an incoming signal, thereby changing its carrier frequency. In a heterodyne receiver, a mixer changes the carrier frequency of the input signal to an intermediate frequency. In a direct-conversion RF receiver (also known as a zero-IFRF receiver), a mixer changes the carrier frequency of the input...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/14H03D1/22H04B1/30
CPCH03D1/2272H03D7/1441H03D7/1458H04B1/109H04B1/30H03D7/1483
Inventor 吴越
Owner QUALCOMM INC