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Frequency down-converter with high immunity to blocker and method thereof

A converter and down-frequency technology, applied in the field of down-converter circuits, can solve the problems of expected component loss of RF signals, large impedance of band-pass filter 150, etc.

Active Publication Date: 2019-12-06
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Second, the impedance of the bandpass filter 150 is not infinite, so it also shunts the desired component to ground, causing loss of the desired component of the RF signal

Method used

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  • Frequency down-converter with high immunity to blocker and method thereof
  • Frequency down-converter with high immunity to blocker and method thereof
  • Frequency down-converter with high immunity to blocker and method thereof

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Embodiment Construction

[0038]The present invention relates to downconverters. While the specification has described several exemplary embodiments of this invention in what are considered to be preferred modes for carrying out the invention, it should be understood that the invention may be practiced in various ways and is not limited to the specific examples described below or to the practice of these examples specific way of any characteristic. In other instances, well-known details have not been shown or described in order to avoid obscuring the invention.

[0039] Those skilled in the art understand terms and basic concepts related to microelectronics used in the present disclosure, such as "signal", "network", "capacitance", "resistance", "switch", "feedback", "negative feedback" , "Opamp", "Buffer" and "Integrator". Such terms and basic concepts will be obvious and understood by those skilled in the art, and thus will not be described in detail here.

[0040] In the present disclosure, a swi...

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PUM

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Abstract

An frequency down-converter includes a mixer configured to receive a RF (radio frequency) signal having a first end and a second end and output an intermediate signal comprising a first end and a second end in accordance with a LO (local oscillator) signal having a first end and a second end, wherein the first end and the second end of the LO signal jointly form a two-phase periodic signal of a fundamental frequency approximately equal to a mean frequency of a desired component of the RF signal. The down-converter further includes an opamp (operational amplifier) configured to receive the intermediate signal and output an output signal having a first end and a second end; a first feedback network configured to couple the second end of the output signal to the first end of the intermediatesignal; a second feedback network configured to couple the first end of the output signal to the second end of the intermediate signal; and an auxiliary mixer configured to receive the RF signal and provide a supplemental signal added to the output signal in accordance with the LO signal. Preferably, the auxiliary mixer is based on using the same circuit as the mixer but replacing each switch in the mixer with a switch in series with a capacitor.

Description

technical field [0001] The present invention relates to frequency down-converters, and more particularly, to down-converter circuits and methods with improved linearity and dynamic range. Background technique [0002] like Figure 1A As shown, the conventional down-converter 100 includes: a mixer 110, which is controlled by a local oscillator (LO) signal to receive signals including a first terminal V RF+ and the second terminal V RF- The radio frequency (RF) signal, and the output includes the first terminal V X+ and the second terminal V X- the intermediate signal, the local oscillator signal includes the first terminal V LO+ and the second terminal V LO- ; an operational amplifier 120 for receiving the intermediate signal and outputting a first terminal V IF+ and the second terminal V IF- The intermediate frequency (IF) signal; the first feedback network 130 is used to provide V IF- and V X+ feedback coupling between; and a second feedback network 140 for providin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/14
CPCH03D7/1458H03F3/45475H03F2203/45526H03D7/1466H03D7/1491H04B1/1018H03F1/34H03D7/14H04B1/30
Inventor 萨尔肯·希尤斯梁宝文林嘉亮
Owner REALTEK SEMICON CORP