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Mixer

A technology of mixers and operational amplifiers, applied in electrical components, balance devices for modulation conversion, modulation transfer, etc., can solve the problems of performance degradation of mixers, reduce the equivalent load value, etc., to prevent noise and improve performance. Effect

Active Publication Date: 2011-09-14
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem of mixer performance degradation due to noise interference in the prior art, one object of the present invention is to provide a mixer with a controllable load, wherein the controllable load is Reduced equivalent load values ​​during switching transients

Method used

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Embodiment Construction

[0015] In this specification and claims, certain terms are used to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use The difference in name is used as a way to distinguish components, but the difference in function of components is used as a criterion for distinction. The "comprising" mentioned in the entire specification and claims is an open term, so it should be interpreted as "Including but not limited to", in addition, the term "coupling" here includes any direct and indirect electrical connection means, therefore, if it is described in the text that the first device is coupled to the second device, it means that the first device can directly and electrically Connect to the second device, or indirectly electrically connect to the second device through other devices or connection means.

[0016] Read below for the attached pic...

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Abstract

A mixer has a controllable load, a signal mixing module, and a controller. The controllable load is controlled by a control signal to change an equivalent load value thereof. The signal mixing module has an output port coupled to the controllable load and an input port coupled to an input signal, and is used for mixing the input signal with a local oscillation signal. The controller is coupled tothe controllable load, and is used for generating the control signal to reduce the equivalent load value of the controllable load during switching transients of the local oscillation signal.

Description

technical field [0001] The present invention relates to mixing an input signal with a local oscillator signal, and in particular to a mixer with a controllable load having reduced equivalent load value. Background technique [0002] Wireless communication devices are now widely used in various fields. Generally, each wireless communication device has a transmitter and a receiver. The transmitter is used to convert user data into radio frequency signals for data transmission, and the receiver is used to convert received radio frequency signals into user data for data transmission. take over. Whether in a transmitter or a receiver, a mixer plays an important role in transmitting / receiving RF signals. In a transmitter, a mixer mixes an input signal (either baseband or IF) with a local oscillator signal to produce the radio frequency signal to be transmitted. In the receiver, the mixer mixes the radio frequency signal received by the antenna with the local oscillator signal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03D7/14
CPCH03D7/165H03D7/1441
Inventor 赖玠玮
Owner MEDIATEK INC