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Transmitter, receiver and regulating method thereof

An adjustment method and transmitter technology, which are applied in the modulation and transformation balancing devices, electrical components, transmission systems, etc., can solve the problems of not explaining the two-transconductance-level transmitter, not mentioning the receiver, etc.

Inactive Publication Date: 2009-04-29
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the ISSCC paper does not explain how to adjust the two transconductance stages 305, 306 and the two baseband signal BBI t 、BBQ t The phase and amplitude of the transmitter to reduce the local oscillator leakage and in-phase / quadrature phase mismatch, and there is no mention of how to reduce the receiver's local oscillation leakage and in-phase / quadrature phase mismatch

Method used

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  • Transmitter, receiver and regulating method thereof
  • Transmitter, receiver and regulating method thereof
  • Transmitter, receiver and regulating method thereof

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Embodiment Construction

[0077] The aforementioned and other technical content, features and effects of the present invention will be clearly presented in the following detailed description of two preferred embodiments in conjunction with the accompanying drawings.

[0078] Please refer to Fig. 4, shown is a preferred embodiment of the transmitter of the present invention, comprising a compensation unit 40, two digital to analog converters 41,42, two low-pass filters 43,44, two mixers 45, 46 . An adder 47 , a detection unit 48 and an adjustment unit 49 . The compensation unit 40 is used for the two-digit baseband signal BBI t 、BBQ t Performs phase and amplitude compensation, and has multiple operating states, wherein different operating states correspond to different degrees of in-phase / quadrature phase mismatch. In this embodiment, the compensation unit 40 includes two gain stages 401 , 402 and an adder 403 . The gain stage 401 converts the baseband signal BBI t multiplied by a variable factor X ...

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Abstract

The present invention provides a method for reducing local oscillation leakage of a transmitter and a receiver or adjusting in-phase mismatch or quadrature phase mismatch and a device thereof. The method comprises detecting the degree of local oscillation leakage or in-phase mismatch or quadrature phase mismatch, and reversing an adjusting direction when the detected degree is intensified. In addition, control signals relating to local oscillation leakage or in-phase mismatch / quadrature phase mismatch are provided according to the change of adjusting direction.

Description

technical field [0001] The invention relates to a transmitter, a receiver and an adjustment method thereof, in particular to a transmitter, a receiver and an adjustment method thereof for reducing local oscillation leakage and in-phase / quadrature mismatch. Background technique [0002] Please refer to Fig. 1, Fig. 1 has shown a kind of known direct up-conversion (directup-conversion) transmitter, it comprises two digital to analog converters 11,12, two low-pass filters 13,14, two mixed frequency converters 15, 16, a totalizer 17, a power amplifier 18 and an antenna 19. Among them, the digital baseband signal BBIt is sequentially converted from digital to analog, low-pass filtered and in-phase with the local oscillator signal LOI t mixing to generate an analog in-phase RF signal RFI t , while another digital baseband signal BBQ t Then perform digital-to-analog conversion, low-pass filtering, and a quadrature-phase local oscillator signal LOQ in sequence. t frequency mixin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/30H04B1/04H03D7/14
Inventor 徐宏达林盈熙
Owner REALTEK SEMICON CORP