Amplifying, mixing and filtering device for GNSS (global navigation satellite system) receiving set

A filtering device and receiver technology, applied in measuring devices, radio wave measuring systems, instruments, etc., to achieve the effects of reducing power consumption, alleviating large power consumption, and reducing gain requirements

Active Publication Date: 2013-08-14
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention mainly solves the technical problems existing in the prior art; provides a low-noise amplifier and a mixer circuit that can greatly reduce the power consumption of the radio frequency front end of the GNSS receiver, and can make the circuit meet the performance

Method used

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  • Amplifying, mixing and filtering device for GNSS (global navigation satellite system) receiving set
  • Amplifying, mixing and filtering device for GNSS (global navigation satellite system) receiving set
  • Amplifying, mixing and filtering device for GNSS (global navigation satellite system) receiving set

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Embodiment

[0028] The specific implementation method of the present invention will be described below in conjunction with the accompanying drawings.

[0029] figure 1 is the circuit topology diagram of the present invention, such as figure 1 As shown, a low noise amplifier, a mixer and a mixer for a GNSS receiver include a low noise amplifier circuit 101 , an I, Q two-way mixer circuit 102 , and a polyphase filter circuit 103 .

[0030] LNA 101 employs a differential input, figure 1 Among them, RFin+, RFin- are the differential input signals of the low noise amplifier 101, and RFout+, RFout- are the differential output signals of the low noise amplifier 101. B0,1 is the digital gain control signal of the low noise amplifier 101 .

[0031] The mixer circuit 102 realizes the quadrature demodulation of the signal, figure 1 Among them, LO, I+, LO, I-, LO, Q+ and LO, Q- are four-phase quadrature local oscillator signals required for frequency mixing, figure 1Among them, IF0, I+, IF0, I-,...

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Abstract

The invention relates to an amplifying, mixing and filtering device for a GNSS receiving set. The amplifying, mixing and filtering device comprises a high gain and gain controllable low noise amplifier, a passive orthogonal mixer assembly and a multi-phase filter which are sequentially connected. The device adopts the novel low noise amplifier which adopts a current source load, so that the gain is increased greatly, and the gain controllable function is realized. Simultaneously, compared with a conventional lower noise amplifier with an inductive load, the manufacturing cost is reduced substantially due to the fact that the low noise amplifier doesn't comprise a load inductor with a larger chip area. Due to the high gain of the low noise amplifier, the noise margin of a circuit to a post-module is increased, so that two later orthogonal demodulation mixers of the circuit can adopt the passive frequency mixer and the multi-phase filter which are free of current consumption, and the power consumption is reduced. By means of the high gain and gain adjustable function of the circuit, the design requirement of the post-module is reduced, and the overall power consumption is further reduced.

Description

technical field [0001] The invention relates to an amplification, frequency mixing and filtering device, in particular to an amplification, frequency mixing and filtering device for a GNSS receiver. Background technique [0002] Global Navigation Satellite System (GNSS) is widely used in positioning and navigation, timing frequency comparison, high-precision measurement and monitoring of ships, automobiles, aircraft and other moving objects. At present, with the popularization of mobile terminals and the development of location-based services, GNSS is widely used in mobile terminals such as mobile phones and tablet computers. This type of mobile terminal is powered by batteries. In order to improve battery life, it is of great significance to reduce the power consumption of the radio frequency front-end part of its wireless system. The design and implementation of high-performance and low-power radio frequency integrated circuits is an important means to solve this problem....

Claims

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Application Information

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IPC IPC(8): G01S19/36
Inventor 江金光魏斌斌
Owner WUHAN UNIV
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