Digital AGC circuit of multimode GNSS receiver

A receiver, multi-mode technology, used in electrical components, amplification control, radio wave measurement systems, etc., can solve problems such as signal loss, and achieve the effect of improving speed, good adaptability and high efficiency

Inactive Publication Date: 2017-06-20
魏莹
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In the navigation GNSS (Global Navigation Satellite System) receiver, the satellite signal is attenuated by the atmospheric environment, and the actual signal power received by the antenna is much smaller than the system noise power. Changes in a large dynamic range. For an analog-digital converter ADC (Analog-Digital Converter) with limited precision and amplitude range, direct analog-to-digital conversion of the received signal will cause a large signal loss

Method used

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  • Digital AGC circuit of multimode GNSS receiver
  • Digital AGC circuit of multimode GNSS receiver
  • Digital AGC circuit of multimode GNSS receiver

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with drawings and embodiments.

[0016] like figure 1 , In the PGA structure circuit, R4 is a fixed resistor. It can be seen from the IF response that R1 determines the gain range, reducing R1 will increase the gain, otherwise it will decrease the gain. The function of RD is to stabilize the frequency parameter, and its pole distribution can be easily obtained from the transfer function of PGA. It is easy to know by analyzing its pole distribution. If there is no RD, the smaller R1 will make the gain larger and the frequency bandwidth will be reduced at the same time, which will make the frequency performance worse. Adding RD as a frequency compensation resistor and R1 linkage adjustment makes R1 change. Stable frequency bandwidth. The range and precision of PGA gain adjustment are mainly determined by the values ​​of R1 and RD, so the value range and discrete interval of R1 and RD need to be carefu...

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Abstract

A digital AGC circuit of a multi-mode GNSS receiver is applicable to the navigation field. The digital AGC circuit consists of three parts: PGA, AGC and ADC. The I/Q two-way PGA share the same gain control signal, which can be generated by AGC or configured by software through the SPI interface; the ADC adopts a Flash structure to meet high-speed conversion requirements. The AGC circuit monitors and counts the ADC output signal in real time, obtains the PGA control signal to control the gain of the input I/Q signal, outputs the amplified analog signal, and obtains a digital output after analog-to-digital conversion. The circuit structure is compact, the gain adjustment speed is fast, the gain convergence is fast, the circuit operation is stable, the adaptability is good, the power consumption of the circuit is reduced, and the efficiency is high.

Description

[0001] Technical field [0002] The invention relates to a digital AGC circuit of a multi-mode GNSS receiver, which is applicable to the navigation field. Background technique [0003] Low power consumption, small size portable navigation equipment is the mainstream trend of the development of navigation receivers today. In the navigation GNSS (Global Navigation Satellite System) receiver, the satellite signal is attenuated by the atmospheric environment, and the actual signal power received by the antenna is much smaller than the system noise power. Changes in a large dynamic range. For an analog-digital converter ADC (Analog-Digital Converter) with limited precision and amplitude range, directly performing analog-digital conversion on the received signal will cause a large signal loss. The common practice is to add an automatic gain control circuit AGC (Automatic Gain Control) to adaptively adjust the signal power so that the signal input by the ADC is within the dynamic ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/13H03G3/20
CPCG01S19/13H03G3/20
Inventor 魏莹
Owner 魏莹
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