Unlock instant, AI-driven research and patent intelligence for your innovation.

A Receiver DC Processing Method Compatible with Wide and Narrow Band Signals

A processing method and receiver technology, applied in the field of communication, can solve the problems of affecting the signal-to-noise ratio and low configurability, and achieve the effect of reducing noise

Active Publication Date: 2020-09-11
杭州城芯科技有限公司
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there is an inherent defect in the zero-IF receiver. Since the local oscillator signal is the same as the radio frequency signal, DC interference and low-frequency noise are within the signal band, and DC processing is required to avoid affecting the signal-to-noise ratio of the final baseband reception.
At present, the zero-IF receivers in the prior art can only perform noise reduction for narrow-band received signals, and the configurability is not high, so it is difficult to meet the needs of multiple modes and function upgrades on a single chip of the receiver.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Receiver DC Processing Method Compatible with Wide and Narrow Band Signals
  • A Receiver DC Processing Method Compatible with Wide and Narrow Band Signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 As shown, a receiver compatible with wide and narrowband signals provided by the embodiment of the present invention includes: a frequency source 2, a quadrature mixer, a bandwidth configurable filter, a DC correction circuit, a DC offset elimination loop, and an analog-to-digital conversion and digital processing modules, where:

[0037] The frequency source 2 is connected with the quadrature mixer for generating local oscillator signals. The frequency of the local oscillator signal generated by the frequency source 2 can be set as required.

[0038] The quadrature mixer includes an I-way radio frequency mixer 1 and a Q-way radio frequency mixer 4, both of which are connected with an externally input radio frequency signal and a frequency source 2, and are used to provide an externally input radio frequency signal and a frequency source 2 The local oscillator signal is mixed to generate I and Q signals respectively. Preferably, the local oscillator ...

Embodiment 2

[0054] Embodiment 2 provides a receiver DC processing method compatible with wide and narrowband signals, using the receiver compatible with wide and narrowband signals as described in any of the above implementation modes, specifically including the following steps:

[0055] (1) Determine the working mode of the receiver, which includes wideband receiving mode and narrowband receiving mode;

[0056] (2) Configure the receiver in broadband receiving mode, close the DC offset elimination loop, the digital processing module detects the output of the analog-to-digital converter and inputs it into the DC correction circuit, and corrects the DC offset through the DC correction circuit before receiving the RF signal. After the calibration is completed and the RF signal is received, the DC calibration circuit will not change;

[0057] (3) Configure the receiver in the narrowband receiving mode, turn off the DC correction circuit, and remove the DC offset through the DC offset elimina...

Embodiment 3

[0064] The third embodiment is basically the same as the second embodiment, and the similarities will not be repeated. The difference lies in:

[0065] In this embodiment, the bandwidth of the I-channel RF mixer and the Q-channel RF mixer is designed to be 2 MHz to 20 MHz, and 8 bits are configurable; the NCO input reference frequency of the digital oscillator is 25 MHz, and the precision is designed to be 32 bits. The accuracy of the I-channel DC offset correction DAC and the Q-channel DC offset correction DAC is designed to be 6bit, and the calibration range is designed to be -8mV~7mV. The high-pass cutoff point of DCOC is designed to be 100kHz.

[0066] When the frequency of the input RF signal is 800MHz and the bandwidth is 5MHz, confirm that the working mode is broadband receiving mode in step (1), and configure the receiver as follows in step (2):

[0067] 1. The bandwidth of the filter can be configured with a filter bandwidth of 5MHz, the local oscillator frequency of...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention relates to the communication field, and in particular to a receiver DC processing method compatible with wide and narrowband signals. The receiver includes a frequency source, a quadrature mixer, a bandwidth configurable filter, a DC correction circuit, a DC offset elimination loop, The analog-to-digital converter and digital processing module, when receiving wideband, can use the DC correction circuit to correct and remove the DC offset before receiving the RF signal normally; when receiving the narrowband, the DC offset elimination loop can be used to suppress the DC during the normal reception of the RF signal Interference / low-frequency noise, realizing wide-range wide-narrowband signal high SNR reception compatible with kHz~MHz bandwidth.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a receiver compatible with wide and narrowband signals and a direct current processing method thereof. Background technique [0002] In a communication system, an on-chip integrated zero-IF receiver is usually composed of a low-noise amplifier (LNA), a quadrature mixer (Qmixer), a low-pass filter (LPF), and an analog-to-digital converter (ADC). The amplifier amplifies the input RF signal to reduce the impact of the subsequent stage on the signal-to-noise ratio; the quadrature mixer mixes the RF signal with the local oscillator signal to generate two zero-IF signals of I and Q; the low-pass filter filters out the band External interference, while providing a certain gain to amplify the signal within the dynamic range of the ADC; the ADC converts the signal into a digital signal and submits it to the subsequent baseband chip for processing. The receiver of the zero-IF archi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/30H04B1/10
CPCH04B1/10H04B1/30H04B2001/305
Inventor 李国儒
Owner 杭州城芯科技有限公司