Zero intermediate frequency receiver and direct current leakage suppression method thereof

Abstract

The invention discloses a zero intermediate frequency receiver and a direct current leakage suppression method thereof. The zero intermediate frequency receiver direct current leakage suppression method includes: respectively grabbing I route data and Q route data output by a digital-to-analogue conversion (DAC) chip, then respectively computing weighted average values of the grabbed I route data and Q route data to obtain direct current leakage rectifying differences of the I route and the Q route, subtracting respective direct current leakage rectifying differences from the received I route data and Q route data, and namely finishing direct current leakage rectifying of the I / Q data. The rectifying difference values are calculated according to received data in real time and the real-time received data is rectified according to the rectifying difference values, so that the zero intermediate frequency receiver and the direct current leakage suppression method thereof are strong in real time, and the rectifying method is simple and effective.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a zero-IF receiver and a DC leakage suppression method thereof. Background technique [0002] The zero-IF receiver has the advantages of small size, low cost, and easy monolithic integration. It has become a very competitive structure in radio frequency receivers and has received extensive attention in the field of wireless communication. However, the problem of DC leakage has become a limitation for zero-IF receivers. Barriers to the application of IF receivers. DC leakage directly affects signal demodulation, especially for WCDMA and CDMA2000 signal demodulation. In addition, the DC leakage problem will also affect the spurious indicators in the LTE small signal band. [0003] The zero-IF modulator in the uplink of the zero-IF receiver has a DC leakage suppression function, but it can only suppress the DC leakage to about -40dbm, which is far from the upstream ...

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Problems solved by technology

In addition, the DC leakage problem will also affect the LTE small signal in-band spurious index

[0003] The zero-IF modulator in the uplink of the zero-IF receiver has a DC leakage suppression function, but it can only suppress the DC leakage to about -40dbm, which is far from the upstream noise floor requirement of -120dbm

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