Receiving device of communication system

Abstract

The invention relates to a receiving device of a communication system, which comprises a receiving module, a selection unit and a processing module, wherein the receiving module receives an input signal to generate a first signal and a second signal; the first signal and the second signal have different phases; the selection unit is coupled with the receiving module to switch to output the first signal or the second signal; and the processing module is coupled with the selection unit to process the first signal and the second signal so as to generate an output signal. Therefore, according to the receiving unit, the selection unit processes two phase signals by one group of channels to reduce circuit area and save power consumption so as to achieve the purpose of saving cost.

Description

technical field [0001] The present invention relates to a receiving device, in particular to a receiving device of a communication system. Background technique [0002] In the radio frequency transmission architecture of today's wireless communication systems, there are two mainstream receiver architectures that can achieve high integration and multi-mode, one is a low intermediate frequency (Low IF) receiver, and the other is a direct conversion (Direct Conversion). ), or a zero-IF receiver, the advantages and disadvantages of the two have their pros and cons, and both have been widely valued and applied in the industry. The former can avoid the problems of DC offset and low-frequency noise, but suffers from the interference of the image signal (Image Signal). The latter, on the other hand, has less problems with image signal interference, but suffers from DC offset and low frequency noise. [0003] Today, the low-IF architecture has been widely used in the transmission a...

AI Technical Summary

Problems solved by technology

The most common practice at this stage is to use a set of mixing circuits to down-frequency the RF signal and output a pair of mutually orthogonal signal, and then use a complex filter (Complex Filter) architecture to process the pair of signals, that is, the architecture of a general image rejection receiver (image rejection receiver, Image rejection receiver) is all from a low noise amplifier (Low Noise Amplifier, LNA ) from the output end of the mixer, filter, amplifier and analog-to-digital converter to the output end of the baseband processing circuit, all of which are divided into two-phase signals, namely 0 degree (In-phase, I) and 90-degree (Quadrature, Q) two-way signal, so it means that two sets of mixers, filters, amplifiers, and analog-to-digital converters are required. In this way, not only is the circuit area and power consumption wasted, but it is even more likely It will make the asymmetry between the I signal and the Q signal larger

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