Signal polarity detection device and associated method

Abstract

The invention discloses a signal polarity detection device and method. The signal polarity detection device includes: a first comparison device, a second comparison device and an arithmetic unit. The first comparison device is used to respond to a first time period Comparing a first signal with a first threshold signal with a second period to output a first output signal; the second comparison device is used for comparing a second signal with a second threshold signal to output a third output signal, which changes the polarity of the third output signal corresponding to the first period and the second period; A polarity data of the second signal product.

Description

technical field [0001] The invention relates to a signal polarity detection device and method, especially a detection device and method for detecting the multiplicative polarity of two input signals. Background technique [0002] Quadrature Signals (Quadrature Signals) I / Q generation has been widely used in various wireless signal transmissions, and can be implemented with a quadrature down-conversion mixer or a polyphase filter. In non-zero-IF receiver architectures, quadrature signal I / Q is important for post-frequency conversion image signal cancellation; in zero-IF receiver architectures, quadrature signal I / Q can be used in noncoherent demodulation (noncoherent demodulation). As shown in the block diagram of the wireless signal receiving end in Figure 1, after the radio frequency wireless signal RF is received by the antenna 10, it is multiplied by the sinusoidal signal Sinωt and the Cosωt signal respectively, and then demodulated to generate an in-phase (In-phase) sig...

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Problems solved by technology

[0007] However, the image signal rejection ratio (IRR) of 30dB to 35dB can no longer meet the application of today's wireless radio frequency signal receivers (radio receiver). For example, the image signal rejection ratio (IRR) requirements of terrestrial TV receivers have been reduced. Up to 60dB

As can be seen from Figure 2, in order to achieve an image signal rejection ratio (IRR) of 60dB, ΔA / A and θ need to be kept under a gain mismatch of 0.01dB and a phase mismatch of 0.1 degrees, respectively, and without In the case of any correction circuit, the above conditions are difficult to achieve in the analog signal domain

[0008] Therefore, some correction techniques such as the following [1] to [6] reference data have been developed to compensate the imbalance between the analog signal I and the signal Q, but the offset of the components themselves will affect the result of the correction, so it is necessary to develop A Solution for Accurately Detecting Gain Imbalance and Phase Imbalance with Improved Rejection Ratio

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