Homodromous orthogonal signal analog-digital converter

Abstract

The invention relates to a homodromous orthogonal signal analog-digital converter which comprises a sampling and preliminary analog / digital (A / D) switching circuit and a multiplex A / D switching circuit. The A / D switching circuit is used for conducting synchronous sampling, preliminary analog-digital conversion and allowance gain treatment respectively to analog I signals and analog Q signals of the input analog homodromous orthogonal signals. The I digital signals and the Q digital signals after synchronous outputting and preliminary analog-digital conversion output I allowance gain signals and Q allowance gain signals in an interlaced mode. The multiplex A / D switching circuit is used for conducting analog-digital conversion to the I allowance gain signals and the Q allowance gain signals in an interlaced mode. The homodromous orthogonal signal analog-digital converter achieves that the I digital signals and the Q digital signals multiplex the same analog-digital converter, reduces the circuit area of the homodromous orthogonal signal analog-digital converter and lowers power consumption of a circuit. Besides, the homodromous orthogonal signal analog-digital converter lowers even eliminates mismatch between the obtained I digital signals and the Q digital signals after analog-digital conversion.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a co-directional quadrature signal analog-to-digital converter. Background technique [0002] ADC (Analog-to-Digital Converter, analog-to-digital converter) is an essential part of communication systems and communication terminals. In the communication terminal, the ADC processes the analog signal output by the RF transceiver chip into a digital signal that the digital baseband chip can recognize, so the ADC is indispensable in the communication terminal. The radio frequency transceiver chip and the digital baseband chip are the most important chips in the communication terminal. When the radio frequency transceiver chip is working, it receives the signal in the channel and demodulates the signal into I / Q (In-phase / Quadrature, same as To quadrature) signal, the phase difference of I / Q signal is 90 degrees, and the I / Q signal is sent to ADC after analog baseband processing. [0003] C...

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Problems solved by technology

[0005] It can be seen from the above that in the prior art, since an ADC is used for the I and Q signals respectively, the area and power consumption of the analog-to-digital conversion circuit for the entire I / Q signal are relatively large, and because the I and Q signals pass through two The ADC performs data conversion, which will cause the digital I / Q signal obtained after the I / Q signal conversion does not match

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