Transmitting and receiving circuit and method for controlling the receiving circuit

Abstract

The invention relates to a transmitting and receiving circuit and a receiving circuit control method. The transmitting and receiving circuit includes a transmitting circuit, a receiving circuit, a frequency domain analysis circuit and a DC bias generation circuit, wherein the receiving circuit includes a mixer. The transmitting circuit transmits a test signal, the mixer of the receiving circuit receives a plurality of predetermined DC bias groups, and when the mixer is operated on the predetermined DC bias groups, the receiving circuit is configured to form a plurality of output signals according to the test signal; the frequency domain analysis circuit converts the output signal into a plurality of frequency domain signals; and the DC bias generation circuit generates a function accordingto the plurality of frequency domain signals and the predetermined DC bias groups, and generates a first DC bias group for the mixer according to the function.

Description

technical field [0001] The present invention relates to a transmitting and receiving circuit and a control method of a receiving circuit, in particular to a transmitting and receiving circuit and a control method of a receiving circuit capable of reducing noise. Background technique [0002] In the known transmitting and receiving circuits, the signal transmitted by the transmitting circuit may cause noise to the receiving circuit. Some of the noise is originally out-of-band, but due to the second-order nonlinear effect of the receiving circuit, the out-of-band noise is coupled into the in-band, resulting in in-band noise. [0003] Therefore, the related art proposes some methods to solve this problem. For example, the above-mentioned problem can be improved by adjusting the DC bias voltage of the mixer in the transmitting and receiving circuit. However, the traditional method is usually a binary search method to gradually calculate the DC bias voltage of the suitable mixer...

AI Technical Summary

Problems solved by technology

For example, the above-mentioned problem can be improved by adjusting the DC bias voltage of the mixer in the transmitting and receiving circuit. However, the traditional method is usually a binary search method to gradually calculate the DC bias voltage of the suitable mixer, which does not provide The mechanism to quickly calculate the DC bias voltage of the mixer, so it takes a lot of computing time and cost to calculate the appropriate DC bias voltage

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