a mixer
A mixer and balanced converter technology, applied in the field of communication, can solve the problems of small output swing, poor flexibility, poor linearity, etc., and achieve the effect of improving linearity, not easy to distort, and improving flexibility
Active Publication Date: 2019-04-12
成都通量科技有限公司
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Problems solved by technology
However, the traditional mixer has poor linearity, small output swing, and high power consumption when the gain is high. Therefore, the traditional mixer has poor flexibility in monitoring the target and cannot better meet the system requirements.
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[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0027] The purpose of the present invention is to provide a kind of mixer, by designing transconductance level circuit, active load circuit and using common source amplifier as buffer stage, thereby improving the linearity of mixer, increasing the output swing, improving the gain Power consumption has been reduced to increase the mixer's flexibility in monitoring targets to meet system requirements.
[0028] In order to make the above objects, features and adv...
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The invention discloses a frequency mixer which comprises N-channel type field effect transistors N1 to N6, baluns T1 and T2, and P-channel type field effect transistors P1 and P2. One end of the balun T1 is connected with the grid of the N1 and the grid of the N4, and the other end of the balun T1 is connected with the grid of the N2 and the grid of the N3; one end of the balun T2 is connected with the source of the N1 and the source of the N2, and the other end of the balun T2 is connected with the source of the N3 and the source of the N4; the P1 is connected with the drain of the n1 and the drain of the N3, and P2 is connected with the drain of the N2 and the drain of the N4; the N5 is connected with the drain of the n1 and the drain of the N3; and the N6 is connected with the drain of the N2 and the drain of the N4. The frequency mixer of the invention can improve the linearity effectively, increase the output amplitude, improve the power gain, reduce the power consumption, and further improve the object monitoring flexibility and satisfy system requirements.
Description
technical field [0001] The invention relates to the communication field, in particular to a mixer. Background technique [0002] The mixer is the last stage of the radio receiver. Its function is to mix the signal received on the antenna with the signal generated by the local oscillator. It is mainly used in the down-mixing of automotive millimeter-wave radar. In the automotive millimeter-wave radar system structure, the baseband ADC sampling circuit follows the mixer, so there is a high requirement for the linearity of the mixer. [0003] Traditional mixers adopt a simple balanced or double-balanced structure. When the output signal of the mixer is not distorted, the useful signal can be sampled and demodulated to detect the accurate position of the target. In practical applications, due to the uncertainty of the distance and size of the monitoring target, the mixer is required to have a wide input range and high linearity. However, the traditional mixer has poor linearit...
Claims
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IPC IPC(8): H03D7/14
CPCH03D7/1441H03D7/1491
Inventor 康凯卢伟强赵晨曦刘辉华
Owner 成都通量科技有限公司