Fundamental wave current elimination method for harmonic generation frequency multiplier

Abstract

The invention discloses a fundamental current elimination method for a harmonic generation frequency multiplier, and belongs to the technical field of integrated circuits. According to the invention, a harmonic generation frequency multiplier architecture and a differential signal input driving device are adopted, the harmonic generation frequency multiplier works under different conduction angle biases, a transistor of the harmonic generation frequency multiplier is driven by a differential signal, the generated fundamental current is inverted, and the size proportion of the transistor is adjusted, so that the output fundamental component amplitudes are equal; and when the output ends of the transistors working under different biases are connected, the fundamental current is counteracted, so that the fundamental current of the harmonic generation frequency multiplier is eliminated. According to the frequency multiplier, a high-Q-value filter limiting the working bandwidth of the frequency multiplier is avoided, so that the frequency multiplier has excellent broadband performance.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, relates to broadband frequency multiplier technology, and in particular to a method for eliminating fundamental wave current of a harmonic generation frequency multiplier. Background technique [0002] A frequency multiplier is a circuit that makes the output signal frequency equal to an integer multiple of the input signal frequency. If the input frequency is Fin, the output frequency is Fout=n*Fin, and the coefficient n is called frequency multiplication, which can be any positive integer. The frequency multiplier has a wide range of uses, such as the transmitter can make the main oscillator oscillate at a lower frequency to improve frequency stability; the frequency multiplier is used to increase the frequency offset in the frequency modulation equipment; Among them, the frequency multiplier is an important component of the carrier recovery circuit. For systems working in higher ...

AI Technical Summary

Problems solved by technology

The frequency multiplier generated by harmonics has the advantages of simple structure and easy design. It only needs to reduce the Q value of the frequency selection network to obtain broadband performance. However, the frequency conversion efficiency of the harmonic generated frequency doubler is low and the harmonic performance is not good. , especially the corresponding fundamental wave signal, will often bring great interference to the subsequent circuit

The injection-locked frequency multiplier has the advantages of high conversion efficiency and low DC power consumption, and because the injection-locked frequency multiplier itself is an oscillator, the harmonic performance is better, but also because the injection-locked frequency multiplier is an oscillator, so Bandwidth is limited and designs are more complex

[0005] Broadband frequency sources have a wide range of application scenarios. For example, broadband frequency sources are beneficial to radar frequency scanning accuracy. Larger bandwidths can obtain finer distance resolution. The frequency multipliers of the above two architectures are due to their own Working principle limits its working bandwidth

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