Terahertz active frequency tripler based on InP technology

Abstract

The invention discloses a terahertz active frequency tripler based on an InP process. The terahertz active frequency tripler comprises an input circuit, a terahertz transistor frequency doubling circuit and an output circuit which are connected in sequence, the input circuit comprises an input GSG probe, an input matching circuit and an input idle circuit which are connected in sequence, and the output circuit comprises an output fundamental wave idle circuit, an output second harmonic idle circuit, an output matching circuit and an output GSG probe which are connected in sequence. The input idle circuit, the output fundamental wave idle circuit and the output second harmonic idle circuit form a band elimination filter, and the fundamental wave idle circuit forms a fundamental wave band elimination filter. The output circuit does not need to design a separate triple frequency band pass coupling filter or high pass filter, The utilization efficiency of input fundamental waves is improved, the loss of output triple frequency is reduced, and the frequency multiplication efficiency of a frequency multiplier is effectively improved. In addition, the whole frequency multiplier circuit adopts a single-stage common-source transistor circuit, is designed based on an InP process, and has better frequency and power characteristics.

Description

Technical field [0001] The present invention relates to the field of millimeter wave communication technology, and more particularly to an INP process-based terahertz active triplexer. Background technique [0002] Taohertz communication technology is a potential key technique for 6G communication in the future. In the millimeter wave and the terahertz communication system, the terahertz signal is obtained by using a low-frequency source driven chain link to obtain a common method. [0003] For the multiplier, the input signal is a sinusoidal signal V. in = V 0 Cosw 0 T, the output current is: [0004] [0005] It can be seen from the above in the formula that a large number of harmonic components and DC components are included in the output signal, and after the output circuit matches, the required signal is filtered by the circuit structure, which reflects the signal, which in turn increases. efficient. [0006] The passive multiplier implemented by Schottky diode does not co...

AI Technical Summary

Problems solved by technology

On the other hand, compared with the double frequency design, the triple frequency difficulty is more difficult in the design of the output filter structure; if a quarter-wavelength open-circuit parallel transmission line of the fundamental wave is used to realize the fundamental wave reflection, the parallel connection The equivalent input impedance is Z in_eff = Z in / / Z in1 / 4 , where Z in1 / 4 =-jZ 0 cotβL≈0(L=λ / 4), due to the periodicity of the cot function, at the fundamental and third harmonic frequencies, Z in1 / 4 are close to zero, that is, Z in_eff It is also close to zero, and the required third harmonic will also be filtered out. The function of the fundamental wave idle loop in the triple frequency circuit cannot be realized by using the traditional microstrip stub reflection.

At the same time, half-wavelength parallel-coupled band-pass filters and high-pass filters are often used as output filters for triple frequency, but the circuit size is large and will cause large power loss

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