Differential push-push voltage controlled oscillator and signal generation device

Abstract

The present invention discloses a differential push-push voltage controlled oscillator and signal generation device, comprising a quadrature oscillator, two harmonic selection elements, two frequency multiplier circuits and a power combination element. The quadrature oscillator generates two orthogonal signals and respective harmonic signals, two harmonic selection elements are used for extracting secondary harmonics in two output signals of the oscillator, generating the output of a differential push-push signal; two frequency multiplier circuits are used for frequency multiplication of the signal, generating two frequency multiplier signals with the same phase; the power combination element achieves the combination of power of two signals with the same phase, forming the output of a single-end signal source. The signal source achieves the output of a differential push-push voltage controlled oscillator by a harmonic extraction and frequency multiplication manner, increases the output frequency of signals and utilizes two orthogonal oscillation signals in connection with a power combination manner to increase the output power of signals.

Description

technical field [0001] The invention belongs to the technical field of microelectronics, and relates to a differential push-push voltage-controlled oscillator and a signal generating device. Background technique [0002] Terahertz (TeraHertz, THz) wave refers to electromagnetic waves with a frequency in the range of 0.1-10THz (wavelength 0.03-3mm), and its wave band is between microwave and far-infrared light. Terahertz wave combines many advantages of microwave and infrared light wave, and has many special properties, such as transient, broadband, coherence and good penetration, etc. Therefore, terahertz frequency band is widely used in medical imaging, high-speed wireless communication, Radar remote sensing detection, anti-terrorism anti-drug and other fields have great application prospects and unique advantages. [0003] The terahertz source is the bottleneck in the realization of terahertz applications. The terahertz source based on photonics and vacuum electronics has...

AI Technical Summary

Problems solved by technology

However, limited by the existing technology and device characteristics, the output frequency of the voltage-controlled oscillator in the solid-state terahertz source is limited, and its frequency is determined by the cut-off frequency f of the active device T Decide

In order to achieve a higher output frequency under a specific process, a voltage-controlled oscillator with a push-push structure can be used. In this structure, the output signal is the second harmonic of the oscillator oscillation signal, and the active devices in the oscillator work at The frequency of the output signal is 1 / 2, so the frequency of the output signal can be greatly increased; but the output signal of this structure is a single-ended signal, and the actual application is as the local oscillator signal of the mixer in the receiver or in the phase-locked loop The input signal of the prescaler requires a differential signal; in addition, because the output signal is the second harmonic in the oscillating signal, the power of the prescaler is small, which cannot meet the actual application requirements

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