Injection locked oscillation circuit based on ring coupler and injection locked oscillator

Abstract

The embodiment of the invention belongs to the technical field of radio frequency, and provides an injection locked oscillation circuit based on a ring coupler and an injection locked oscillator. A single-ended reference frequency signal is converted into a corresponding positive-end differential signal and a corresponding negative-end differential signal through the ring coupler module, and the reference frequency signal is injected into a buffer module through the signal injection module, so that the buffer module outputs a corresponding oscillation feedback signal. The oscillation feedbacksignal is used for locking the frequency of an initial oscillation signal generated by a resonance loop module into a frequency range set by the reference frequency signal source, and then an output matching module is used for receiving the buffer isolation oscillation signal outputted by the buffer module, and the second harmonic output of the buffer isolation oscillation signal is subjected to energy enhancement processing to output a corresponding oscillation output signal, so that the phase error of the two differential signals injected by the signal injection module is reduced, the insertion loss is reduced, and the frequency locking range of the injection locking oscillation circuit is increased.

Description

technical field [0001] The embodiments of the present application belong to the field of radio frequency technology, and in particular relate to an injection-locked oscillation circuit and an injection-locked oscillator based on a ring coupler. Background technique [0002] At present, with the development of millimeter wave and terahertz technology, millimeter wave and terahertz have broad application prospects in the fields of communication, electronic countermeasures, radar, electromagnetic weapons, astronomy, medical imaging, nondestructive testing, environmental monitoring and safety inspection. . As a key component of millimeter-wave and terahertz application technologies, oscillators have also received great attention from researchers. Due to the high operating frequency of terahertz frequency source chips, the parasitic capacitance introduced by injection transistors will often greatly reduce the output of the circuit. Frequency, so the differential injection signal...

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Problems solved by technology

[0004] The embodiment of the present application provides an injection-locked oscillator circuit and an injection-locked oscillator based on a ring coupler, aiming to solve the problem that when the frequency of the signal exceeds 100 GHz, it often exceeds the self-resonant frequency of the on-chip balun, and the on-chip balun output The phase of the differential signal is distorted, and the amplitude is also distorted, which greatly reduces the problem of injection locking the locking range of the terahertz frequency source

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