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An X‐band push‐push oscillator with parallel feedback configuration designed by microstrip balanced bandpass filter
Author(s) -
Wang Xiang,
Zhu XiaoWei
Publication year - 2019
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21663
Subject(s) - phase noise , microstrip , dbc , band pass filter , vackář oscillator , voltage controlled oscillator , physics , electrical engineering , local oscillator , harmonic , variable frequency oscillator , topology (electrical circuits) , electronic engineering , acoustics , engineering , voltage
In this article, a push‐push oscillator with parallel feedback configuration designed by the microstrip balanced bandpass filter (BPF) is proposed. The push‐push oscillator consists of two sub‐oscillators with a balanced BPF. The balanced BPF with the open‐circuited stubs exhibits the desired differential‐mode frequency response and achieves high common‐mode suppression simultaneously. Based on the technique of the balanced BPF, the out‐of‐phase fundamental signals and odd harmonic signals are canceled out while the even harmonic signals are well combined. The prototype of the push‐push oscillator is designed and fabricated. Measured results show that the proposed push‐push oscillator works at 9.96 GHz of the second harmonic frequency. The actual output power is −8.57 dBm. The rejection of the fundamental signal and third harmonic signal are better than 27 and 42 dBc, respectively. The phase noise of the proposed push‐push oscillator is −128.3 dBc/Hz at 1 MHz frequency offset.