Abstract
This paper proposes an oscillator based on a deformed structure parallel coupled line filter design. The requirements of this design are the output power meet 10dBm, and phase noise is below -90dBc/Hz at 10kHz off the centre point. This work adopts parallel positive feedback form, and it use Parallel Coupled Line Filter, making this design simple in structure and low in cost. This design has low phase noise and high output power features, working at 2.4GHz, intended to use in a through-the-wall radar system.
Highlights
As an important part of microwave circuit system, the oscillator is one of the most exploited and ubiquitous modules in Radio Frequency Integrated Circuit (RFIC) systems which have to comply with stringent requirements
In order to reduce the influence of phase noise, the minimum noise matching is used at the input matching end, that is, the impedance value of the system at the minimum noise figure is used as the input impedance of the low noise amplifier
While in order to achieve high output power, the maximum gain matching is used at the output of the low noise amplifier, that is, the impedance value of the theoretical maximum gain at the selected bias point is used as the output impedance, and the load impedance 50 is matched to the conjugate of the output impedance
Summary
As an important part of microwave circuit system, the oscillator is one of the most exploited and ubiquitous modules in Radio Frequency Integrated Circuit (RFIC) systems which have to comply with stringent requirements. Phase noise and harmonic suppression are critical parameters of an oscillator [1]. Many research working on the low phase noise oscillators and their behavior has been down [2,3,4,5]. The electromagnetic simulation (EM simulation) compares the layout of the analog circuit on the dielectric substrate and the result of the component package with parasitic parameters to obtain simulation data that is closer to the actual situation. This paper proposes an oscillator which has low phase noise and high output power, working at 2.4GHz, intended to use in a through-the-wall radar system. This paper will introduce the design of the oscillator from two aspects, low noise amplifier and parallel coupled line filter. Analyze the results of EM and schematic co-simulation and discuss about the results of it
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