A low phase noise current controlled oscillator with the wide tuning range characteristics

摘要

The present invention relates to a low-noise LC current control oscillator having a variable bandwidth characteristic, it is connected to the power first to the fourth inductor; The first and in the second inductor are connected to the first and second transport conductors; The third and in the fourth inductor are connected to the third and fourth transport conductors; The third and fourth inductors and the first and second transformer first cone connected to the conductors 5 and 6 of transport conductors; The first and second inductors and the third and fourth transformer is connected to the conductor cone seventh and eighth conductors in trans; It said fifth and sixth transport conductors between the connection point and the ground, and the seventh and eighth are each trans-cone connection between the connection point and the ground conductors of the main current source adjustment means; And the first and the second between the connection point and the ground of the transformer conductors and includes the third and fourth are respectively connected between the connection point and the ground of the transformer conductors auxiliary current source adjustment means, to the first claim 4 transformer conductors are respectively, the frequency variable current source (I _TUNE) / 2, the current being supplied to said fifth to eighth transport conductors is (up to a frequency variable range for controlling the current source (I _mAX) - variable frequency current source ( I _TUNE)) / 2 the frequency and current of the "supply a variable current source (I _TUNE) the control by the first to fourth and the fifth in changing the trans-conductance of the transformer conductors to the eighth transport conductors the first to fourth transport cone is made to expand characterized in that the trans-conductance frequency variable range by changing the capacitance in the opposite direction of the conductors, can be controlled by the current, and to broaden the control range, low Suitable for pressure applications, it is easy to integrated.