| 摘要 |
PURPOSE: A low noise current controlled oscillator having wide band variation characteristic is provided to enable a wide band variation at a low voltage on maintaining a low noise characteristic that an L-C oscillator has the same characteristic by improving the oscillator structure. CONSTITUTION: The first through fourth inductors(L1 to L4) are coupled to a power source(VDD), respectively. The first and second transconductors(M1,M2) are coupled to the first and second inductors(L1,L2), respectively, while the third and fourth transconductors(M3,M4) are coupled to the third and fourth inductors(L3,L4), respectively. The fifth and sixth transconductors(M5,M6) are coupled to the third and fourth inductors(L3,L4) and the first and second transconductors(M1,M2), respectively. The seventh and eighth transconductors(M7,M8) are coupled to the first and second inductors(L1,L2) and the third and fourth transconductors(M3,M4). A main current source adjustment element(VB1) is coupled with between a node of the fifth and sixth transconductors(M5,M6) and a ground and between a node of the seventh and eighth transconductors(M7,M8) and the ground. A subsidiary current source adjustment element(VB2) is coupled with between a node of the first and second transconductors(M1,M2) and the ground and between a node of the third and fourth transconductors(M3,M4) and the ground.
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