| 摘要 |
A voltage controlled oscillator using a turntable active inductor is provided to implement an oscillator without a block capacitor by lowering a DC voltage connected to the active inductor by using a p-tail current source. A voltage controlled oscillator using a turntable active inductor includes a pair of CMOS transistors(M1,M2) and active inverters(L1,L2). In the CMOS transistors, a gate of one CMOS transistor is connected to a drain of the other CMOS transistor and is connected to a p-tail current source(IL). Sources of the CMOS transistors are connected to a ground through a middle tap. The active inverters are connected to a drain of each CMOS transistor. The active inverter includes a first CMOS transistor, a second CMOS transistor, and an LC tank circuit. In the first CMOS transistor, a first current source is connected between a drain and a gate. In the second CMOS transistor, a drain is connected to the gate of the first CMOS transistor. The LC tank circuit is connected between a source of the first CMOS transistor and a gate of the second CMOS transistor. |
