Voltage controlled oscillator circuit

摘要

The conventional voltage controlled oscillator circuit has a limitation in the range of the capacitance change of the MOS transistor, and has a problem in that the variable range of frequency is narrow with respect to the amount of change in the control voltage.The voltage controlled oscillator circuit 1 has a first transistor Tr1, a second transistor TR2, an inductive impedance element L1, a first variable capacitive impedance element CV1, and a second variable capacitance impedance element CV2.The first variable capacitive impedance element CV1 has a capacitance transistor TR11, a resistor R11, a capacitor C11, and a capacitor C12.The second variable capacitance impedance element CV2 has a capacitance transistor tr21, a resistor R21, a capacitor C22, and a capacitor C21.Diagram