Patent ID: 6107893
Filing Date: 2000-08-22
Classification: H03B

Abstract:
A monolithic voltage controlled oscillator comprising:an integrated circuit substrate including silicon;a synthetic inductance formed on the substrate and having first and second power supply terminals and a port presenting a frequency-dependent admittance having an inductive component and a positive real component, the synthetic inductance including an amplifier configured to provide nearly unity gain, a high input impedance and a low output impedance, the amplifier having an output coupled to the port and an input; andan active admittance transformation network formed on the substrate and coupled to the synthetic inductance and the port, the active admittance transforming network transforming the positive real component to a negative real component, the active admittance transforming network and the synthetic inductance cooperating to produce an oscillator, the active admittance transformation network comprising:a transistor having a control electrode coupled to a power supply node of the amplifier, a first power electrode coupled to a power supply and a second power electrode coupled to the input; anda phase shift network coupled between the gate and the power supply.