LC VOLTAGE CONTROLLED OSCILLATOR

摘要

PURPOSE: An LC voltage controlled generator is provided to reduce a power value in a specific offset frequency by improving the flicker noise of the LC voltage controlled generator. CONSTITUTION: An LC resonance circuit(210) comprises an inductor connected to a power terminal, a capacitor having a parallel connection with the inductor, and a variable capacitor which is connected in parallel between the inductor and the capacitor. An amplification circuit(220) includes a pair of negative boosting transistors and a pair of switching transistors. The gate node of the switching transistor is connected to a bias voltage through each resistor. A bias voltage supply circuit(230) comprises a current source and a transistor. The gate of the transistor has a constant DC voltage through a current source in the bias voltage supply circuit.