LC oscillator with low phase noise and broadband tuning range

摘要

A voltage controlled oscillator having a capacitive circuit (610), and an inductor, an active oscillator circuit (600) is disclosed. And then turned on and off selectively the capacitive circuit to control the frequency of the voltage controlled oscillator (600). In particular, inductors and capacitors of the capacitive circuit to form an LC circuit to provide feedback active oscillator circuit (610). In order to avoid damage to the switch of capacitive circuit, capacitive circuit further includes a resistor (622). The configured in several different ways the resistance of these results, it can be a voltage controlled oscillator (600), to have a wide tuning range with the phase noise performance of certain reliability and high.