Enhanced architectures of voltage-controlled oscillators with single inductor (vco-1l)

Abstract

Methods to achieve low power consumption, high output amplitude and an improved high frequency stability, and high speed for voltage-controlled oscillators are disclosed These methods includes to provide a current mirror, a power supply voltage Vdd, two single-ended outputs, a lower layer of gain providing structure comprising cross-coupled transistors, an upper layer of gain providing structure, a control voltage, a pair of capacitors to block a DC-connection to the gates of said cross-coupled transistors, a pair of resistors, and an LC-tank. Important steps of these methods include to set the time instances when said transistors of lower layer of gain providing structure open and close, to shut-down the transistors of lower layer of gain providing structure as soon as the energy required to keep the oscillations in said LC-tank is secured, to add additional gain in the amplification loop; and to pump-out charges of the channels of said transistors of said lower layer gain providing structure.