Oscillator

摘要

An oscillator used in RF system. The oscillator includes a pair of transistors to which source terminals are interconnected and to which drain and gate terminals are coupled by a positive feedback loop comprising an oscillator tank, wherein the source terminals of the transistors are connected to a current source configured to control physical parameters of the oscillator.

主权项

1. An oscillator, comprising:
a pair of transistors to which a plurality of source terminals are interconnected and to which a plurality of drains and a plurality of gate terminals are coupled by a positive feedback loop comprising an oscillator tank, wherein the source terminals of the transistors are connected to a current source configured to control physical parameters of the oscillator, wherein an oscillation frequency of the oscillator is determined by an input impedance of the oscillator tank comprising step-up transformers and tuning capacitances, wherein a plurality of primary terminals of a first transformer are connected to drain terminals of the transistors, wherein a plurality of secondary terminals of the first transformer are connected to a plurality of intermediate nodes, wherein the intermediate nodes are common between the secondary terminals of the first transformer and the primary terminals of a second transformer, wherein the primary terminals of the second transformer are connected to the intermediate nodes, wherein the secondary terminals of the second transformer are connected to the gate terminals of the transistors, wherein a turns ratio of the first transformer is 1:n1, wherein a turns ratio of the second transformer is 1:n2, and wherein n is a positive integer.