Current starved inverter voltage controlled oscillator

A ring oscillator comprising a plurality of stages connected in tandem, each stage of said plurality of stages providing a frequency response and having:

• i. a digital input terminal,
• ii. an inverter having an input, an output and a feedback connection from said output to said input, and
• iii. an anti-high-gain circuit coupled to said inverter,
• wherein one of said plurality of stages is actuated in response to a digital control signal at said digital input terminal and said frequency response of the actuated stage is adjusted in response to an analog control signal.

A voltage-controlled ring oscillator comprising a plurality of stages connected in tandem, each stage of said plurality of stages having:

• i. an input terminal,
• ii. an output terminal,
• iii. a first current source, a second current source, a third current source, and fourth current source,
• iv. an inverter having a high-voltage node, a low-voltage node, an inverter input, an inverter output and a feedback connection from said inverter output to said inverter input, said first and second current sources coupled to said high-voltage node and said third and fourth current sources coupled to said low-voltage node,
• v. a three-state select circuit coupled to said inverter and coupled to said input terminal,
• wherein a first control signal actuates one of said plurality of stages and a second control signal adjusts a frequency response of the actuated stage.