Voltage controlled oscillator including voltage controlled delay circuit with power supply noise isolation

A voltage controlled delay circuit with power supply noise isolation, comprising:

• delay means responsive to an input voltage for varying the delay of a pair of signals propagating through said delay means, and
• a transistor having a drain connected to a power supply, a gate connected to a control voltage, and a source providing said input voltage to said delay means such that said input voltage follows said control voltage and is isolated from noise on said power supply connection to said transistor.

In a voltage controlled oscillator, a ring oscillator comprising:

• a plurality of delay means responsive to an input voltage for varying the delay of a signal propagating through said delay means, and
• at least one transistor having a drain connected to a power supply, a gate connected to a control voltage, and a source providing said input voltage to said plurality of delay means such that said input voltage follows said control voltage and is isolated from noise on said power supply connection to said transistor.

In a voltage controlled oscillator, a plurality of voltage controlled delay circuits forming a ring oscillator, wherein at least one of said plurality of voltage controlled delay circuits comprises:

• delay means responsive to an input voltage for varying the delay of a pair of signals propagating through said delay means, and
• a transistor having a drain connected to a power supply, a gate connected to a control voltage, and a source providing said input voltage to said delay means such that said input voltage follows said control voltage and is isolated from noise on said power supply connection to said transistor.

A voltage controlled oscillator with power supply noise isolation comprising a plurality of pairs individually including a transistor and a voltage controlled delay cell, wherein individual ones of said transistors have a gate connected to a control voltage, a drain connected to a power supply, and a source connected to a voltage controlled delay cell paired to said individual one transistor for providing an input voltage to said voltage controlled delay cell such that said input voltage follows said control voltage and is isolated from noise on said power supply connection to said individual one transistor.

A computer system comprising:

• a host processor;
• and
• a peripheral controller including a voltage controlled oscillator having at least one voltage controlled delay circuit with power supply noise isolation, wherein individual ones of said at least one voltage controlled delay circuit comprises a delay means responsive to an input voltage for varying the delay of a signal propagating through said delay means, and a transistor having a drain connected to a power supply, a gate connected to a control voltage, and a source providing said input voltage to said delay means such that said input voltage follows said control voltage and is isolated from noise on said power supply connection to said transistor.