CMOS LC-tank oscillator

Details CMOS LC-tank oscillator CMOS LC-tank oscillator

2007-08-14

2007-08-14

Kinkead, Arnold (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S167000, C331S1170FE, C331S185000

Reexamination Certificate

active

11132908

ABSTRACT:
A CMOS LC-tank oscillator includes a pair of symmetric inductors and a differential pair of transistors. The inductors have a first one of their terminals interconnected at a supply node to which a voltage supply is applied through a supply resistor and a second terminal connected to the drain of a respective one of the transistors. The transistors have their sources interconnected at a tail node which is connected to ground through a tail resistor. A current control loop controls a core current between the supply and tail nodes so as to keep a voltage drop across the tail resistor at a level determined by a reference voltage. The current control loop keeps the core current between the supply and tail nodes at the required level so that a resistor may replace the upstream supply voltage regulator and another resistor may replace the downstream bias regulator. Consequently, sources of noise injected into the LC-tank type oscillator are eliminated.

REFERENCES:
patent: 6765448 (2004-07-01), Wu et al.
patent: 2113589 (1972-09-01), None
patent: 10246844 (2004-09-01), None

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