Oscillators – Solid state active element oscillator – Transistors
Reexamination Certificate
2005-02-22
2005-02-22
Mis, David (Department: 2817)
Oscillators
Solid state active element oscillator
Transistors
Reexamination Certificate
active
06859112
ABSTRACT:
A voltage controlled oscillator circuit and method comprising: a harmonic oscillator having a cross-coupled NFET devices (T1, T2) and an LC tank circuit (L1, L2, C) performing oscillation; a series voltage regulator (210) regulating voltage applied to the harmonic oscillator via a PFET device (T3) and differential amplifier (R); and a tuning circuit (220) having voltage controlled capacitance ‘Zero-Vt’ NFET devices (T4, T5) controlling oscillation of the harmonic oscillator. A differential output buffer (B) provides output buffering to a subsequent stage. This provides advantages that: operation at low supply voltages is facilitated and the sensitive oscillator cell is decoupled from the main supply noise offering improved phase noise performance; the output swing of the oscillator has a well controlled common-mode value which can be selected to most efficiently drive a following stage; and using ‘Zero-Vt’ NFETs facilitates the use of a lower supply voltage.
REFERENCES:
patent: 4593256 (1986-06-01), Bickley
patent: 6087896 (2000-07-01), Bazzani
patent: 6225871 (2001-05-01), Chien
patent: 6281758 (2001-08-01), Elsayed et al.
Bluestone Randall J.
Harrington & Smith ,LLP
International Business Machines - Corporation
Mis David
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