Enhanced architectures of voltage-controlled oscillators...

Details Enhanced architectures of voltage-controlled oscillators... Enhanced architectures of voltage-controlled oscillators...

2006-06-13

2006-06-13

Chang, Joseph (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S185000

Reexamination Certificate

active

07061339

ABSTRACT:
Methods to achieve low power consumption, high output amplitude and an improved high frequency stability, and high speed for voltage-controlled oscillators are disclosed These methods includes to provide a current mirror, a power supply voltage Vdd, two single-ended outputs, a lower layer of gain providing structure comprising cross-coupled transistors, an upper layer of gain providing structure, a control voltage, a pair of capacitors to block a DC-connection to the gates of said cross-coupled transistors, a pair of resistors, and an LC-tank. Important steps of these methods include to set the time instances when said transistors of lower layer of gain providing structure open and close, to shut-down the transistors of lower layer of gain providing structure as soon as the energy required to keep the oscillations in said LC-tank is secured, to add additional gain in the amplification loop; and to pump-out charges of the channels of said transistors of said lower layer gain providing structure.

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“A Fully Integrated CMOS DCS-1800 Frequency Synthesizer” by Jan Craminckx et al; IEEE Jrnl. of Solid-State Circuits, vol. 33, No. 12, Dec. 1998, pp. 2054-2065.
“Wide-Tuning-Range Dual-VCOs for Cable Modem Receivers,” by Dari Stadius et al; 2002 IEEE MTT-S Digest, XP-001099558, IT-TU-53, pp. 581-584.

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