Voltage-controlled oscillator using current feedback network

Details Voltage-controlled oscillator using current feedback network Voltage-controlled oscillator using current feedback network

2007-01-30

2007-01-30

Chang, Joseph (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S17700V

Reexamination Certificate

active

10957749

ABSTRACT:
Provided is a voltage-controlled oscillator (VCO) using a current feedback network for use in a wireless communication terminal. The voltage-controlled oscillator has high input impedance and low output impedance, so that a degree of isolation from the external load is excellent, thereby preventing degradation of the Q-factor by the load in overall oscillation circuit. In the voltage-controlled oscillator of the present invention, an LC resonator is provided to generate positive feedback, and negative resistance may be obtained at a wider frequency range by tuning a varactor of the LC resonator. And a boosting inductor is inserted into the positive feedback loop to have a greater negative resistance, therefore it is possible to prevent a problem in which the oscillation does not occur due to the parasitic resistance components generated during circuit fabrication.

REFERENCES:
patent: 6545554 (2003-04-01), Rozenblit et al.
patent: 6624709 (2003-09-01), Hiroshima et al.
patent: 6717482 (2004-04-01), Sato et al.
patent: 2000-18545 (2000-10-01), None
Yeom Kyung-Whan; Design and fabrication of the surface mountable VCO operating at 3V for PCS handset; Thesis 96-21-3-24; Thesis No. 96037-0202; Chungnam Univ.; Feb. 2, 1996.
Ulrich L. Rohde; Nonlinear Effects In Oscillators and Synthesizers (Invited); 2001 IEEE MTT-S Digest; 0-7803-6538-0/01/$10.00 © 2001 IEEE.
Lee et al., “An 1.8 GHz voltage-controlled oscillator using current-current negative feedback network”, 6thEuropean Conference on Wireless Technology, Oct. 2004, pp. 113-116.

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