Oscillators – Solid state active element oscillator – Transistors
Reexamination Certificate
2006-02-28
2008-11-25
Chang, Joseph (Department: 2817)
Oscillators
Solid state active element oscillator
Transistors
C331S17700V
Reexamination Certificate
active
07456697
ABSTRACT:
A variable degeneration impedance supply circuit, including: two alternatively connected transistors; a capacitor circuit having a predetermined capacitance and serially connecting output terminals of the two transistors; and a switch for controlling on/off state between the capacitor circuit and the output terminal, according to a predetermined first control signal. The circuit further includes: at least one sub capacitor circuit arrayed in parallel to the capacitor circuit for serially connecting the output terminals of the two transistors; and at least one sub switch for controlling on/off state between the sub capacitor circuit and the output terminal, according to a predetermined control signal. Therefore, the magnitude of a degeneration impedance can be varied by controlling degeneration capacitance. Moreover, the variable degeneration impedance supply circuit can be advantageously applied to a voltage controlled oscillation circuit and a frequency divider circuit.
REFERENCES:
patent: 2003/0027531 (2003-02-01), Malhi et al.
patent: 2004/0080374 (2004-04-01), Muramatsu
patent: 2006/0091968 (2006-05-01), Darabi et al.
Lee Jae-sup
Lee Kwy-ro
Song Sung-sik
Chang Joseph
Samsung Electronics Co,. Ltd.
Sughrue & Mion, PLLC
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