Oscillators – L-c type oscillators
Reexamination Certificate
2007-11-27
2007-11-27
Kinkead, Arnold (Department: 2817)
Oscillators
L-c type oscillators
C331S1170FE, C331S1170FE, C331S17700V, C331S179000
Reexamination Certificate
active
11298010
ABSTRACT:
A VCO circuit (20) has a coil (21) and, in parallel therewith, a constant capacitance (24) and adjustable capacitance elements (22, 23). A first capacitance element (22) is formed by one or more varactors whose capacitance can be adjusted by an analogue adjusting voltage (Vtune), while a second capacitance element (23) is formed by an arrangement comprising a plurality of capacitors which can be actuated by a digital bit word VCWD[N:1]. Digital calibration for the VCO (20) is performed by determining whether the present adjusting voltage is within a particular voltage range and, if this is not the case, the digital bit word being incremented or decremented by a bit value.
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Li Puma Giuseppe
Pham-Stäbner Duyen
Stabner Georg
Dicke Billig & Czaja, PLLC
Kinkead Arnold
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