Voltage-controlled oscillator with differential output

Details Voltage-controlled oscillator with differential output Voltage-controlled oscillator with differential output

2007-10-23

2007-10-23

Pascal, Robert (Department: 2817)

Oscillators

L-c type oscillators

C331S045000, C331S074000, C331S1170FE, C333S025000

Reexamination Certificate

active

10922038

ABSTRACT:
A voltage-controlled oscillator for generating differential output is disclosed. The voltage-controlled oscillator comprises a Colpitts oscillator having a first inductor and a capacitive divider having at least two capacitors connected in series. A varactor is connected in series with the capacitive divider and to a reference voltage, and a second inductor is mutually coupled to the first inductor for providing the differential output. A second inductor is substantially centrally tapped and connected to the reference voltage for providing a substantially balanced output. The operating frequency of the voltage-controlled oscillator is dependent on an applicable potential difference across the varactor.

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“A Fully-Integrated CMOS RFIC for Bluetooth Applications” by Aruna Ajjikuttira, et al., 2001 IEEE International Solid-state Circuits Conference, pp. 198-199, p. 446.

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