Receiver and voltage controlled oscillator
AssigneeKabushiki Kaisha Toshiba
InventorsTuan Thanh TA, Akihide SAI, Masanori FURUTA
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Abstract
According to an embodiment, a receiver includes a voltage controlled oscillator, a frequency-to--digital converter and an input sensitivity controller. In the voltage controlled oscillator, input sensitivity relative to a baseband signal is controlled based on an input sensitivity control signal. The voltage controlled oscillator oscillates at a frequency controlled by a voltage of the baseband signal to generate an oscillation signal. . The frequency--to-digital converter performs frequency-to-digital conversion of the oscillation signal to generate a digital signal. The input sensitivity controller generates the input sensitivity control signal based on the digital signal.
Claims9
A receiver comprising:
- a voltage controlled oscillator in which input sensitivity relative to a baseband signal is controlled based on an input sensitivity control signal, and that oscillates at a frequency controlled by a voltage of the baseband signal to generate an oscillation signal;
- a frequency-to-digital converter that performs frequency-to-digital conversion of the oscillation signal to generate a digital signal;
- and
- an input sensitivity controller that generates the input sensitivity control signal based on the digital signal.
A voltage controlled oscillator comprising:
- a plurality of varactor diodes;
- and
- a plurality of switches, that respectively select a baseband signal or a DC component of the baseband signal, and supply the selected signals to one ends of the plurality of varactor diodes to switch voltages to be applied to the plurality of varactor diodes,
- wherein if a voltage of the baseband signal equals a predetermined voltage value, the voltage controlled oscillator oscillates at a fixed frequency.
Dependencies are inferred from the claim text.