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US 10,659,096 B2Granted
Frequency scan with radio maintained in active state
AssigneeNXP USA, Inc.
InventorsKhurram Waheed, Carlos Alberto Neri Castellanos
Life of this patent
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Abstract
A method of performing a frequency scan at a radio includes placing the radio in an active mode and, while maintaining the radio in the active mode, for each of a plurality of target frequencies determining a coarse frequency tuning value based on the target frequency. The radio places a phase locked loop (PLL) in an open-loop configuration and while the PLL is in the open-loop configuration, programs the VCO with the coarse frequency tuning value. The radio programs the divider with a feedback adjustment based on the target frequency, places the PLL in a closed-loop configuration, and in response to the PLL reaching a settled state, performs an operation based on an output signal of the PLL.
Claims20
A method comprising:
- placing a radio of a device in an active mode, the radio comprising a phase locked loop (PLL), which in turn comprises a voltage-controlled oscillator (VCO) and a divider;
- and
- while maintaining the radio in the active mode:
- determining a first coarse frequency tuning value based on a first target frequency;
- determining a first fractional divider value based on the first target frequency;
- placing the PLL in an open-loop configuration;
- while the PLL is in the open-loop configuration, programming the VCO with the first coarse frequency tuning value, and programming the divider with the first fractional divider value;
- placing the PLL in a closed-loop configuration with the VCO programmed with the first coarse frequency tuning value and the divider programmed with the first fractional divider value;
- with the VCO programmed with the first coarse frequency tuning value and the divider programmed with the first fractional divider value, performing a first operation at the radio based on an output signal of the PLL while it is in the closed-loop configuration;
- determining a second coarse frequency tuning value based on a second target frequency;
- determining a second fractional divider value based on the second target frequency;
- placing the PLL in the open-loop configuration after performing the first operation;
- while the PLL is in the open-loop configuration, programming the VCO with the second coarse frequency tuning value, and programming the divider with the second fractional divider value;
- placing the PLL in the closed-loop configuration with the VCO programmed with the second coarse frequency tuning value and the divider programmed with the second fractional divider value;
- and
- with the VCO programmed with the second coarse frequency tuning value and the divider programmed with the second fractional divider value, performing a second operation at the radio based on an output signal of the PLL while it is in the closed-loop configuration.
13 more elements
A method, comprising:
- maintaining a radio in an active mode during a frequency scan at the radio of a plurality of target frequencies, the frequency scan comprising:
- determining a first coarse frequency tuning value based on a first target frequency;
- determining a first fractional divider value based on the first target frequency;
- placing the PLL in an open-loop configuration;
- while the PLL is in the open-loop configuration, programming the VCO with the first coarse frequency tuning value, and programming the divider with the first fractional divider value;
- placing the PLL in a closed-loop configuration with the VCO programmed with the first coarse frequency tuning value and the divider programmed with the first fractional divider value;
- determining a second coarse frequency tuning value based on a second target frequency;
- determining a second fractional divider value based on the second target frequency;
- placing the PLL in the open-loop configuration after programming the VCO with the first coarse frequency tuning value and the divider with the first fractional divider value;
- while the PLL is in the open-loop configuration, programming the VCO with the second coarse frequency tuning value, and programming the divider with the second fractional divider value;
- placing the PLL in the closed-loop configuration with the VCO programmed with the second coarse frequency tuning value and the divider programmed with the second fractional divider value.
8 more elements
A device comprising:
- a radio comprising a phase locked loop (PLL), which in turn comprises a voltage-controlled oscillator (VCO) and a divider, wherein the radio, while in an active mode is configured to:
- determine a first coarse frequency tuning value based on a first target frequency;
- determine a first fractional divider value based on the first target frequency;
- place the PLL in an open-loop configuration;
- while the PLL is in the open-loop configuration, program the VCO with the first coarse frequency tuning value, and program the divider with the first fractional divider value;
- place the PLL in a closed-loop configuration with the VCO programmed with the first coarse frequency tuning value and the divider programmed with the first fractional divider value;
- and
- with the VCO programmed with the first coarse frequency tuning value and the divider programmed with the first fractional divider value, perform a first operation at the radio based on an output signal of the PLL while it is in the closed-loop configuration;
- determine a second coarse frequency tuning value based on a second target frequency;
- determine a second fractional divider value based on the second target frequency;
- place the PLL in the open-loop configuration after performing the first operation;
- while the PLL is in the open-loop configuration, program the VCO with the second coarse frequency tuning value, and program the divider with the second fractional divider value;
- place the PLL in the closed-loop configuration with the VCO programmed with the second coarse frequency tuning value and the divider programmed with the second fractional divider value;
- and
- with the VCO programmed with the second coarse frequency tuning value and the divider programmed with the second fractional divider value, perform a second operation at the radio based on an output signal of the PLL while it is in the closed-loop configuration.
12 more elements
Dependencies are inferred from the claim text.