FREQUENCY GENERATION IN A WIRELESS COMMUNICATION UNIT
First Claim
1. A wireless communication device comprises:
- a frequency generation circuit employing a crystal oscillator operably coupled to a fractional-based synthesiser and a voltage controlled oscillator, wherein the fractional-based synthesiser utilises a ratio between an integer value and a fractional value to set a radio frequency signal of the voltage controlled oscillator;
an automatic frequency control scaling sub-system is operably coupled to the fractional-based synthesiser and configured to receive and use a single AFC word to frequency scale the fractional value in a multiplicative manner to generate substantially all desired radio frequencies from the voltage controlled oscillator.
29 Assignments
0 Petitions
Accused Products
Abstract
A wireless communication device comprises a frequency generation circuit employing a crystal oscillator operably coupled to a fractional-based synthesiser and a voltage-controlled oscillator. The fractional-based synthesiser utilises a ratio between an integer value and a fractional value to set a radio frequency signal of the voltage-controlled oscillator. An automatic frequency control scaling sub-system is operably coupled to a fractional-based synthesiser and configured to receive and use an AFC word to frequency scale the fractional value in a multiplicative manner to set a radio frequency supported by the fractional-based synthesiser. Preferably, an automatic frequency generation sub-system utilises Absolute Radio Frequency Channel Number and the cyclical nature of the fractional value.
In this manner, a saving on hardware and software overheads associated with frequency channel selection for fractional-N type synthesizers can be made.
-
Citations
21 Claims
-
1. A wireless communication device comprises:
-
a frequency generation circuit employing a crystal oscillator operably coupled to a fractional-based synthesiser and a voltage controlled oscillator, wherein the fractional-based synthesiser utilises a ratio between an integer value and a fractional value to set a radio frequency signal of the voltage controlled oscillator; an automatic frequency control scaling sub-system is operably coupled to the fractional-based synthesiser and configured to receive and use a single AFC word to frequency scale the fractional value in a multiplicative manner to generate substantially all desired radio frequencies from the voltage controlled oscillator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. An integrated circuit comprising:
-
a frequency generation circuit and a fractional-based synthesiser for operably coupling to a crystal oscillator and a voltage controlled oscillator, wherein the fractional-based synthesiser utilises a ratio between an integer value and a fractional value to set a radio frequency signal of the voltage controlled oscillator; an automatic frequency control scaling sub-system, operably coupled to the fractional-based synthesiser and configured to receive and use a single AFC word to frequency scale the fractional value in a multiplicative manner to generate substantially all desired radio frequencies from the voltage controlled oscillator.
-
-
10. A method of generating a radio frequency signal in a wireless communication device comprising a frequency generation circuit employing a crystal oscillator operably coupled to a fractional-based synthesiser and a voltage controlled oscillator, wherein the fractional-based synthesiser utilises a ratio between an integer value and a fractional value to set a radio frequency signal of the voltage controlled oscillator, the method comprising:
-
receiving a single AFC word; and scaling, using the AFC word, the fractional value in a multiplicative manner, to generate substantially all desired radio frequencies from the voltage controlled oscillator. - View Dependent Claims (11, 12)
-
-
13-14. -14. (canceled)
-
15. A wireless communication device comprises:
-
a frequency generation circuit employing a crystal oscillator operably coupled to a fractional-based synthesiser and a voltage controlled oscillator, wherein the fractional-based synthesiser utilises a ratio between an integer value and a fractional value to set a radio frequency signal of the voltage controlled oscillator; the wireless communication unit; the frequency step value of the fractional-based synthesiser is arranged to be an integer value of the crystal oscillator to enable the single fractional value to be cyclical to generate substantially all desired radio frequency signals of the voltage-controlled oscillator. - View Dependent Claims (16, 20, 21)
-
-
17-19. -19. (canceled)
Specification