System and method for frequency management in a communications positioning device
First Claim
1. A system for generating a frequency reference in a hybrid communications device, comprising:
- a clock source in a communications portion of the hybrid communications device, the clock source generating a clock signal at a first frequency;
a frequency correction module, communicating with the clock source, the frequency correction module generating a clock signal at a corrected first frequency;
a frequency converter, the frequency converter communicating with the frequency correction module to receive the clock signal at the corrected first frequency and outputting a clock signal at a second frequency to operate a positioning receiver portion of the hybrid communications device to receive a wireless positioning signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A frequency management scheme for a hybrid communications/positioning device, such as a cellular/GPS or other combined device, generates a local clock signal for the communications portion of the device, using a crystal oscillator or other part. The oscillator output may be corrected by way of an automatic frequency control (AFC) circuit or software, to drive the frequency of that clock signal to a high accuracy. The base oscillator may be delivered to a phase locked loop to drive a high-frequency clock for the cellular or other communications portion of the hybrid device, which clock signal may also be frequency-converted to drive a GPS or other positioning receiver. The extraction of a base GPS clock from the radio frequency reference eliminates the need for a second oscillator or synthesizer for that portion of the hybrid device. In embodiments, AFC tuning on the cellular clock may be omitted and the high frequency clock signal divided down for delivery to the GPS or other positioning receiver may be adjusted via a frequency prescaler, or other module.
31 Citations
40 Claims
-
1. A system for generating a frequency reference in a hybrid communications device, comprising:
-
a clock source in a communications portion of the hybrid communications device, the clock source generating a clock signal at a first frequency;
a frequency correction module, communicating with the clock source, the frequency correction module generating a clock signal at a corrected first frequency;
a frequency converter, the frequency converter communicating with the frequency correction module to receive the clock signal at the corrected first frequency and outputting a clock signal at a second frequency to operate a positioning receiver portion of the hybrid communications device to receive a wireless positioning signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method for generating a frequency reference in a hybrid communications device, comprising:
-
generating a clock signal at a first frequency in a communications portion of the hybrid communications device;
generating a clock signal at a corrected first frequency based on the clock signal at the first frequency;
generating a clock signal at a second frequency based on the clock signal at the corrected first frequency to operate a positioning receiver portion of the hybrid communications device to receive a wireless positioning signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
-
-
27. A system for generating a frequency reference in a hybrid communications device, comprising:
-
a clock source in a communications portion of the hybrid communications device, the clock source generating a clock signal at a first frequency;
a frequency converter, the frequency converter communicating with the clock source to receive the clock signal at the first frequency and outputting a clock signal at a second frequency, the second frequency being used to operate a positioning receiver portion of the hybrid communications device to receive a wireless positioning signal. - View Dependent Claims (28, 29, 30, 31, 32, 33)
-
-
34. A method for generating a frequency reference in a hybrid communications device, comprising:
-
generating a clock signal at a first frequency in a communications portion of the hybrid communications device;
generating a clock signal at a second frequency based on the clock signal at the first frequency to operate a positioning receiver portion of the hybrid communications device to receive a wireless positioning signal. - View Dependent Claims (35, 36, 37, 38, 39, 40)
-
Specification
-
- Resources
-
Current AssigneeMotorola, Inc. (Motorola Solutions, Inc.)
-
Original AssigneeMotorola, Inc. (Motorola Solutions, Inc.)
-
InventorsVoor, Thomas E., Tawadrous, Sameh W., Deck, Ronald H.
-
Application NumberUS10/438,441Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current342/357.1CPC Class CodesG01S 19/235 Calibration of receiver com...H03J 2200/11 Cellular receiver, e.g. GSM...H03J 7/065 the counter or frequency di...H03L 7/183 a time difference being use...H03L 7/23 with pulse counters or freq...H04B 1/3805 with built-in auxiliary rec...H04B 1/403 using the same oscillator f...
