Radio with fast lock phase-locked loop

Details Radio with fast lock phase-locked loop Radio with fast lock phase-locked loop

H - Electricity

03

L

H03L 7/16 (2006.01) H03L 7/107 (2006.01) H03L 7/183 (2006.01) H04B 1/40 (2006.01) H04J 3/02 (2006.01)

Patent

CA 2102496

2102496 9222147 PCTABS00018 A communication device (508) for use in a Time Division Multiplex (TDM) communication system (500) includes a transmitter, a receiver, and a frequency scanner for quickly scanning the radio frequency communication channels to determine an available channel. The communication device (508) also includes a phase locked loop (100) for providing a reference signal for the communication device (508) and locking to the available channel. This phase locked loop (100) includes a Voltage Control Oscillator (VCO) (104) having a control signal input (103). The phase locked loop (100) also includes a first filter (110) and a second filter (108). The first filter (110) has a wide frequency response. The second filter (108) includes a storage element (222) and has a narrow frequency response. The phase locked loop (100) also includes a switching circuit (106) which determines which one of the two filters (110, 108) gets coupled to the voltage control oscillator (104).

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