Patent ID: 6192220
Filing Date: 2001-02-20
Classification: H03J,H03L,H04B

Abstract:
A method of providing low energy consumption ultrafast lock time in a communication system normally operating at slower lock times and requiring occasional relatively ultrafast lock times when switching from a first mode having said slower lock times to a mode where ultrafast lock times are required, which comprises the steps of:(a) providing said communication system having a PLL operating at a receive frequency and a disabled DDS; and(b) responsive to a requirement for said ultrafast lock time(i) tuning said DDS to a transmission frequency for transmission while simultaneously tuning said PLL to said transmission frequency for transmission;(ii) then commencing transmission with said DDS at said transmission frequency; and(iii) terminating operation of said DDS and substituting said PLL for said DDS when said PLL has been tuned to said transmission frequency.