Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural a.f.s. for a single oscillator
Patent
1993-10-20
1995-08-29
Pascal, Robert J.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural a.f.s. for a single oscillator
331 2, H03L 706
Patent
active
054464161
ABSTRACT:
A time acquisition system is disclosed with dual independent frequency and phase lock loops, each containing a dedicated voltage controlled oscillator (VCO). The frequency lock loop (FLL) outputs a frequency bias signal, used for coarse frequency lock-up, only when the difference frequency between the input signal and the FLL VCO is outside a predetermined frequency band -.DELTA..omega..sub.L to .DELTA..omega..sub.L. Significantly, the frequency bias signal is equal to zero when the difference frequency between the input signal and the FLL VCO is inside the frequency band -.DELTA..omega..sub.L to .DELTA..omega..sub.L. The phase lock loop (PLL) provides a phase bias signal, used for fine tuning lock-up, when the difference frequency between the input signal and the PLL VCO is inside the predetermined frequency band -.DELTA..omega..sub.L to .DELTA..omega..sub.L. Therefore, there is no interaction between loops during the final phase tuning lock-up.
REFERENCES:
patent: 4131861 (1978-12-01), Malaviya
Cordell et al., A 50 MHz Phase-and Frequeny-Locked Loop, Dec. 1979, pp. 1003-1005.
Lee Ret-Bean
Lin Hsan-Fong
Lin Ji-zoo
Wang Chorng-Kuang
Industrial Technology Research Institute
Lin Bo-In
Pascal Robert J.
Vu David
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