System for controlling frequency of oscillator

Details System for controlling frequency of oscillator System for controlling frequency of oscillator

2007-06-12

2007-06-12

Pascal, Robert (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S010000, C331S00100A, C331S10800D

Reexamination Certificate

active

11154548

ABSTRACT:
System for controlling the frequency of an oscillator. A first circuit is coupled to the oscillator and arranged for receiving an externally provided clock signal at a first input node. A second circuit coupled to the oscillator is arranged for receiving an externally provided frequency reference input at a second input node. The first circuit uses the clock signal received at the first input node to control the frequency of the oscillator. In absence of a clock signal received at the first node, the second circuit uses the frequency reference input received at the second input node to control the frequency of the oscillator. The frequency reference input is selectively at one of (a) a first or second fixed voltage level designating a first or second oscillator frequency, and (b) a variable signal level designating a frequency between the first and second oscillator frequencies.

REFERENCES:
patent: 5877656 (1999-03-01), Mann et al.
patent: 6803827 (2004-10-01), Kenney et al.
patent: 6812797 (2004-11-01), De Veirman et al.
patent: 6888413 (2005-05-01), Adams et al.
patent: 7012471 (2006-03-01), Lyden et al.
LTC3701; LT/TP 0403 1K; “2-Phase, Low Input Voltage, Dual Step-Down DC/DC Controller”; Linear Technology Corporation; c. 2002; pp. 1-20; USA.
LTC3412; LT/TP 0203 2K; “2.5A, 4MHz, Monolithic Synchronous Step-Down Regulator”; Linear Technology Corporation; c. 2002; pp. 1-20; USA.
LTC1735; LT/TP 0104 REV C 1K; “High Efficiency Synchronous Step-Down Switching Regulator”; Linear Technology Corporation; c. 1998; pp. 1-32; USA.

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