Capacitor and resistor controlled oscillator timing lock loop fo

Details Capacitor and resistor controlled oscillator timing lock loop fo Capacitor and resistor controlled oscillator timing lock loop fo

1994-10-11

1996-08-06

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 34, 331179, H03L 7099

Patent

active

055437540

ABSTRACT:
A system including a reference oscillator, a controlled oscillator, a digital phase detector, and a digital loop filter uses a method for matching a first oscillation frequency of the controlled oscillator with a second oscillation frequency of the reference oscillator by variably selecting different capacitances and/or resistances of the controlled oscillator using switches. The first and second oscillation frequencies are provided to the digital phase detector, where they are compared to determine an output signal which is indicative of the difference between the first and second frequencies. The output signal is transmitted to a digital loop filter, which converts the output signal into control words. The control words are sent to the controlled oscillator so that the first oscillation frequency can be varied as needed. The controlled oscillator may be a capacitor controlled oscillator (CCO), a resistor controlled oscillator (RCO), or a resistor-capacitor controlled oscillator (RCCO).

REFERENCES:
patent: 3538450 (1970-11-01), Andrea et al.
patent: 4941156 (1990-07-01), Stern et al.
patent: 5036294 (1991-07-01), McCaslin
patent: 5053723 (1991-10-01), Schemmel
Yannis P. Tsividis, "Integrated Continuous-Time Filter Design-An Overview", IEEE Journal of Solid-State Circuits, vol. 29, No. 3, Mar. 1994, pp. 166-176.

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