Oscillators – Ring oscillators
Patent
1995-04-19
1996-10-01
Mis, David
Oscillators
Ring oscillators
331 50, 331117R, 331172, 331175, H03B 512
Patent
active
055613993
ABSTRACT:
An apparatus and method are provided for increasing the Q-value of an oscillator so that a net gain in the stability of the oscillators is obtained. In the apparatus and method, a plurality of units, which each include a passive frequency-selective circuit and an active amplifier, are cascaded and the required isolation between the passive frequency-selective circuits is maintained by the active amplifier acting as a buffer. As a result, interaction and loading is prevented between the passive frequency-selective circuits so that the net gain in the stability of the oscillator is achieved because the Q-value of the oscillator is increased.
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N. Nguyen et al., "A 1.8-GHz Monolithic LC Voltage-Controlled Oscillator," IEEE Journal of Solid-State Circuits, vol. 27, No. 3, Mar. 1992, pp. 444-450.
Mis David
Telefonaktiebolaget LM Ericsson
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