Oscillators – Ring oscillators
Patent
1998-02-27
1999-08-10
Grimm, Siegfried H.
Oscillators
Ring oscillators
331177R, 331186, H03B 502
Patent
active
059364785
ABSTRACT:
A voltage controlled oscillator (VCO) is provided which can minimize the frequency shift and phase disturbance caused by noise in the input voltage to the VCO. The VCO includes a voltage-to-current converting unit, receiving the input voltage, for generating a bias voltage. A ring-oscillating unit including an odd number of cascaded ring oscillator stages (ROSC) is coupled to the voltage-to-current converting unit for generating an oscillating signal. A bias unit is coupled to the ring-oscillating unit for generating a stable DC bias voltage for the ring-oscillating unit. A current adjustment unit is coupled to the voltage-to-current converting unit and the ring-oscillating unit, which can generate a working current in response to the bias voltage for the ring-oscillating unit. By feeding the bias voltage and the DC bias voltage to the current adjustment unit, a current feedback loop is formed which serves as a current-sampling shunt-mixing circuit producing a stable current output that allows the VCO to produce an oscillating signal with a stable frequency.
REFERENCES:
patent: 5638014 (1997-06-01), Kurita
Lee Chien-Hsiung
Lin Yuh-Min
Davicom Semiconductor, Inc.
Grimm Siegfried H.
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