Oscillators – Frequency stabilization – Temperature or current responsive means in circuit
Reexamination Certificate
2007-06-19
2007-06-19
Mis, David (Department: 2817)
Oscillators
Frequency stabilization
Temperature or current responsive means in circuit
C331S034000, C331S057000, C331S17700V, C331S186000
Reexamination Certificate
active
11198691
ABSTRACT:
A voltage-controlled oscillator includes a bias circuit and a delay circuit. The bias circuit may generate a bias voltage signal pair having levels that are based on the voltage level of an input voltage signal and that are constrained by the values of a maximum current signal and a minimum current signal that are generated in the bias circuit. The delay circuit generates an output signal having a frequency that varies in response to the bias voltage signal pair. Because an operating frequency range of a voltage-controlled oscillator VCO is limited by a bias circuit, the VCO can operate with reduced gain and can limit the maximum operating frequency to a predetermined level. The VCO may also include a PTAT current generator in the bias circuit which can allow the VCO to compensate for variations of the VCO output frequency based on temperature.
REFERENCES:
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Notice to Submit Response in Korean Application No. 10-2004-0064058; Date of mailing; Jul. 20, 2006.
English translation of Notice to Submit Response in Korean Application No. 10-2004-0064058; Date of mailing Jul. 20, 2006.
Kim Ju-Hyung
Kim Woo-Seok
Mis David
Myers Bigel & Sibley & Sajovec
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