Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Reexamination Certificate
2011-06-07
2011-06-07
Cho, James H. (Department: 2819)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
C331S17700V, C331S179000, C331S008000, C331S00100A
Reexamination Certificate
active
07956695
ABSTRACT:
A voltage-controlled oscillator operates at high frequency without high gain by dividing the frequency range into a plurality of subranges, which preferably are substantially equal in size. Within any subrange, the full extent of variation in the control signal changes the frequency only by the extent of the subrange. The gain is thus substantially equal to the gain one would expect for the full frequency range, divided by the number of subranges. The subrange may be selected manually, or by an initial calibration process. In one embodiment, the oscillator includes a voltage-to-current converter and a current-controlled oscillator, with a current mirror arrangement. In that embodiment, selection of the subrange may be controlled by turning on the correct number of current legs.
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Ding Weiqi
Liu Mengchi
Altera Corporation
Cho James H.
Ingerman Jeffrey H.
Lo Christopher
Ropes & Gray LLP
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