Method and apparatus for calibrating a ramp signal

Details Method and apparatus for calibrating a ramp signal Method and apparatus for calibrating a ramp signal

2005-08-19

2009-08-11

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C327S132000, C327S137000

Reexamination Certificate

active

07573250

ABSTRACT:
A circuit for calibrating an oscillating ramp signal to a variable DC reference signal in accordance with an embodiment of the present application includes a circuit for setting a predetermined time period during which a charging capacitor can charge and thus determining a ramp oscillator frequency; a variable current source for providing a charging current to the charging capacitor; a circuit for selecting the charging current fed by the variable current source to said charging capacitor; and a circuit for comparing the oscillating ramp signal to the variable DC reference signal and for supplying a signal to the selecting circuit for controlling the amount of current supplied to said charging capacitor thereby determining the charging voltage across said capacitor at the end of said predetermined time period.

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Yasushi, Katayama and Satoshi, Sugahara,.“Low-Noise DC-DC Converter IC using Spread-Spectrum PWM Control,” The Institute of Electronics Information and Communication Engineers Technical Report. Technical Report of IEICE. Japan. The Institute of Electronics Information and Communication Engineers. Oct. 18, 2002. vol. 102. No. 475. pp. 67-72.

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