Patent ID: 6940294
Filing Date: 2005-09-06
Classification: H03K

Abstract:
1. A circuit to use a MOSFET capacitor as a reference capacitor in an integrated circuit comprising: an RC-oscillator circuit having an input and an output wherein the input is a current source and a signal from a phase detector regulating the capacitance of said RC oscillator and the output is a periodical signal; a frequency reference circuit having an input and an output wherein the input is a current source and the output is a periodical signal and wherein said frequency reference circuit is comprising: a phase detector circuit having an input and an output wherein the input are the periodical output signals from said RC oscillator and from said frequency reference and the output is a signal to regulate the capacitance of the RC oscillator and the capacitance of a capacitor to become a reference capacitor; and said capacitor to become a reference capacitor.