Patent ID: 8461883
Filing Date: 2013-06-11
Classification: G06F,H03K

Abstract:
1. A frequency generator for generating a frequency within a frequency range, the frequency generator comprising: a variable current source for selectively outputting a current among a plurality of currents according to a control signal; a voltage drop generation unit coupled to the variable current source, for generating a voltage drop according to the current; a voltage source for generating a maximum reference voltage and a minimum reference voltage in order to output a voltage range; a detection unit coupled to the voltage drop generation unit and the variable current source, for detecting whether the voltage drop generated by the voltage drop generation unit is within the voltage range or not and outputting the control signal to the variable current source according to a relationship between the voltage drop and the voltage range; a conversion unit coupled to the voltage drop generation unit, for outputting a digital code according to the relationship between the voltage drop and the voltage range; and an oscillating circuit coupled to the conversion unit, for generating the frequency according to the digital code.