Fleshner & Kim, LLP
Low frequency detection circuit
 An improved low frequency detection circuit is disclosed. The low frequency detection circuit employs as an internal clock signal of the system the negative delay signal CK1 generated in accordance with the negative delay signal generator when the externally applied clock signal is in high frequency, and the externally applied clock signal can be employed as an internal clock signal of the system when it is in low frequency, thereby simplifying and miniaturizing a required circuit. The circuit includes a negative delay signal generator for receiving an input signal and outputting a negative delay signal and a plurality of low frequency detection signals, a low frequency detector for receiving the plurality of low frequency detection signals and outputting a flag signal, and a signal selector for outputting one selected from the input signal and the negative delay signal in accordance with the flag signal. 
Hyundai Electronics Industries Co., Ltd.
H
H03K
inventional
Ju Han
Kim