Infrared ray sensor driving circuit
 An improved infrared ray sensor driving circuit capable of advantageously controlling an amplifying level and a cut-off frequency of a filter by separating the functions of an amplifier and a filter, respectively. The circuit includes an impedance matching circuit for converting a high impedance of the signals detected to a low impedance signal, a first amplifying circuit for amplifying signals outputted from the impedance matching circuit by a first predetermined gain, a filtering circuit for filtering the signals outputted from the first amplifying circuit to pass frequencies of a predetermined bandwidth, and a second amplifying circuit for amplifying the signals outputted from the filtering circuit by a second predetermined gain. 
Goldstar Co., Ltd.
H Y G
H03F Y10S G01J
inventional additional inventional
Sung M. Jun R.
Cho Choi