Patent application 13979938 (US), filed 2013-07-16
Publication number: US20140037112A1
Title: DIGITAL CONDENSER MICROPHONE HAVING PREAMPLIFIER WITH VARIABLE INPUT IMPEDANCE AND METHOD OF CONTROLLING VARIABLE INPUT IMPEDANCE OF PREAMPLIFIER
CPC codes: H03F   1/56
H03F   3/181
H03F   3/45475
H04R  19/04
Office action: rejection, dated 2015-10-15
Rejection reasons: anticipation_102
indefiniteness_112
Prior art cited: ref_id: KR 1020090058393
ref_type: patent
severity: novelty_destroying
Final disposition: granted (2015-10-15)