公开(公告)号：EP1714385A1

公开(公告)日：2006-10-25

申请号：EP05700636.3

申请日：2005-02-09

申请人： Audioasics A/S

发明人： FÜRST, Claus, Erdmann ,  MUCHA, Igor

IPC分类号： H03F3/187 ,  H03F3/181 ,  H03F1/34 ,  H04R19/01 ,  H04R19/04 ,  H03F1/32 ,  H03F3/45

CPC分类号： H03F1/3211 ,  H03F1/34 ,  H03F3/181 ,  H03F3/187 ,  H03F3/45968 ,  H03F2200/03 ,  H03F2200/331 ,  H03F2203/45138 ,  H03F2203/45418 ,  H03F2203/45424 ,  H03F2203/45544 ,  H03F2203/45594 ,  H03F2203/45596 ,  H04R1/04 ,  H04R3/00 ,  H04R19/016 ,  H04R19/04

摘要： An integrated circuit, configured to process microphone signals, where the integrated circuit comprises: a preamplifier (306) with an amplifier section (301) which has a first input (ϕ) and a second input (ϕ*) and an output (φ), and with a feedback filter network (Z1; Z1, Z1 *, Z2) coupled between the output (φ; φ, φ*) and the second input (ϕ'); where the first input (ϕ) to the amplifier section (301) has an input impedance which by means of the input impedance of the amplifier section is substantially isolated from the feedback network with respect to input impedance; and where the preamplifier has a frequency-gain transfer function which suppress low frequencies; and an analogue-to-digital converter coupled to receive an anti-aliasing filtered input signal and providing a digital output signal (Do).

摘要翻译： 1。一种集成电路，其被配置为处理麦克风信号，其中集成电路包括：具有放大器部分（301）的前置放大器（306），所述放大器部分具有第一输入（φ）和第二输入（φ*）以及输出（φ） （φ;φ，φ*）和第二输入（φ'）之间的反馈滤波器网络（Z1; Z1，Z1 *，Z2） 其中到放大器部分（301）的第一输入（φ）具有输入阻抗，借助放大器部分的输入阻抗相对于输入阻抗基本上与反馈网络隔离; 并且其中前置放大器具有抑制低频率的频率增益传递函数; 以及模数转换器，其被耦合以接收抗混叠滤波输入信号并提供数字输出信号（Do）。

公开(公告)号：EP1683267A1

公开(公告)日：2006-07-26

申请号：EP04762926.6

申请日：2004-10-14

申请人： Audioasics A/S

发明人： DERUGINSKY, Michael ,  FÜRST, Claus, Erdmann

IPC分类号： H03F3/187 ,  H03F3/181 ,  H03F1/34 ,  H04R19/01 ,  H04R19/04

CPC分类号： H03F3/187 ,  H03F1/3211 ,  H03F1/34 ,  H03F3/181 ,  H03F2200/261 ,  H04R19/016

摘要： A microphone preamplifier, comprising a differential input (102) stage with a first and a second input terminal and an output stage with an output terminal; where the microphone preamplifier is integrated on a semiconductor substrate. A feedback circuit, with a low-pass frequency transfer function (103), is coupled between the output terminal and the first input terminal and integrated on the semiconductor substrate. The second input terminal provides an input for a microphone signal (105). Thereby a very compact (with respect to consumed area of the semiconductor substrate), low noise preamplifier is provided.