公开(公告)号：ITVA980026A1

公开(公告)日：2000-06-16

申请号：ITVA980026

申请日：1998-12-16

Applicant: ST MICROELECTRONICS SRL

Inventor： BRAMBILLA DAVIDE ,  CAPODIVACCA GIOVANNI

IPC: H03F3/30

Abstract: A circuit for ensuring a complete saturation of both operational amplifiers of a single-input bridge amplifier is provided. A voltage divider is connected between the inverting inputs of the two amplifiers and a saturation current signal is injected on the intermediate node of the voltage divider. Such a saturation current signal is obtained through dedicated sensing devices of the state of saturation reached by the transistors of the output stages of both amplifiers of the single-input bridge amplifier.

公开(公告)号：IT1305651B1

公开(公告)日：2001-05-15

申请号：ITVA980027

申请日：1998-12-16

Applicant: ST MICROELECTRONICS SRL

Inventor： BRAMBILLA DAVIDE ,  CAPODIVACCA GIOVANNI

IPC: H03F1/30

Abstract: The anti-pop circuit includes a unity gain buffer with an input coupled to the source of the reference voltage and an output coupled to the input of the amplifier to accelerate the charging of the input coupling capacitor of the amplifier at every turn-on. The capacitor-charging buffer is automatically disabled before the turning-on of the amplifier. The charging buffer may be enabled at start up by generating an impulse of a pre-established duration at the turn-on instant by a monostable circuit or by disabling it upon verifying the decaying to zero of the charging of current of the input coupling capacitor. The circuit eliminates the popping noise at the turn-on without an excessive delay of the turning-on of the amplifier.

公开(公告)号：IT1305650B1

公开(公告)日：2001-05-15

申请号：ITVA980026

申请日：1998-12-16

Applicant: ST MICROELECTRONICS SRL

Inventor： BRAMBILLA DAVIDE ,  CAPODIVACCA GIOVANNI

IPC: H03F3/30

Abstract: A circuit for ensuring a complete saturation of both operational amplifiers of a single-input bridge amplifier is provided. A voltage divider is connected between the inverting inputs of the two amplifiers and a saturation current signal is injected on the intermediate node of the voltage divider. Such a saturation current signal is obtained through dedicated sensing devices of the state of saturation reached by the transistors of the output stages of both amplifiers of the single-input bridge amplifier.

公开(公告)号：ITVA980027A1

公开(公告)日：2000-06-16

申请号：ITVA980027

申请日：1998-12-16

Applicant: ST MICROELECTRONICS SRL

Inventor： BRAMBILLA DAVIDE ,  CAPODIVACCA GIOVANNI

IPC: H03F1/30

Abstract: The anti-pop circuit includes a unity gain buffer with an input coupled to the source of the reference voltage and an output coupled to the input of the amplifier to accelerate the charging of the input coupling capacitor of the amplifier at every turn-on. The capacitor-charging buffer is automatically disabled before the turning-on of the amplifier. The charging buffer may be enabled at start up by generating an impulse of a pre-established duration at the turn-on instant by a monostable circuit or by disabling it upon verifying the decaying to zero of the charging of current of the input coupling capacitor. The circuit eliminates the popping noise at the turn-on without an excessive delay of the turning-on of the amplifier.

公开(公告)号：DE69432637D1

公开(公告)日：2003-06-12

申请号：DE69432637

申请日：1994-12-30

Applicant: ST MICROELECTRONICS SRL

Inventor： BRAMBILLA DAVIDE ,  CAPODIVACCA GIOVANNI ,  STEFANI FABRIZIO

IPC: G01R31/00 ,  G01R31/316

公开(公告)号：DE69902889D1

公开(公告)日：2002-10-17

申请号：DE69902889

申请日：1999-06-15

Applicant: ST MICROELECTRONICS SRL

Inventor： BRAMBILLA DAVIDE ,  CAPODIVACCA GIOVANNI ,  RANIERI DANILO

IPC: H03F1/52 ,  H03F3/30 ,  H03F3/50 ,  G05F1/569