公开(公告)号：DE68927951D1

公开(公告)日：1997-05-15

申请号：DE68927951

申请日：1989-12-11

Applicant: MOTOROLA INC

Inventor： HUYNH LUONG THIEN

IPC: H03F3/30

Abstract: An amplifier output stage for a loudspeaker includes current sourcing (20) and sinking (70) sections arranged in push-pull and a cascode stage (50) for driving the current section and biasing both the sinking and sourcing sections.

公开(公告)号：GB2302627A

公开(公告)日：1997-01-22

申请号：GB9512948

申请日：1995-06-24

Applicant: MOTOROLA INC

Inventor： HUYNH LUONG THIEN ,  LEHNING HEINZ

IPC: H03F3/20 ,  G06G7/12 ,  H03F3/30 ,  H03F3/343 ,  H03F3/42 ,  H03F3/45

Abstract: A high voltage operational amplifier receives a low voltage differential input signal at a low voltage transconductance stage (3) which provides a differential current output. An intermediate stage ( 5) has a differential current input coupled to the differential current output of the transconductance stage (3) via a voltage buffer stage (4) and produces a voltage output at a high voltage level but with low voltage swings providing a voltage representing the differential input signal. An interface stage (9) is coupled to receive the voltage output of the intermediate stage (5) and provides voltage and current outputs representing the voltage output of the intermediate stage (5). Output sourcing and sinking stages (6 and 7) receive the voltage and current outputs of the interface stage (9), respectively, and produce high currents representative of the differential input signal. The combination of the high current outputs of the output sourcing and sinking stages (6 and 7) produces a high voltage output signal at the output terminal (8).

公开(公告)号：DE69615938D1

公开(公告)日：2001-11-22

申请号：DE69615938

申请日：1996-06-20

Applicant: MOTOROLA INC

Inventor： HUYNH LUONG THIEN ,  LEHNING HEINZ

IPC: G06G7/12 ,  H03F3/20 ,  H03F3/30 ,  H03F3/343 ,  H03F3/42 ,  H03F3/45

Abstract: A high voltage operational amplifier receives a low voltage differential input signal at a low voltage transconductance stage (3) which provides a differential current output. An intermediate stage ( 5) has a differential current input coupled to the differential current output of the transconductance stage (3) via a voltage buffer stage (4) and produces a voltage output at a high voltage level but with low voltage swings providing a voltage representing the differential input signal. An interface stage (9) is coupled to receive the voltage output of the intermediate stage (5) and provides voltage and current outputs representing the voltage output of the intermediate stage (5). Output sourcing and sinking stages (6 and 7) receive the voltage and current outputs of the interface stage (9), respectively, and produce high currents representative of the differential input signal. The combination of the high current outputs of the output sourcing and sinking stages (6 and 7) produces a high voltage output signal at the output terminal (8).

公开(公告)号：GB2302626B

公开(公告)日：2000-05-03

申请号：GB9512945

申请日：1995-06-24

Applicant: MOTOROLA INC

Inventor： HUYNH LUONG THIEN ,  LEHNING HEINZ

IPC: H03F3/30 ,  H03F3/42 ,  H03F3/343

Abstract: A current sourcing output stage for a high voltage operational amplifier receives a low voltage input signal (VIN) and provides a high current output signal corresponding to the low voltage input signal at an output terminal (8). A first PNP transistor (Q1) is coupled between a voltage supply (VCC) and a plurality of cascaded PNP transistors (Q2, Q3, Q8 - Q11) coupled to the output terminal (8). The base of the first PNP transistor (Q1) is coupled to receive the input signal (VIN) and the bases of the cascaded PNP transistors are coupled to receive different bias voltages A control circuit (Q5 - Q7, R1 - R5) is coupled to the voltage supply (VCC) and has an input coupled to the output terminal (8) for deriving a plurality of bias voltages and to the cascaded PNP transistors (Q2, Q3, Q8 - Q11) to supply the bias voltages to the respective bases of the cascaded PNP transistors, so that the cascaded PNP transistors (Q2, Q3, Q8 - Q11) are biased by bias voltages dependent on the voltage swing of the output signal.

公开(公告)号：HK106995A

公开(公告)日：1995-07-07

申请号：HK106995

申请日：1995-06-29

Applicant: MOTOROLA INC

Inventor： HUYNH LUONG THIEN

IPC: H03F3/30

Abstract: An amplifier output stage for a loudspeaker includes current sourcing (20) and sinking (70) sections arranged in push-pull and a cascode stage (50) for driving the current section and biasing both the sinking and sourcing sections.

公开(公告)号：DE69615938T2

公开(公告)日：2002-04-25

申请号：DE69615938

申请日：1996-06-20

Applicant: MOTOROLA INC

Inventor： HUYNH LUONG THIEN ,  LEHNING HEINZ

IPC: G06G7/12 ,  H03F3/20 ,  H03F3/30 ,  H03F3/343 ,  H03F3/42 ,  H03F3/45

Abstract: A high voltage operational amplifier receives a low voltage differential input signal at a low voltage transconductance stage (3) which provides a differential current output. An intermediate stage ( 5) has a differential current input coupled to the differential current output of the transconductance stage (3) via a voltage buffer stage (4) and produces a voltage output at a high voltage level but with low voltage swings providing a voltage representing the differential input signal. An interface stage (9) is coupled to receive the voltage output of the intermediate stage (5) and provides voltage and current outputs representing the voltage output of the intermediate stage (5). Output sourcing and sinking stages (6 and 7) receive the voltage and current outputs of the interface stage (9), respectively, and produce high currents representative of the differential input signal. The combination of the high current outputs of the output sourcing and sinking stages (6 and 7) produces a high voltage output signal at the output terminal (8).

公开(公告)号：GB2302627B

公开(公告)日：2000-05-03

申请号：GB9512948

申请日：1995-06-24

Applicant: MOTOROLA INC

Inventor： HUYNH LUONG THIEN ,  LEHNING HEINZ

IPC: H03F3/20 ,  G06G7/12 ,  H03F3/30 ,  H03F3/343 ,  H03F3/42 ,  H03F3/45

Abstract: A high voltage operational amplifier receives a low voltage differential input signal at a low voltage transconductance stage (3) which provides a differential current output. An intermediate stage ( 5) has a differential current input coupled to the differential current output of the transconductance stage (3) via a voltage buffer stage (4) and produces a voltage output at a high voltage level but with low voltage swings providing a voltage representing the differential input signal. An interface stage (9) is coupled to receive the voltage output of the intermediate stage (5) and provides voltage and current outputs representing the voltage output of the intermediate stage (5). Output sourcing and sinking stages (6 and 7) receive the voltage and current outputs of the interface stage (9), respectively, and produce high currents representative of the differential input signal. The combination of the high current outputs of the output sourcing and sinking stages (6 and 7) produces a high voltage output signal at the output terminal (8).

公开(公告)号：GB2227137A

公开(公告)日：1990-07-18

申请号：GB8828917

申请日：1988-12-10

Applicant: MOTOROLA INC

Inventor： HUYNH LUONG THIEN

IPC: H03F3/30

Abstract: An amplifier output stage for a loudspeaker includes current sourcing (20) and sinking (70) sections arranged in push-pull and a cascode stage (50) for driving the current section and biasing both the sinking and sourcing sections.

公开(公告)号：GB2370704A

公开(公告)日：2002-07-03

申请号：GB0031469

申请日：2000-12-22

Applicant: MOTOROLA INC

Inventor： HUYNH LUONG THIEN

IPC: H03F3/30 ,  H03F3/45 ,  H03F3/50

Abstract: A unit-gain buffer circuit having as an output stage two NPN transistors Q3,Q5 of which the bases are driven by a first transconductance amplifier G1, transistor Q5 being biased by means of a third NPN transistor QB connected in series with a second transconductance amplifier G2 between the bases of the first two transistors. An arrangement consisting of transistor Q4 and current mirror circuit M compensates for current drawn from the base of Q3. PNP transistors may be used instead.

公开(公告)号：DE68927951T2

公开(公告)日：1997-10-16

申请号：DE68927951

申请日：1989-12-11

Applicant: MOTOROLA INC

Inventor： HUYNH LUONG THIEN

IPC: H03F3/30

Abstract: An amplifier output stage for a loudspeaker includes current sourcing (20) and sinking (70) sections arranged in push-pull and a cascode stage (50) for driving the current section and biasing both the sinking and sourcing sections.