公开(公告)号：DE69422164D1

公开(公告)日：2000-01-20

申请号：DE69422164

申请日：1994-05-31

Applicant: ST MICROELECTRONICS SRL

Inventor： ROSSI DOMENICO ,  TAHARA HISASHI

IPC: H01L27/04 ,  H01L21/822 ,  H01L29/78 ,  H01L29/92 ,  H02M3/07

Abstract: A BiCMOS capacitive charge pump circuit for low supply voltage has a bipolar part, functionally reproducing a basic charge pump circuit and a CMOS part that comprises MOS transistors (M1, M2) functionally connected in parallel with the driving switch toward ground potential (T3) of the charge transfer capacitance (C1) and in parallel with the output diode (T7) for substantially nullifying voltage drops on the respective bipolar components (T3, T7). A special driving circuit (T8, R2, I2), powered at the boosted output voltage (VOUT) responds to the rise of the voltage on the output node above a minimum level, as ensured by the bipolar part of the charge pump circuit, to drive said MOS transistors (M1, M2), thus allowing the output voltage to reach a level that is substantially double the supply voltage (Vs), also when the latter is exceptionally low for reliably ensuring switching of the CMOS part of the circuit.

公开(公告)号：DE69229731D1

公开(公告)日：1999-09-09

申请号：DE69229731

申请日：1992-09-16

Applicant: ST MICROELECTRONICS SRL

Inventor： ONETTI ANDREA MARIO ,  ROSSI DOMENICO

IPC: H03F1/26 ,  H03F1/02 ,  H03F3/45 ,  H03G3/20 ,  H03G3/30 ,  H03G5/16 ,  H03F1/32

Abstract: The dynamic range of operation of a transconductance differential input stage is reduced when the amplitude of the input signal decreases, thus reducing the level of the noise that is generated by the input stage. A DC signal representaive of the sensed amplitude of the input signal is employed for either reducing the value of a common, emitter-degenerating resistance (R) or of the bias current that is forced in the two branches of the differential input stage.

公开(公告)号：DE69414236T2

公开(公告)日：1999-03-25

申请号：DE69414236

申请日：1994-05-06

Applicant: ST MICROELECTRONICS SRL

Inventor： PEDRAZZINI GIORGIO ,  SCROCCHI GIUSEPPE ,  CORDINI PAOLO ,  ROSSI DOMENICO

IPC: G05F1/56 ,  H02M1/08 ,  H02M3/155 ,  H02M3/156

公开(公告)号：DE69414236D1

公开(公告)日：1998-12-03

申请号：DE69414236

申请日：1994-05-06

Applicant: ST MICROELECTRONICS SRL

Inventor： PEDRAZZINI GIORGIO ,  SCROCCHI GIUSEPPE ,  CORDINI PAOLO ,  ROSSI DOMENICO

IPC: G05F1/56 ,  H02M1/08 ,  H02M3/155 ,  H02M3/156

公开(公告)号：DE69533507D1

公开(公告)日：2004-10-21

申请号：DE69533507

申请日：1995-06-30

Applicant: ST MICROELECTRONICS SRL

Inventor： RICOTTI GIULIO ,  BARDELLI ROBERTO ,  ROSSI DOMENICO

IPC: G06K19/07 ,  H03K17/687

公开(公告)号：DE69229731T2

公开(公告)日：1999-12-23

申请号：DE69229731

申请日：1992-09-16

Applicant: ST MICROELECTRONICS SRL

Inventor： ONETTI ANDREA MARIO ,  ROSSI DOMENICO

IPC: H03F1/26 ,  H03F1/02 ,  H03F3/45 ,  H03G3/20 ,  H03G3/30 ,  H03G5/16 ,  H03F1/32

Abstract: The dynamic range of operation of a transconductance differential input stage is reduced when the amplitude of the input signal decreases, thus reducing the level of the noise that is generated by the input stage. A DC signal representaive of the sensed amplitude of the input signal is employed for either reducing the value of a common, emitter-degenerating resistance (R) or of the bias current that is forced in the two branches of the differential input stage.

公开(公告)号：DE69032087T2

公开(公告)日：1998-10-08

申请号：DE69032087

申请日：1990-12-13

Applicant: ST MICROELECTRONICS SRL

Inventor： MURARI BRUNO ,  ROSSI DOMENICO ,  SAVINO PIERANTONIO

IPC: G11B5/02 ,  H03F3/181 ,  H03F3/343 ,  G11B5/027 ,  H03F3/45

Abstract: A low-noise preamplifier stage, in particular for magnetic heads, which comprises a differential circuit (T5,T6) and a single-transistor output stage (T2). The differential stage has an intrinsic offset voltage, is ground-connectable and can be directly coupled to the magnetic head (L) , the two transistors forming the differential circuit (T5,T6) having different bias currents in order to reduce the input equivalent noise. The base terminal of the first transistor (T5) of the differential circuit defines an input (IN) of the stage which can be connected directly to a terminal of the magnetic head (L); the other terminal of the head can be connected directly to the ground. The base terminal of the other transistor (T6) of the differential circuit (T5,T6) is connected to the intermediate point of a pair of resistors (R1,R2) which are mutually connected in series between the single transistor of the output stage (T2) and a line at reference voltage. In this manner the differential stage (T5,T6) biases the output with its offset voltage without requiring additional components for this purpose.

公开(公告)号：DE69320326D1

公开(公告)日：1998-09-17

申请号：DE69320326

申请日：1993-05-07

Applicant: ST MICROELECTRONICS SRL

Inventor： ROSSI DOMENICO ,  TATEOKA MASAYUKI

IPC: G01R19/165 ,  H03K3/0233 ,  H03K5/08 ,  H03K3/023 ,  H03K5/24

公开(公告)号：DE69316630T2

公开(公告)日：1998-05-07

申请号：DE69316630

申请日：1993-11-29

Applicant: ST MICROELECTRONICS SRL

Inventor： ROSSI DOMENICO ,  TANAKA KAZUYUKI

IPC: H02M3/155 ,  H02M3/158 ,  H02M1/00

Abstract: A DC-DC boost converter for directly driving a capacitive load employs four switches for cyclically commuting the connection configuration of an energy storing inductor. First and second switches are driven at a relatively high frequency and provide an impulsive charge path of the inductor by connecting one or the other end to a power supply rail. Third and fourth switches are driven in phase opposition to each other at a relatively low frequency and provide a discharge path from one and the other end of the inductor, respectively, toward an output node of the circuit to which the capacitive load is connected.