Stmicroelectronics S.a.

Sgs-thomson Microelectronics S.a.

Semiconductor Components Industries, LLC

Pascal Debaty

Christophe Garnier

Gerard Bret

Patrick Bernard

Christian Perrin

Pierre Daude

In one embodiment, a circuit is formed to couple a battery to a charging voltage at least a portion of a time when the charging voltage is greater than zero volts and is less than a first voltage value. The circuit is also formed to decouple the battery from the charging voltage approximately when the charging voltage is greater than the first voltage and also approximately when the charging voltage is no greater than zero volts.

Battery protection method and circuit therefor

A voltage ramp generator includes a capacitance and a charging circuit that permits generation of a charging current for the capacitance. The charging circuit for the capacitance includes a current generator having a resistance RgThe charging circuit for the capacitance includes components, such as resistance Re, that enables the capacitance charging current to be proportional to (Re/Rg). The voltage ramp generator is applicable to circuits for DC voltage converters operating in a current mode.

Voltage ramp generator and current ramp generator including such a generator

A circuit for splitting poles between a first stage and a second inverting voltage-amplifier stage of an electronic circuit, comprises, in series between the output of the first stage and the output of the second stage, and in that order, a first capacitor, a second capacitor and a resistor. The circuit further comprises a voltage-divider bridge which is connected between a terminal delivering a substantially constant voltage and the output of the first stage. The output of the voltage-divider bridge is linked to the common node between the first capacitor and the second capacitor, in such a way that a first resistor of the voltage-divider bridge is connected in parallel with the first capacitor.

Miller effect-based circuit for splitting poles

A circuit for shifting at least one input switching signal includes a CMOS bistable circuit having two branches, and a circuit for accelerating the switching of the bistable circuit. The circuit for accelerating the switching allows an output transistor of each branch to be switched to the off state when an input transistor of the branch switches to the on state. The circuit for accelerating switching includes, for at least one given branch, an associated current mirror generating a turn-off current for the output transistor of the branch on the basis of a turn-on current for the input transistor of the branch.

Circuit for shifting switching signals

A bandpass filter includes a first and a second transconductor. The first transconductor has a first input connected to ground, and a second input connected to a second input of the second transconductor and to the output of the filter. An output of the first transconductor is connected to a first input of the second transconductor, and to an input of a filter through a first capactor. The output of the second transconductor is connected to ground through a second capacitor, and to a monitor amplifier. An output of the monitor amplifier is connected to the output of the filter. The bandpass filter further includes a third capacitor arranged between the second input and the output of the first transconductor, and a splitter bridge connected to the second input of the second transconductor.

Bandpass filter with transconductors

The present invention relates to a voltage-controlled phase shifter including two differential stages, each including a biasing branch and output branches coupled with the output branches of the other stage; two first resistors coupling the output branches to a first supply potential; a first capacitor connected between the output branches; two second resistors connected in series between the biasing branches; a second capacitor connected in series between the two second resistors; means for applying an input signal in the form of a differential current across the second capacitor; and means for supplying, as an output signal, the sum of the current in one of the first resistors and of a predetermined fraction of a corresponding component of the differential current constituting the input signal.

Voltage-controlled phase shifter

A phase/frequency comparator includes: two inputs which respectively receive first and second logic signals; a first logic gate which is at an active state during a duration equal to the phase advance of the first signal with respect to the second signal; and a second logic gate which is at an active state during a duration equal to the phase advance of said second signal with respect to the first signal. The phase/frequency comparator also includes: a first switching element operated by the active state of the second gate to prevent transmission to the first gate a state liable to switch the first gate to its active state; and a second switching element operated by the active state of the first gate to prevent transmission to the second gate a state liable to switch the second gate to its active state.

Phase/frequency comparator

A frequency locked loop includes a phase comparator receiving first and second periodic signals and having a first output providing pulses if the first signal is in phase advance with respect to the second signal and a second output providing pulses in the opposite case; an oscillator providing the second signal; a counter, the state of which determines the frequency of the oscillator, having an incrementation input and a decrementation input; and a sampling circuit for transmitting each Nth of the pulses either to the incrementation input if the pulse occurs at one of the first and second outputs of the comparator, or to the decrementation input if the pulse occurs at the other of the first and second outputs.

Growing community of inventors

Domene, France

Pascal Debaty