摘要:
A voltage regulator includes an amplifier and a regulation loop. The regulator includes a first PMOS transistor connected to a terminal supplying an input voltage, a second PMOS transistor connected in series with the first PMOS transistor. A node between those two transistors defines an output terminal. A first source of a first polarization current of fixed value is connected to the gate of the first transistor, and a second source of a second polarization current of fixed value connects the second transistor to ground. A third NMOS transistor is connected between the two current sources. A circuit is provided to modify automatically at least one of the polarization currents in relation to the load current.
摘要:
A voltage regulator includes an amplifier and a regulation loop. The regulator includes a first PMOS transistor connected to a terminal supplying an input voltage, a second PMOS transistor connected in series with the first PMOS transistor. A node between those two transistors defines an output terminal. A first source of a first polarization current of fixed value is connected to the gate of the first transistor, and a second source of a second polarization current of fixed value connects the second transistor to ground. A third NMOS transistor is connected between the two current sources. A circuit is provided to modify automatically at least one of the polarization currents in relation to the load current.
摘要:
A circuit of generation of a reference voltage by a first MOS transistor connected to a first terminal of application of a supply voltage, the first transistor being in series with a second MOS transistor controlled by an input stage of a transconductance amplifier and their junction point defining an output terminal providing the reference voltage, a first current source connecting the first supply terminal to a gate of the first transistor, a second current source connecting the second transistor to a second terminal of application of the supply voltage, at least one third MOS transistor connecting the two current sources, and a capacitive element directly connecting the output terminal to a conduction terminal of the third transistor to vary the conduction of this third transistor in case of a variation in output voltage.
摘要:
A circuit of generation of a reference voltage by a first MOS transistor connected to a first terminal of application of a supply voltage, the first transistor being in series with a second MOS transistor controlled by an input stage of a transconductance amplifier and their junction point defining an output terminal providing the reference voltage, a first current source connecting the first supply terminal to a gate of the first transistor, a second current source connecting the second transistor to a second terminal of application of the supply voltage, at least one third MOS transistor connecting the two current sources, and a capacitive element directly connecting the output terminal to a conduction terminal of the third transistor to vary the conduction of this third transistor in case of a variation in output voltage.
摘要:
A circuit for generating a reference current, including, between two terminals of application of a supply voltage: at least a first branch formed of at least a first and of at least a second transistors in series; at least a second branch formed of at least a third and of at least a fourth transistors in series with a switched-capacitance circuit.
摘要:
A circuit of generation of a reference voltage by a first MOS transistor of a first type connected to a first terminal of application of a supply voltage. The first transistor is connected with a second MOS transistor of the same type controlled by an input stage of a transconductance amplifier and their junction point defines an output terminal providing the reference voltage. A first current source of fixed value connects the first supply terminal to the gate of the first transistor, a second current source of fixed value connecting the second transistor to a second terminal of application of the supply voltage.
摘要:
A differential amplifier having a first and second output terminals and receiving an input signal at an input terminal. The amplifier comprises a first amplifier having a first input connected to the input terminal, a second input and a first output connected together to the first output terminal, and a second output connected to the second output terminal, the first amplifier reproducing the input signal on the first output. The amplifier comprises a second amplifier having a first input receiving a reference signal and a second input connected to the output terminals by resistive elements and controlling the provision by the first amplifier on the second output of a signal such that the signals received at the first and second inputs of the second amplifier are equal.
摘要:
A controllable assembly of current sources includes several first output terminals, with a first transistor associated with each first output terminal, the current on each first output terminal depending on the current flowing through the first transistor, and a circuit configured, in response to a predetermined variation of a control voltage, to successively progressively turn on, then progressively turn off, each first transistor. The first transistors are MOS transistors, and each first output terminal is associated with a current mirror formed of MOS transistors, the current mirror providing to the first output terminal a current depending on the current flowing through the first transistor.
摘要:
A pulse width modulation device includes a switching transistor for defining modulation phases, a capacitor, and switches arranged to: a) in a first phase, charge the capacitor to a voltage corresponding to the on/off threshold of the switching transistor, and b) in a second phase, connect the capacitor between a terminal for applying a setpoint voltage and the gate of the switching transistor. A constant current source is connected to apply a current in the capacitor tending to bring the gate of the switching transistor toward the on/off threshold.
摘要:
A switched capacitor amplifier having an amplification unit adapted to amplify a differential signal; a first switched capacitor block including a first plurality of capacitors operable to sample a first differential input signal during a first sampling phase and to drive the amplification unit during a first drive phase; and a second switched capacitor block including a second plurality of capacitors operable to sample a second differential input signal during a second sampling phase and to drive the amplification unit during a second drive phase.