Abstract: A low-noise reference voltages distribution circuit has a multi-output voltage-to-current converter configured to receive an input reference voltage and to provide a plurality of output reference currents to be converted into a plurality of local reference voltages by corresponding receiving circuits. The converter includes an input section, an output section and a low-pass filter. The input section generates a reference current based on the input reference voltage, and has a current mirror input transistor having a voltage controlled input terminal. The output section includes a plurality of current mirror output transistors outputting reference currents to the plurality of reference currents, respectively, and having a voltage controlled input terminal connected to a common input node. The low-pass filter has an input node connected to the voltage controlled input terminal of the current mirror input transistor and an output node connected to the common input node.

Abstract: An interface circuit is provided that is adapted to connect a microphone circuit to a preamplifier. The microphone circuit has a microphone and at least an output node and the preamplifier has at least an input node connected to the output node by the interface circuit. The interface circuit has at least a decoupling capacitor for DC decoupling the input node from the output node. The decoupling is connected between the input node and the output node. The interface circuit has at least one active circuit, comprising a resistor connected the decoupling capacitor. The resistor acts as part of a resistance multiplier and has an equivalent resistance that together with the decoupling capacitor defines a high-pass filter connected between the microphone and the preamplifier. The interface circuit may also have a biasing circuit connected to the resistor.

Abstract: The invention relates to a circuit (100) for use with a loudspeaker (104) having a first differential input terminal (t1) and a second differential input terminal (t2), the circuit (100) comprising: a differential power amplifier (103) having a first differential output terminal (t3) operatively connected to the first differential input terminal (t1) of the loudspeaker (104) and a second differential output terminal (t4) operatively connected to the second differential input terminal (t2) of the loudspeaker (104);—a first resistor (RS1) disposed between the first differential output terminal (t3) of the differential power amplifier (103) and the first differential input terminal (t1) of the loudspeaker (104); a second resistor (RS2) disposed between the second differential output terminal (t4) of the differential power amplifier (103) and the second differential input terminal (t2) of the loudspeaker (104).

Abstract: A MEMS acoustic transducer device has a capacitive microelectromechanical sensing structure and a biasing circuit. The biasing circuit includes a voltage-boosting circuit that supplies a boosted voltage on an output terminal, and a high-impedance insulating circuit element set between the output terminal and a terminal of the sensing structure, which defines a first high-impedance node associated with the insulating circuit element. The biasing circuit has: a pre-charge stage that generates a first pre-charge voltage on a first output thereof, as a function of, and distinct from, the boosted voltage; and a first switch element set between the first output and the first high-impedance node. The first switch element is operable for selectively connecting the first high-impedance node to the first output, during a phase of start-up of the biasing circuit, for biasing the first high-impedance node to the first pre-charge voltage.

Abstract: An electronic analog-to-digital conversion device includes an analog-to-digital conversion block having a first input for receiving a voltage signal to be converted based on a reference voltage signal provided to a second input, and an input block connected to the first input of the analog-to-digital conversion block. The input block receives an input signal at a first resistive network connected to a second resistive network, which is then connected to a reference potential. The input block also includes an active network connected between an output of the first resistive network and the first input of the analog-to-digital conversion block. The active network has a first input terminal directly connected to the second input of the analog-to-digital conversion block for receiving the same reference voltage signal so that the input voltage signal received at a second input of the active network is processed based on the reference voltage signal.

Abstract: Differential output stage (200) of an amplification device, for driving a load, comprises a first (201) and a second (202) differential output stage portion. The first differential output stage portion (201) comprises: a first (M1PSW) and a second (M1NSW) output circuit; a first driving circuit (210) comprising a first biasing circuit (M2P, M3N, M4N, R11, I11); a second driving circuit (220) comprising a second biasing circuit (I41, R41, M4P, M3P, M2N).

Abstract: The invention relates to a two-stage operational amplifier (400) in class AB for driving a load (RLB, RLA) comprising: an input stage (401) comprising differential input terminals (IN, 1P) and a first differential output terminal (O1P) and a second differential output terminal (O1N) for providing a first differential driving signal (Out1P) and a second differential driving signal (Out1N), respectively; an output stage (402) comprising a first output branch (403) having a first differential input terminal (I1P) operatively connected to the first differential output terminal (O1P) of the input stage (401) to receive the first differential driving signal (OUT1P) and a second output branch (404) having a second differential input terminal (I1N) operatively connected to the second differential output terminal (O1N) of the output stage (401) to receive the second differential driving signal (Out1N), —a control circuit (405) configured to control the output stage (402).

Abstract: The present disclosure relates to an electronic analog-to-digital conversion device (100) which comprises: an analog-to-digital conversion block (101) having a first input (1) for receiving a voltage signal (Vout) to be converted on the basis of a reference voltage signal (VREF) provided to a second input (2) of the same analog-to-digital conversion block (101);—an input block (102) having an input terminal (3) and an output terminal (4) connected to the first input (1) of the analog-to-digital conversion block (101). The input block (102) is arranged for processing an input voltage signal (Vin) applied to the input terminal (3) to generate the voltage signal (Vout) at the output terminal (4). The input block (102) comprises:—a first resistive network (103) operatively connected to both the input terminal (3) and the output terminal (4);—a second resistive network (104) connected between the output terminal (4) and a reference potential (GND).

Abstract: An analog input voltage is converted to a digital code by, generating a first set of confirmed bits based on a first series of comparisons of an output of a digital-to-analog converter with the analog input voltage and generating a second set of confirmed bits based on a second series of comparisons of the output of the digital-to-analog converter with the analog input voltage. The first set of confirmed bits is independent of the second series of comparisons. The bits of the digital output code corresponding to the analog input voltage are generated based on the first set of confirmed bits, the second set of confirmed bits and a constant value representative of a voltage shift introduced in the digital-to-analog converter between the first series of comparisons and the second series of comparisons.

Abstract: The invention relates to an electronic integrated amplifier for driving an acoustic transducer. The amplifier comprises two differential input terminals to receive an input signal and a first and a second output terminal to provide an output signal to the transducer. In addition, the amplifier comprises an operational amplifier having an input end including differential inputs and an output end operatively associated with the first and second output terminals. A pair of input resistors connect the two differential input terminals to two intermediate terminals, respectively. A pair of feedback resistors connect the first and second output terminals to the two intermediate terminals, respectively. The integrated amplifier also comprises means for high-pass filtering the input signal.

Abstract: The invention relates to a two-stage operational amplifier (400) in class AB for driving a load (RLB, RLA) comprising: an input stage (401) comprising differential input terminals (IN, lp) and a first differential output terminal (O1P) and a second differential output terminal (O1N) for providing a first differential driving signal (Out1P) and a second differential driving signal (Out1N), respectively; an output stage (402) comprising a first output branch (403) having a first differential input terminal (I1P) operatively connected to the first differential output terminal (O1P) of the input stage (401) to receive the first differential driving signal (OUT1P) and a second output branch (404) having a second differential input terminal (I1N) operatively connected to the second differential output terminal (O1N) of the output stage (401) to receive the second differential driving signal (Out1N), a control circuit (405) configured to control the output stage (402).

Abstract: A low-noise reference voltages distribution circuit (10) is disclosed, comprising a multi-output voltage to current converter (V/I_Conv) adapted to receive an input reference voltage (VR) for providing a plurality of output reference currents (I1, . . . , IN) to be converted into a plurality of local reference voltages (V01, V0N) at corresponding receiving circuits (LCR1, LCRN) adapted to be connected to said reference voltages distribution circuit (10). The multi-output voltage to current converter (V/I_Conv) comprises: -an input section (20) adapted to generate on the basis of said input reference voltage (VR) a reference current (I0), the input section (20) comprising a current mirror input transistor (M0E) having a voltage controlled input terminal (g0E); -an output section (50) comprising a plurality of current mirror output transistors (M01, M0N) each adapted to provide a corresponding output reference current of said plurality of reference currents (I1, . . .

Abstract: A single-ended to differential buffer circuit is disclosed, adapted to couple at least an input analog signal to a receiving circuit. The buffer circuit comprises an output section comprising a differential amplifier having a first and a second input, a first and a second output. The buffer circuit further comprises an input section comprising a first and a second switched capacitor, each adapted to sample said input analog signal and having a first side and a second side, the first sides of the first and second switched capacitors being controllably connectable/disconnectable to/from said first and second outputs respectively. In the buffer circuit the second sides of said first and second switched capacitors are controllably connectable/disconnectable to/from said first and second inputs of the differential amplifier respectively.

Abstract: The invention relates to a circuit (100) for use with a loudspeaker (104) having a first differential input terminal (t1) and a second differential input terminal (t2), the circuit (100) comprising: a differential power amplifier (103) having a first differential output terminal (t3) operatively connected to the first differential input terminal (t1) of the loudspeaker (104) and a second differential output terminal (t4) operatively connected to the second differential input terminal (t2) of the loudspeaker (104);—a first resistor (RS1) disposed between the first differential output terminal (t3) of the differential power amplifier (103) and the first differential input terminal (t1) of the loudspeaker (104); a second resistor (RS2) disposed between the second differential output terminal (t4) of the differential power amplifier (103) and the second differential input terminal (t2) of the loudspeaker (104).

Abstract: An electronic USB or similar device 101 with a CMOS audio output stage 105 for driving, in a first mode, e.g., a headset via a port commonly used also in a second mode by a digital data transmission stage 103 for digital data and supply, the audio output stage P-channel transistor MP being switchably back-gate biased by a bias circuit 107 according to the operating mode to achieve high-voltage tolerance.

Abstract: The invention relates to a two stage class AB operational amplifier for driving a load, comprising at least an input stage comprising differential input terminals and an output terminal to provide a driving signal. In addition, the operational amplifier comprises an output stage comprising a first and second input terminals operatively associated to the input stage to be driven on the basis of said driving signal and a driving circuit operatively interposed between said input stage and the output stage. The operational amplifier is characterized in that the driving circuit comprises a first portion comprising at least one resistor operatively connected between a first reference potential via a first circuitry block comprising a PMOS transistor and a second reference potential via a second circuitry block comprising a NMOS transistor.

Abstract: A microphone preamplifier circuit (60) is described, adapted to be connected to a microphone circuit (MCD), the microphone circuit (MCD) comprising a microphone (3) and at least one output node (MO, MO?).

Abstract: The present disclosure relates to an electronic regulation device of a variable capacitance of an integrated circuit having a time parameter depending on the variable capacitance. The regulation device includes a regulation loop, and is configured to generate in output a plurality of binary regulation signals.

Abstract: The invention relates to a two stage class AB operational amplifier (200) for driving a load (L), comprising at least an input stage (201) comprising differential input terminals (IN+, IN?) and an output terminal (N) to provide a driving signal (VN). In addition, the operational amplifier comprises an output stage (202) comprising a first (A) and second (B) input terminals operatively associated to the input stage (201) to be driven on the basis of said driving signal (VN) and a driving circuit (203) operatively interposed between said input stage (201) and the output stage (202). The operational amplifier is characterised in that the driving circuit (203) comprises a first portion (204) comprising at least one resistor (R1) operatively connected between a first reference potential (Vcc) via a first circuitry block (MT, M11) comprising a PMOS transistor (MT) and a second reference potential (GND) via a second circuitry block (M12, MS) comprising a NMOS transistor (MS).

Abstract: An apparatus (100) for protecting a circuit (200) from an input volume comprises a switchable element (10) arranged to couple the input voltage (VIN) to the circuit (200) in response to a first control signal (DRV1) having a first value and to decouple the input voltage (VIN) from the circuit (200) in response to the first control signal (DRV1) having a second value. A monitor stage (20) compares a monitored voltage (VMON) to a threshold (VIN). A controller (30) provides the first control signal (DRV1) to the switchable element (10), the first control signal (DRV1) having the first value when the monitored voltage (VMON) is on one side of the threshold (VTH), wherein the first value is independent of the input voltage (VIN) and the second value is equal to the input voltage (VIN).