摘要:
The device described permits selection between two design options of an integrated circuit by causing a corresponding circuit unit of the integrated circuit to adopt one of two possible different operative states. It comprises an inverter, of which the output terminal is connected to the control terminal of the circuit unit and the input terminal is connected to a first supply terminal by means of a conductor which can be broken by means outside the integrated circuit, and to the second supply terminal by means of a capacitor in parallel with a diode connected for reverse conduction. The device described does not require control signals, takes up a very small area, has practically zero consumption, and can be formed in unlimited numbers on the same integrated circuit.
摘要:
An area-efficient low-pass, time-invariant, second-order reconstruction filter, particularly for current-driven digital-to-analog converters, including: a first resistor and a first capacitor which are parallel connected; an operational amplifier; a terminal of a second resistor which is connected to the inverting input of the operational amplifier; another terminal of the second resistor which is connected to a common node of the first resistor and the first capacitor; a second capacitor, which is ffeedback-connected between the output of the operational amplifier and the inverting input; and an additional pair of resistors which are arranged so as to provide feedback between the output and the inverting input, a current signal arriving from a digital-to-analog converter arranged upstream of the reconstruction filter being fed to a common node of the additional pair of resistors.
摘要:
The device permits selection between two design options of an integrated circuit by causing a corresponding circuit unit of the integrated circuit to adopt one of two possible different operative states. More specifically, the device provides an inverter, of which the output terminal is connected to the control terminal of the circuit unit and the input terminal is connected to first and second supply terminals, via a conductor and a capacitor, respectively. The conductor can be broken by means outside the integrated circuit, and the capacitor is connected in parallel with a diode connected for reverse conduction. The device does not require control signals, takes up a very small area, has practically zero consumption, and can be formed in unlimited numbers on the same integrated circuit.
摘要:
Electronic switch for low-voltage supply circuits completed with CMOS technology and comprising a first, a second and a third circuit element (SW1 ,SW2,SW3) consisting each of a pair of complementary transistors. The first and second of said elements (SW1,SW2) are inserted between two connection terminals of the switch (A,B) while the third element SW3 is inserted between a node (C) included between the first and the second element of a voltage reference (VCM). The first and second element are driven to conduction in phases (.phi.1) not overlapping the phases (.phi.2) in which it conducts the third element.
摘要:
An initialization circuit for memory registers, having a signal input being applied a supply voltage which rises linearly from a null value, and an initializing output connected to an input of a memory register and on which a voltage signal, being equal or proportional to the supply voltage, during the initialization step, and a null voltage signal, upon the supply voltage dropping below a predetermined tripping value, are produced. Additionally, the circuit has, between the input and the output, a first circuit portion connected to the input; a second circuit portion connected after the first and having a first output connected to the initializing output; and a third, inverting circuit portion having an input connected to a second output of the second portion and an output connected to the first portion to hold off that first portion while the supply voltage drops below the threshold voltage.
摘要:
An integrated circuit includes a substrate of semiconductive material, a first circuit environment made from the substrate which includes an output terminal and a first pair of power supply terminals for receiving a first power supply voltage applicable between the terminals. The integrated circuit also includes a second circuit environment made from the semiconductor substrate which includes an input terminal electrically coupled to the output terminal and also includes a second pair of power supply terminals for receiving a second power supply voltage applicable between the second pair of terminals of said second pair. The circuit further includes a device providing protection from electrostatic discharges which includes an integrated resistive device coupled between the input and output terminals.
摘要:
An integrated circuit includes a substrate of semiconductive material, a first circuit environment made from the substrate which includes an output terminal and a first pair of power supply terminals for receiving a first power supply voltage applicable between the terminals. The integrated circuit also includes a second circuit environment made from the semiconductor substrate which includes an input terminal electrically coupled to the output terminal and also includes a second pair of power supply terminals for receiving a second power supply voltage applicable between the second pair of terminals of said second pair. The circuit further includes a device providing protection from electrostatic discharges which includes an integrated resistive device coupled between the input and output terminals.
摘要:
A digital-to-analog converter includes a first section (MSB) that converts the more significant bits of a digital code into a first voltage (Vin) of a multiplicity of discrete voltages that are integral multiples of a predetermined first voltage step (ΔV1). A second section (LSB) of the converter converts the less significant bits of the digital code into a current. The current is transformed into a second voltage of a multiplicity of discrete voltages that are integral multiples of a second voltage step (ΔV2) equal to ½ L of the product of the first voltage step (ΔV1) multiplied by a predetermined coefficient, where L is the number of the less significant bits of the digital code to be converted. A summer generates an output voltage (Vout) that is the sum of the second voltage and the product of the first voltage multiplied by the predetermined coefficient. With a view to obtaining a low consumption, the summer has a resistive feedback circuit including a voltage divider (R3, R4). A conversion resistor (R4) that forms part of the voltage divider transforms the current into the second voltage.
摘要:
A digital-to-analog converter includes a first section (MSB) that converts the more significant bits of a digital code into a first voltage (Vin) of a multiplicity of discrete voltages that are integral multiples of a predetermined first voltage step (ΔV1). A second section (LSB) of the converter converts the less significant bits of the digital code into a current. The current is transformed into a second voltage of a multiplicity of discrete voltages that are integral multiples of a second voltage step (ΔV2) equal to ½ L of the product of the first voltage step (ΔV1) multiplied by a predetermined coefficient, where L is the number of the less significant bits of the digital code to be converted. A summer generates an output voltage (Vout) that is the sum of the second voltage and the product of the first voltage multiplied by the predetermined coefficient. With a view to obtaining a low consumption, the summer has a resistive feedback circuit including a voltage divider (R3, R4). A conversion resistor (R4) that forms part of the voltage divider transforms the current into the second voltage.
摘要:
An area-efficient reconstruction filter removes undesirable sample images produced by current-driven digital-to-analog converters. The reconstruction filter includes: an input node for receiving the input current signal; an operational amplifier having first and second inputs and an output at which the output voltage signal is produced; a first resistor coupled between the output of the operational amplifier and the input node; a second resistor coupled to the first input of the operational amplifier; and a third resistor coupled between the input node and the second resistor. The reconstruction filter may also include a fourth resistor coupled between the input node and a reference voltage.