Abstract: A differential successive approximation analog to digital converter including: a comparator; a first plurality of capacitors coupled between a corresponding plurality of first switches and a first input of the comparator, at least one of the first capacitors being arranged to receive a first component of a differential input signal; and a second plurality of capacitors coupled between a corresponding plurality of second switches and a second input of the comparator, at least one of the second capacitors being arranged to receive a second component of the differential input signal, wherein each of the first and second plurality of switches are each adapted to independently couple the corresponding capacitor to a selected one of: a first supply voltage level; a second supply voltage level; and a third supply voltage level; and control circuitry adapted to sample the differential input voltage during a sample phase, and to control the first and second switches to couple each capacitor of the first and second plu

Abstract: A common-source circuit including two branches in parallel between a terminal of application of a voltage and a current source, each branch comprising: a series association of a resistor and a transistor, having their junction point defining an output terminal of the branch; a first switch connecting an input terminal of the branch to a control terminal of the transistor; and a controllable stage for amplifying data representing the level present on the output terminal of the opposite branch.

Abstract: An analog finite impulse response (AFIR) filter including at least one variable transconductance block having an input for receiving an input voltage and being adapted to sequentially apply each of a plurality of transconductance levels to the input voltage during at least one of a plurality of successive time periods to generate an output current at an output of the variable transconductance block, the at least one variable transconductance block including a plurality of fixed transconductance blocks each receiving the input voltage and capable of being independently activated to supply the output current; and a capacitor coupled to the output of the variable transconductance block to receive the output current and provide an output voltage of the filter.

Abstract: The invention concerns a circuit comprising: a first circuit block (302) adapted to receive a first clock signal (CLK1) and to provide a first output data signal at a time determined by said first clock signal; a second circuit block (304) adapted to receive a second clock signal (CLK2) and to provide a second output data signal at a time determined by said second clock signal; a clock bus (314) coupled to corresponding outputs of said first and second circuit blocks for receiving a third clock signal (BCLK) based on said first and second clock signals; and a synchronization unit (312) coupled to said clock bus and adapted to sample said first and second output data signals based on said third clock signal.

Abstract: A differential successive approximation analog to digital converter including: a comparator; a first plurality of capacitors coupled between a corresponding plurality of first switches and a first input of the comparator, at least one of the first capacitors being arranged to receive a first component of a differential input signal; and a second plurality of capacitors coupled between a corresponding plurality of second switches and a second input of the comparator, at least one of the second capacitors being arranged to receive a second component of the differential input signal, wherein each of the first and second plurality of switches are each adapted to independently couple the corresponding capacitor to a selected one of: a first supply voltage level; a second supply voltage level; and a third supply voltage level; and control circuitry adapted to sample the differential input voltage during a sample phase, and to control the first and second switches to couple each capacitor of the first and second plu

Abstract: A method of successive approximation analog to digital conversion including: during a sample phase, coupling an input signal to a plurality of pairs of capacitors; and during a conversion phase, coupling a first capacitor of each pair to a first supply voltage, and a second capacitor of each pair to a second supply voltage.

Abstract: A common-source circuit including two branches in parallel between a terminal of application of a voltage and a current source, each branch comprising: a series association of a resistor and a transistor, having their junction point defining an output terminal of the branch; a first switch connecting an input terminal of the branch to a control terminal of the transistor; and a controllable stage for amplifying data representing the level present on the output terminal of the opposite branch.

Abstract: An analog finite impulse response (AFIR) filter including at least one variable transconductance block having an input for receiving an input voltage and being adapted to sequentially apply each of a plurality of transconductance levels to the input voltage during at least one of a plurality of successive time periods to generate an output current at an output of the variable transconductance block, the at least one variable transconductance block including a plurality of fixed transconductance blocks each receiving the input voltage and capable of being independently activated to supply the output current; and a capacitor coupled to the output of the variable transconductance block to receive the output current and provide an output voltage of the filter.

Abstract: An analog finite impulse response filter including at least one variable transconductance block having an input for receiving an input voltage and being adapted to sequentially apply each of a plurality of transconductance levels to the input voltage during at least one of a plurality of successive time periods to generate an output current at an output of the variable transconductance block, the at least one variable transconductance block including a plurality of fixed transconductance blocks each receiving the input voltage and capable of being independently activated to supply the output current; and a capacitor coupled to the output of the variable transconductance block to receive the output current and provide an output voltage of the filter.

Abstract: The method and device include the filtering and the analog/digital conversion of an intermediate signal. The intermediate signal is processed by a filtering and analog/digital conversion circuit that is configurable using switched passive capacitor technology. The various configurations successively adopted by the circuit provide filtering and analog/digital conversion to be successively carried out.

Abstract: The method and device include the filtering and the analog/digital conversion of an intermediate signal. The intermediate signal is processed by a filtering and analog/digital conversion circuit that is configurable using switched passive capacitor technology. The various configurations successively adopted by the circuit provide filtering and analog/digital conversion to be successively carried out.

Abstract: A chainable adder receives bits (A, B, C) to give complementary sum outputs (SO, SO*) and carry outputs (CO, CO*). A first stage has differential pairs (P1, P2, P3) receiving bits (A, B, C), respectively, and complements (A*, B*, C*), respectively. The pairs have common output arms and are powered by an identical current (I). First and second output arms include resistors (R1, R2, R3) and (R4, R5, R6), respectively, connected-in-series to a reference potential (M). The resistors define intermediate nodes (A1, A2, A3) in the first arm, (B1, B2, B3) in the second arm. Carry outputs are taken at nodes (A2, B2). A second stage has differential pairs (P4, P5, P6) whose inputs are connected to nodes (A1, B3) for pair (P4), (A2, B2) for pair (P5), and (A3, B1) for pair (P6). Pairs (P4, P6) each have a common arm with the pair (P5) and a non-common arm.

Abstract: A signal aliasing circuit that can be used especially to make a series interpolation cell of an interpolation analog-digital converter comprises two pairs of differential arms powered by one and the same current source connected to a first power supply terminal, each pair comprising two transistors, the transistors of one pair being parallel-connected with the transistors of the other pair. Each group of two parallel-connected transistors is connected by a respective common resistor to a second power supply terminal, the two outputs of the aliasing circuit being the combined collectors of the two groups of parallel-connected transistors. The disclosed device can be applied especially to converters whose architecture comprises what is known as a series interpolation part requiring high precision.

Abstract: A sample-and-hold device comprises a sampling transistor (Qech) and a sampling capacitor (Cech), the sampling transistor being off in hold mode in order to prevent the discharging of the sampling capacitor and conductive in sampling mode to apply a voltage to the capacitor that is substantially equal to the voltage (Vech) at its base.

Abstract: Disclosed is an analog to digital converter with several cascade-connected interpolation and selection circuits. The function of an interpolation circuit is to produce five pairs of output signals from three pairs of input signals and select three pairs from among the five pairs to apply them to the next stage. Each pair comprises two interpolation signals that vary symmetrically and monotonically as a function of the voltage Vin, the signals of one pair being equal when the voltage Vin is equal to a reference voltage associated with this pair. There are five reference voltage associated with the five pairs. Among these five reference voltages, the three reference voltages (and therefore also the three corresponding pairs of signals) that most closely surround the input voltage Vin are selected. The reference voltages are increasingly closer together as the operation progresses in the succession of cascade-connected stages.

Abstract: The invention concerns precision analogue-digital converters. For the fine conversion, supplying the low order bits (B0 to Bk) for an analogue voltage Vin to be converted, three ordinary differential amplifiers (ADA, ADB, ADC) are used connected to three voltage references VR(i-1), VR(i), VR(i+1). These three amplifiers supply differential output voltages (VAa, VAb, VBa, VBb, VCa, VCb) that vary as a function of Vin according to normal transfer functions for differential amplifiers. Intersection points of these various transfer curves are detected in interpolation circuits (firstly CIT1, then CIT2, etc). These intersection points are used as intermediate voltage references between the main references. Comparators (CMP0 . . . CMPk), placed at the output of interpolation circuits supply bits (B0 to Bk) indicating the value of Vin with respect to each of these intermediate references.