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公开(公告)号：DE60134495D1
公开(公告)日：2008-07-31
申请号：DE60134495
申请日：2001-11-29
Applicant: ST MICROELECTRONICS SA
Inventor： MOURET MICHEL , SABUT MARC , VAN ZANTEN FRANCOIS
IPC: H03G7/06
Abstract: 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.
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公开(公告)号：DE60127724D1
公开(公告)日：2007-05-16
申请号：DE60127724
申请日：2001-12-14
Applicant: ST MICROELECTRONICS SA
Inventor： MOURET MICHEL , SABUT MARC , VAN ZANTEN FRANCOIS
Abstract: A variable-gain amplifier with a differential input and differential output, including an attenuator block, receiving an input voltage and providing, on several outputs, voltages, each of which is equal to the attenuated input voltage; differential transconductor elements, each having a first input connected to a respective output of the attenuator block, and generating first and second positive currents and first and second negative currents; a current source assembly adapted to controlling the transconductance of each differential transconductor element according to an analog control signal; and an output block converting first and second input currents into a differential output voltage and providing a second input of each differential transconductor element with a feedback voltage depending on the output voltage.
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公开(公告)号：FR2856855A1
公开(公告)日：2004-12-31
申请号：FR0350271
申请日：2003-06-27
Applicant: ST MICROELECTRONICS SA
Inventor： SABUT MARC , VAN ZANTEN FRANCOIS , MORO JEAN LUC
Abstract: A device for controlling a voltage-controlled switch from a digital signal, comprising: a first means for providing the digital signal to the output terminal of the switch; a second means for biasing the switch control terminal to a level greater than the threshold voltage of the switch and smaller than the sum of said threshold voltage and of the maximum voltage of the digital signal; and a third means for adding or subtracting to said level said maximum voltage of the digital signal respectively at the rising and falling edges of the logic inverse of the digital signal.
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公开(公告)号：FR2854008A1
公开(公告)日：2004-10-22
申请号：FR0304829
申请日：2003-04-17
Applicant: ST MICROELECTRONICS SA
Inventor： VAN ZANTEN FRANCOIS
Abstract: An amplifier circuit comprising an amplification chain having a differential output stage; a common mode correction block acting on the input of the output stage as a function of a common mode voltage at the output of said stage and introducing a phase shift between its input and its output for frequencies close to the cut-off frequency of the circuit; and, in parallel with the correction block, a means introducing no phase shift between its input and its output and having at frequencies greater than or equal to the circuit cut-off frequency an output impedance much smaller than the output impedance of the correction block.
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公开(公告)号：FR2835667A1
公开(公告)日：2003-08-08
申请号：FR0201516
申请日：2002-02-07
Applicant: ST MICROELECTRONICS SA
Inventor： RAVATIN JEAN , MOURET MICHEL , VAN ZANTEN FRANCOIS
Abstract: The filter is set up by firstly operating in oscillator mode, during which time the oscillator frequency is measured. The characteristics of the filter are adjusted in order to match the required cut-off frequency for the filter, as closely as possible, within a determined degree of tolerance. The filter control procedure includes a phase in which the filtering circuit (FF10) operates as an oscillator, and the frequency of operation of the oscillator is determined. The characteristics of the device are then corrected, taking account of the measured frequency of oscillation and a predetermined relationship between the frequency of oscillation and the theoretical cut-off frequency of the filter. This gives the circuit a cut-off frequency which is equal to the frequency of oscillation, within a close tolerance. After this adjustment phase, the filter moves into a working phase, in which the filter carries out its filtering function. When the filter has an order greater than three, the filter operates in oscillator mode by re-looping to itself with phase inversion. When the filter operates with order less than three, an additional series filter is provided to form the oscillator loop.
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Patent Agency Ranking
公开(公告)号：FR2835667B1
公开(公告)日：2006-08-04
申请号：FR0201516
申请日：2002-02-07
Applicant: ST MICROELECTRONICS SA
Inventor： RAVATIN JEAN , MOURET MICHEL , VAN ZANTEN FRANCOIS
Abstract: The filter is set up by firstly operating in oscillator mode, during which time the oscillator frequency is measured. The characteristics of the filter are adjusted in order to match the required cut-off frequency for the filter, as closely as possible, within a determined degree of tolerance. The filter control procedure includes a phase in which the filtering circuit (FF10) operates as an oscillator, and the frequency of operation of the oscillator is determined. The characteristics of the device are then corrected, taking account of the measured frequency of oscillation and a predetermined relationship between the frequency of oscillation and the theoretical cut-off frequency of the filter. This gives the circuit a cut-off frequency which is equal to the frequency of oscillation, within a close tolerance. After this adjustment phase, the filter moves into a working phase, in which the filter carries out its filtering function. When the filter has an order greater than three, the filter operates in oscillator mode by re-looping to itself with phase inversion. When the filter operates with order less than three, an additional series filter is provided to form the oscillator loop.
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公开(公告)号：FR2854008B1
公开(公告)日：2005-07-15
申请号：FR0304829
申请日：2003-04-17
Applicant: ST MICROELECTRONICS SA
Inventor： VAN ZANTEN FRANCOIS
Abstract: An amplifier circuit comprising an amplification chain having a differential output stage; a common mode correction block acting on the input of the output stage as a function of a common mode voltage at the output of said stage and introducing a phase shift between its input and its output for frequencies close to the cut-off frequency of the circuit; and, in parallel with the correction block, a means introducing no phase shift between its input and its output and having at frequencies greater than or equal to the circuit cut-off frequency an output impedance much smaller than the output impedance of the correction block.
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公开(公告)号：FR2850499A1
公开(公告)日：2004-07-30
申请号：FR0300933
申请日：2003-01-28
Applicant: ST MICROELECTRONICS SA
Inventor： RAVATIN JEAN , VAN ZANTEN FRANCOIS
Abstract: The circuit for correcting the offset of a chain (2) for amplification and low-pass filtering having a predetermined gain (G) and cut-off frequency (Fc) depending on the value of at least one capacitor, comprises a digital-analog converter (18) for the return of a correction signal (delta) dependent on the value of a programmable digital word (COM), a digital automaton (14) for finding and storing one of two consecutive values of the digital word between which the output signal changes sign so that the input signal is annulled during an adjustment phase, and tuning elements (22,24) for reducing the value of at least one capacitor with respect to its normal functioning value. The circuit with a determined cut-off frequency (Fc) dependent on several capacitors comprises means for reducing the value of each capacitance during the tuning phase. The means for reducing the value of at least one capacitance consist of means for switching at least one capacitor with another of lower capacitance, or at least one capacitor is formed of a low-value capacitance connected in parallel with a set of small capacitors each in series with a programmable switch. The method (claimed) for correcting the offset of a chain for amplification and low-pass filtering, comprises the steps of annulling the input signal, returning a correction signal dependent on the value of a digital word and modifying the value until the output signal changes sign, and storing the value of the digital word.
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公开(公告)号：FR2832519A1
公开(公告)日：2003-05-23
申请号：FR0114926
申请日：2001-11-19
Applicant: ST MICROELECTRONICS SA
Inventor： VAN ZANTEN FRANCOIS , SABUT MARC , RIBAS RAYMOND
Abstract: A mirroring circuit operating at high frequencies is provided. The mirroring circuit includes a first branch having a first transistor in series with a first resistor, a second branch having a second transistor in series with a second resistor, and a servo circuit for controlling current flowing in the first branch and the second branch. The servo circuit includes a third transistor configured as a diode, a source of the third transistor coupled to a source of the first transistor, a fourth transistor configured as a shift lever, a source of the fourth transistor coupled to ground via a third resistor, a fifth transistor configured as a diode, a source of the fifth transistor coupled to a source of the second transistor, and a sixth transistor configured as a shift lever, a source of the sixth transistor coupled to ground via the third resistor.
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公开(公告)号：FR2824681A1
公开(公告)日：2002-11-15
申请号：FR0106298
申请日：2001-05-14
Applicant: ST MICROELECTRONICS SA
Inventor： RENOUS CLAUDE , VAN ZANTEN FRANCOIS
Abstract: A wideband differential amplifier includes a first differential stage connected to a Miller stage allowing an open-loop gain increase. The Miller stage includes a current source and a resistive-capacitive network causing a feedback into the current source. The feedback includes a portion of a Miller stage output signal having a high frequency range to move a bias point of the current source within the high frequency range. Thus, a gain of the Miller stage significantly increases towards the bias point.
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