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    1.
    发明专利
    未知

    公开(公告)号：FR2814607B1

    公开(公告)日：2003-02-07

    申请号：FR0012221

    申请日：2000-09-26

    Applicant: ST MICROELECTRONICS SA

    Inventor： GRASSET JEAN CHARLES ,  CATHELIN PHILIPPE ,  LENZ KUNO

    IPC: H03D7/14 ,  H03D7/00

    Abstract: A mixer including a stage for inputting a voltage signal to be shifted and a shift and output stage for providing frequency-shifted signals, a biasing network of the output stage including, between a high supply and a biasing node, a constant current source in parallel with an output element of a current mirror, an input element of which receives a bias order from the input stage.

    4.
    发明专利
    未知

    公开(公告)号：FR2798234A1

    公开(公告)日：2001-03-09

    申请号：FR9911089

    申请日：1999-09-03

    Applicant: ST MICROELECTRONICS SA

    Inventor： GRASSET JEAN CHARLES

    IPC: H03D7/14 ,  H03D7/12 ,  H04Q7/32

    Abstract: The device for frequency transposition implements the corresponding method for the reduction of residual of local oscillator signal in the output signal in a structure of differential Gilbert type, and includes biasing transistors (T1, T2) of output stage of differential transconductor block by subordinating the differential of emitter or source currents of transistors to a current (10) of predetermined common mode. The differential subordination is realized by relooping the emitters or sources and the bases or gates of transistors (T1,T2) of output stage, and by setting the current of common mode by the application of a reference voltage to the connected bases or gates of transistors (T3,T4) of input stage of differential amplifier with transconductance. The application of reference voltage to the bases or gates of transistors (T3,T4) is realized by use of a reference current source (SC) and a reference resistance (R3), mutually connected to a current mirror with transistors (T10,T11), where the base or gate of one transistor (T10) is connected to the bases of transistors (T3,T4) of differential amplifier. The transistors (T3,T4) are biased by a current (IE) generated by the reference current source (SC). The device for the frequency transposition comprises a differential transconductor block (BTC) for the conversion of input signal to a current differential having an input stage with transistors (T1,T2) and means for biasing the transistors, and a current switching circuit (BCC) controlled by a local oscillator connected between the output stage of transconductor circuit and the output terminal of the device. The biasing resistors (R1) are connected between the ground and the emitters or sources of transistors (T1,T2) of output stage. In a variant of the device, the transconductor block comprises an input stage with two transistors, an output stage also with two transistors, and an intermediate stage with four transistors; the collectors or drains of transistors (T3,T4) of differential amplifier are connected to the electrodes of transistors of input stage of transconductor block. The means for current generation in common mode comprise a low-pass filter (FL) of resistive-capacitive type, connected between the emitters or sources of transistors (T3,T4) and those of transistors (T1,T2). The voltage source comprises a constant current source (SC), and a reference resistance (R3) connected between the ground and the current mirror. The subordination means also comprise a current mirror with transistors (T5,T6,T7) connected between the reference current source (SC) and the collectors or drains of transistors (T3,T4) of output stage. A celullar mobile telephone comprises a device for frequency transposition of the proposed type.

    ETAGE RADIOFREQUENCE COMMANDABLE A GAIN/ATTENUATION VARIABLE, EN PARTICULIER INCORPORE DANS LA CHAINE DE TRANSMISSION D'UN TELEPHONE MOBILE CELLULAIRE, ET PROCEDE DE COMMANDE CORRESPONDANT
    5.
    发明专利
    ETAGE RADIOFREQUENCE COMMANDABLE A GAIN/ATTENUATION VARIABLE, EN PARTICULIER INCORPORE DANS LA CHAINE DE TRANSMISSION D'UN TELEPHONE MOBILE CELLULAIRE, ET PROCEDE DE COMMANDE CORRESPONDANT 未知

    公开(公告)号：FR2892577A1

    公开(公告)日：2007-04-27

    申请号：FR0510767

    申请日：2005-10-21

    Applicant: ST MICROELECTRONICS SA

    Inventor： CATHELIN PHILIPPE ,  GRASSET JEAN CHARLES

    IPC: H04B1/40 ,  H04Q7/32

    Abstract: L'étage radiofréquence comprend une cellule multiplicatrice analogique (CLM) possédant des moyens d'entrée (E1A, Elb) pour recevoir un courant d'entrée comportant une composante continue et une composante dynamique radiofréquence, une source de courant commandable (SC) pour délivrer un courant de commande continu, des moyens de multiplication en courant (T1A, T1B, T2A, T2B) générant un courant de sortie dont la composante dynamique radiofréquence est égale au produit de la composante dynamique du courant d'entrée par un coefficient multiplicateur dépendant du rapport entre une valeur proportionnelle à celle du courant de commande continu (2*IGAIN) et la valeur de la composante continue (IMIXDC) du courant d'entrée, des moyens de sortie pour délivrer le courant de sortie; et une cellule analogique d'aiguillage de courant (CLA) possédant des moyens d'entrée reliés aux moyens de sortie de la cellule multiplicatrice, une source de tension commandable (ST) pour délivrer une tension de commande et des moyens d'aiguillage (T4A, T5A, T4B, T5B) aptes à aiguiller une partie du courant d'entrée vers des moyens de sortie de la cellule d'aiguillage en fonction de la valeur de la tension de commande.

    Method and device for controlling the functioning of a bipolar transistor in class A in common emitter or common base assembly
    7.
    发明专利
    Method and device for controlling the functioning of a bipolar transistor in class A in common emitter or common base assembly 未知

    公开(公告)号：FR2837999A1

    公开(公告)日：2003-10-03

    申请号：FR0203806

    申请日：2002-03-27

    Applicant: ST MICROELECTRONICS SA

    Inventor： CATHELIN PHILIPPE ,  GRASSET JEAN CHARLES

    IPC: H03F1/30 ,  H03F1/32 ,  H03K17/14 ,  H04Q7/32

    Abstract: The method subjects the product of static collector current (1c) and the emitter resistance (RE) to a predetermined reference voltage (Vref) whose value is equal, within a tolerance, to 13 mV at the temperature of 27 degrees C. The reference voltage is delivered by a generator (GT) of type proportional to the absolute temperature. It is observed that this reference voltage allows for an extremely large value of point of interception of order 3 (IIP3) and provides very good linearity. The electronic device implementing the method comprises an input receiving a signal (+Vin), a coupling capacitor (C), a bipolar transistor (BIP) functioning in class A, the emitter resistor (RE), the reference voltage generator (GT), and an enslave loop (MAS) connected between the emitter and the base of the bipolar transistor for subjecting the product of the collector current and the emitter resistance to the reference voltage. The output impedance of the enslave loop (MAS) is high with respect to the impedance viewed from the base of the transistor, for example 100 times higher. The gain of the enslave loop (MAS) at the frequency of useful signal and at the frequency difference (delta)f between two tones in an intermodulation test is small compared to unity, for example equal to 1/100. The enslave loop (MAS) comprises a differential amplifier, that is a comparator (CMP) whose first input is connected to the emitter of the transistor, the second input to the reference voltage generator, and whose output is connected to the gate of a MOS transistor (T). The MOS transistor (T) is connected between the supply voltage (Vdd) and the base of the bipolar transistor. The device is implemented in the form of an integrated circuit. A distant terminal in a wireless communication system, in particular mobile telephone, incorporates the radio-frequency reception stage comprising the device as claimed.

    8.
    发明专利
    未知

    公开(公告)号：FR2813148B1

    公开(公告)日：2003-08-15

    申请号：FR0010765

    申请日：2000-08-21

    Applicant: ST MICROELECTRONICS SA

    Inventor： GRASSET JEAN CHARLES ,  PINATEL CHRISTOPHE

    IPC: H03D7/14 ,  H03F1/34 ,  H03F3/191 ,  H03F3/45 ,  H03F3/04

    Abstract: An amplifier including an input circuit tuned to the frequency to be amplified and receiving as an input the signal to be amplified, a first transistor connected in common base, the emitter of which is coupled to the input circuit and the collector of which provides the output signal of the amplifier, and a feedback circuit feeding back to the base of the transistor a fraction of the output voltage. The feedback circuit includes a capacitive bridge and a second transistor. The input circuit can be used in a first stage of the amplifier or of a mixer.

    10.
    发明专利
    未知

    公开(公告)号：FR2867632A1

    公开(公告)日：2005-09-16

    申请号：FR0402596

    申请日：2004-03-12

    Applicant: ST MICROELECTRONICS SA

    Inventor： POUSSET FABIEN ,  GRASSET JEAN CHARLES ,  CATHELIN PHILIPPE

    IPC: H03F1/06 ,  H03F1/32 ,  H03F3/19 ,  H03F3/24 ,  H03K5/01 ,  H04B7/00

    Abstract: The circuit has two inputs receiving respective signal components of a RF differential signal. The respective inputs are connected to an emitter and a base of a bipolar transistor (31) such that a collector of the transistor generates in the output, a current proportional to the difference of the components. The transistor is biased in order to discharge an emitter current sufficient for permitting linear conversion of the signal. An independent claim is also included for a RF signal transmission circuit comprising a differential to non differential signal conversion circuit in a communication system.

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