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公开(公告)号：FR2834088B1
公开(公告)日：2004-03-19
申请号：FR0116600
申请日：2001-12-20
Applicant: ST MICROELECTRONICS SA
Inventor： GRASSET JEAN CHARLES , BOSSU ERIC
Abstract: The polarization device has feedback control (SCOMP, ICOMP) of transconductance, so the time average of input potential of the amplifier transistor (Q1) tracks a reference potential corresponding to desired transistor quiescent current. Seen from the input of the transistor, the impedance (R1,ICTRL) of the surrounding circuit is low at low frequencies and high at radio frequencies.
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公开(公告)号：FR2844066A1
公开(公告)日：2004-03-05
申请号：FR0210647
申请日：2002-08-28
Applicant: ST MICROELECTRONICS SA
Inventor： PELLAT BRUNO , GELLIDA SYLVIE , GRASSET JEAN CHARLES , RIVOIRARD FREDERIC
Abstract: The frequency converter has a transconductance module receiving the input signal and a current switching module connected to the output. The common mode static currents (Iif1, Iif2) in the output are regulated in a closed loop in response to a current proportional to a reference current (Iref) independent of the static currents at the output of the transconductance module.
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公开(公告)号：FR2814607A1
公开(公告)日：2002-03-29
申请号：FR0012221
申请日：2000-09-26
Applicant: ST MICROELECTRONICS SA
Inventor： GRASSET JEAN CHARLES , CATHELIN PHILIPPE , LENZ KUNO
Abstract: The mixer comprises an input intermediate-frequency (IF) stage (10), and a stage for the frequency shifting and output (20) delivering the radio-frequency differential-output signals (RFN,RFP). The biasing network (35) of the output stage comprises a constant current source (10) connected in parallel with a transistor (P3) of a current-mirror (M), whose other transistor (P2) is connected to a transisstor (P1) of a current source (11) of the input stage, and a resistor (R0) connected in series with two diodes (D1,D2) between the biasing node (14) and the ground. The transistors (P1,P2,P3) are of p-MOS type. The input stage (10) is with variable stationary-state current. The constant current source (10) is of bandgap type to ensure a constant voltage on the resistor (R0). The supply voltage (Vdd) is relatively low, e.g. 2.7 V. The input stage (10) comprises, as in prior device, a bipolar transistor (T1), a resistor (RE) connected between the emitter and the ground, a capacitor (CF) for the input of intermediate-frequency signal (IF), a current source (11) with a transistor (P1), a comparator (12), and a variable-voltage source (13). The collector of transistor (T1) delivers the intermediate-frequency signal (IF') with adjusted stationary-state level to the output stage. The output stage comprises a differential pair of bipolar transistors (TN,TP), capacitors (CN,CP) for the input of local-oscillator signals (LON,LOP) phase-shifted by 180 deg. and resistors (RN,RP) connecting the bases of transistors to the biasing node.
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公开(公告)号：FR2798234B1
公开(公告)日：2001-11-23
申请号：FR9911089
申请日：1999-09-03
Applicant: ST MICROELECTRONICS SA
Inventor： GRASSET JEAN CHARLES
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.
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公开(公告)号：FR2798235A1
公开(公告)日：2001-03-09
申请号：FR9911088
申请日：1999-09-03
Applicant: ST MICROELECTRONICS SA
Inventor： GRASSET JEAN CHARLES , PINATEL CHRISTOPHE
Abstract: The amplifier comprises two long-tailed pairs (T1- T2, T3-T4) which function both as transconductance stages and as current path diverting elements. The collectors of one transistor in each pair (T2, T3) are connected to each other and to the supply line (Vcc). The bases of these transistors are also connected together, as are those of the remaining transistors, a control voltage being applied between the pairs of bases. Differential RF output is taken from the collectors which are not joined together, and a differential RF input is applied between the 'tail' circuits, preferably via a feedback resistor (RE), so that the transistor pairs operate in common-base mode w.r.t. RF amplification. An Independent claim is included for a cellular mobile telephone including an amplifier according to the invention.
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Patent Agency Ranking
公开(公告)号：FR2892577B1
公开(公告)日：2008-01-25
申请号：FR0510767
申请日：2005-10-21
Applicant: ST MICROELECTRONICS SA
Inventor： CATHELIN PHILIPPE , GRASSET JEAN CHARLES
Abstract: The device has a radiofrequency stage (ETV) with a variable gain/attenuation and with an analog multiplication cell (CLM) having a pair of inputs (E1A, E1B) receiving an input current comprising a DC component (IMIXDC) and a dynamic radiofrequency component (iin). The cell has a current source (SC) delivering a DC control current of 2*IGAIN. The cell has a current multiplication unit having transistors (T1A, T1B) connected between the inputs and a supply terminal (Vdd). The cell delivers an output current with a DC component equal to IGAIN and a dynamic radiofrequency component (iout). An independent claim is also included for a method for controlling a radiofrequency stage, with variable gain/attenuation, of an electronic device.
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公开(公告)号：FR2881298B1
公开(公告)日：2007-05-11
申请号：FR0500797
申请日：2005-01-26
Applicant: ST MICROELECTRONICS SA
Inventor： RIVOIRARD FREDERIC , GRASSET JEAN CHARLES
IPC: H04B1/26
Abstract: A radiofrequency amplifier device includes a transconductor stage having an input for receiving a radiofrequency signal, and a cascode stage connected to the output of the transconductor stage. The device also includes an auxiliary radiofrequency amplifier compensation stage connected as a negative-feedback loop between the output of the transconductor stage and the base or the gate of the cascode stage.
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公开(公告)号：FR2864725A1
公开(公告)日：2005-07-01
申请号：FR0315479
申请日：2003-12-29
Applicant: ST MICROELECTRONICS SA
Inventor： GRASSET JEAN CHARLES , BOSSU FREDERIC
Abstract: The cell has an attenuation factor control device including a converting circuit (30) receiving a voltage (Vct) and generating a differential current (Ix). A multiplier circuit (40) and an amplifier (60) generate respective differential currents (Iy, Iz). An error amplifier (50) receives an error of the currents (Iy-Iz) at an input and generates currents (IA, IB) in order to minimize the error.
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公开(公告)号：FR2837999B1
公开(公告)日：2005-05-20
申请号：FR0203806
申请日：2002-03-27
Applicant: ST MICROELECTRONICS SA
Inventor： CATHELIN PHILIPPE , GRASSET JEAN CHARLES
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.
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公开(公告)号：FR2834088A1
公开(公告)日：2003-06-27
申请号：FR0116600
申请日：2001-12-20
Applicant: ST MICROELECTRONICS SA
Inventor： GRASSET JEAN CHARLES , BOSSU ERIC
Abstract: The polarization device has feedback control (SCOMP, ICOMP) of transconductance, so the time average of input potential of the amplifier transistor (Q1) tracks a reference potential corresponding to desired transistor quiescent current. Seen from the input of the transistor, the impedance (R1,ICTRL) of the surrounding circuit is low at low frequencies and high at radio frequencies.
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