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    TRANSCONDUCTANCE CONTROL CIRCUIT AND ITS METHOD
    1.
    发明专利
    TRANSCONDUCTANCE CONTROL CIRCUIT AND ITS METHOD 失效

    公开(公告)号：JP2000013185A

    公开(公告)日：2000-01-14

    申请号：JP13422999

    申请日：1999-05-14

    Applicant: ST MICROELECTRONICS SRL

    Inventor： DE MICHELI MARCO ,  PORTALURI SALVATORE ,  BOLLATI GIACOMINO ,  BRUCCOLERI MELCHIORRE

    IPC: G05F3/26 ,  H03F3/30 ,  H03H11/04

    Abstract: PROBLEM TO BE SOLVED: To shorten transconductance stable time after a request for changing the interruption frequency of a filter by installing a feedback loop between the output/input of a transconductor connected to DAC so that reference current is set and making reference current which is set by DAC into a mirror image. SOLUTION: In a master section circuit, output current IR from DAC 7, which is set by reference current generated by a current source 8 and digital word FC-WORD, is made into a mirror image by a PMOS transistor 20 which is diode-connected. Current which is made into the mirror image is sent later from a PMOS transistor 21 to an NMOS transistor 22. It is made into the mirror image in an NMOS transistor 23. The drain terminal of the transistor 23 is connected to a node 6 and a capacitor 5 is connected to the node 6. Thus, the transistor 22 sets the current of the transistor 23.

    INTEGRATED CIRCUIT
    2.
    发明专利
    INTEGRATED CIRCUIT 失效

    公开(公告)号：JPH1186459A

    公开(公告)日：1999-03-30

    申请号：JP19573198

    申请日：1998-07-10

    Applicant: ST MICROELECTRONICS SRL

    Inventor： CELANT LUCA ,  DE MICHELI MARCO ,  BRUCCOLERI MELCHIORRE ,  RIGAZIO LUCA

    IPC: G11B20/14 ,  H03B29/00 ,  H03L7/07 ,  H03L7/22

    Abstract: PROBLEM TO BE SOLVED: To prevent locking caused by injection of two oscillators due to stray current in an integrated circuit. SOLUTION: The integrated circuit has two phase lock groups, R-PLL, W-PLL, and each of these phase lock groups has its own oscillators OSC-1, OSC-2. The oscillator OSC-2 of one of these phase lock groups, W-PLL, is coupled with a noise generator N-GEN. And a means TM which operates this noise generator N-GEN is installed so that injected noise randomly changes the frequency of the oscillator OSC-2 of the above one phase lock group when the other phase lock group is in operation.

    3.
    发明专利
    未知

    公开(公告)号：DE69825250D1

    公开(公告)日：2004-09-02

    申请号：DE69825250

    申请日：1998-05-15

    Applicant: ST MICROELECTRONICS SRL

    Inventor： DE MICHELI MARCO ,  PORTALURI SALVATORE ,  BOLLATI GIACOMINO ,  BRUCCOLERI MELCHIORRE

    IPC: G05F3/26 ,  H03F3/30 ,  H03H11/04

    Abstract: A transconductance control circuit, particularly for a continuous-time filter, comprising a transconductor (4) across which a constant voltage is input; the transconductor is connected to a DAC (7) to set a reference current (IR); a feedback loop (9, 10, 23, 11) is provided between the output of the transconductor (4) and its input; the particularity of the circuit is the fact that it further comprises means (20, 22, 24) for mirroring the reference current (IR) set by the DAC (7) which are suitable to mirror the current both to the feedback loop and to at least one cell of a filter which is cascade-connected.

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