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    2.
    发明专利
    未知

    公开(公告)号：NO20002264D0

    公开(公告)日：2000-04-28

    申请号：NO20002264

    申请日：2000-04-28

    Applicant: ERICSSON TELEFON AB L M

    Inventor： BJOERK CHRISTIAN ,  LANTZ MARTIN ,  GORDENFORS TORBJOERN ,  MARHOLEV BOJKO

    IPC: H03B5/12 ,  H03B1/00 ,  H03B

    Abstract: A monolithic high frequency voltage controlled oscillator trimming circuit includes a plurality of capacitance loops selectively connected between a first and second differential input of a voltage oscillator active network. A plurality of diodes, connected in series with the respective plurality of capacitance loops, selectively connect respective capacitance loops between the first and second differential input when forward biased. In a similar fashion, the plurality of diodes selectively disconnect the respective capacitance loops from the first and second differential input when reverse biased. A controller applies a forward biasing voltage to the diode of the selected capacitance loop to connect the capacitance loop to the active network of the voltage controlled oscillator and applies a reverse biasing voltage to the diode of the selected capacitance loop to disconnect the capacitance loop from the active network. The diodes used in the capacitance loops form a switch operable at high frequencies and are formed from a bipolar complementary metal oxide semiconductor electro-static discharge protection diode.

    5.
    发明专利
    未知

    公开(公告)号：NO20002264L

    公开(公告)日：2000-05-18

    申请号：NO20002264

    申请日：2000-04-28

    Applicant: ERICSSON TELEFON AB L M

    Inventor： BJOERK CHRISTIAN ,  LANTZ MARTIN ,  GORDENFORS TORBJOERN ,  MARHOLEV BOJKO

    IPC: H03B5/12 ,  H03B1/00

    Abstract: A monolithic high frequency voltage controlled oscillator trimming circuit includes a plurality of capacitance loops selectively connected between a first and second differential input of a voltage oscillator active network. A plurality of diodes, connected in series with the respective plurality of capacitance loops, selectively connect respective capacitance loops between the first and second differential input when forward biased. In a similar fashion, the plurality of diodes selectively disconnect the respective capacitance loops from the first and second differential input when reverse biased. A controller applies a forward biasing voltage to the diode of the selected capacitance loop to connect the capacitance loop to the active network of the voltage controlled oscillator and applies a reverse biasing voltage to the diode of the selected capacitance loop to disconnect the capacitance loop from the active network. The diodes used in the capacitance loops form a switch operable at high frequencies and are formed from a bipolar complementary metal oxide semiconductor electro-static discharge protection diode.

    7.
    发明专利
    未知

    公开(公告)号：NO20002277L

    公开(公告)日：2000-06-29

    申请号：NO20002277

    申请日：2000-04-28

    Applicant: ERICSSON TELEFON AB L M

    Inventor： GORDENFORS TORBJOERN ,  BENGTSSON ERIK ,  ENSTROEM HOKAN

    IPC: H03B5/32 ,  H03B5/04 ,  H03B5/36 ,  H03L1/02 ,  H03L5/00

    Abstract: A highly stable single chip crystal controlled oscillator with automatic gain control. An amplitude detector monitors the output of a crystal controlled oscillator amplifier and produces a feedback signal proportional to the output signal of the amplifier to ensure oscillation is induced at startup and that the amplitude of oscillation is limited to a preselected value during operation to conserve power consumption by the amplifier. The capacitor tank circuit connected to the input of the amplifier includes a voltage variable capacitor the voltage across which is initially established at manufacture to tune the oscillation frequency to a preselected value. The voltage across the voltage variable capacitor is also adjusted to compensate for temperature variations in the circuit.

    9.
    发明专利
    未知

    公开(公告)号：NO20002277D0

    公开(公告)日：2000-04-28

    申请号：NO20002277

    申请日：2000-04-28

    Applicant: ERICSSON TELEFON AB L M

    Inventor： GORDENFORS TORBJOERN ,  BENGTSSON ERIK ,  ENSTROEM HOKAN

    IPC: H03B5/32 ,  H03B5/04 ,  H03B5/36 ,  H03L1/02 ,  H03L5/00 ,  H03B

    Abstract: A highly stable single chip crystal controlled oscillator with automatic gain control. An amplitude detector monitors the output of a crystal controlled oscillator amplifier and produces a feedback signal proportional to the output signal of the amplifier to ensure oscillation is induced at startup and that the amplitude of oscillation is limited to a preselected value during operation to conserve power consumption by the amplifier. The capacitor tank circuit connected to the input of the amplifier includes a voltage variable capacitor the voltage across which is initially established at manufacture to tune the oscillation frequency to a preselected value. The voltage across the voltage variable capacitor is also adjusted to compensate for temperature variations in the circuit.

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