Communication Device with compensation of transmitter leakage signals occuring at a receiver input
    41.
    发明授权
    Communication Device with compensation of transmitter leakage signals occuring at a receiver input 有权
    与在接收器发射器泄漏信号中发生的补偿通信设备

    公开(公告)号:EP1183786B1

    公开(公告)日:2006-11-22

    申请号:EP00938719.2

    申请日:2000-05-29

    IPC分类号: H04B1/52 H04B1/12

    CPC分类号: H04B1/525 H04B1/123

    摘要: Communication device comprising a transmitter and a receiver, coupled to antenna means respectively via a transmitter output and a receiver input. For an effective and reliable reduction of transmitter leakage signals occurring at the receiver input corrective signal means are being used, comprising transmitter leakage signal selective amplifying means for selectively amplifying said transmitter leakage signal provided with a transmitter signal reference input being coupled to the transmitter output, a transmitter leakage signal input being coupled to the receiver input and a transmitter leakage signal output being coupled to said transmitter leakage signal input for a negative feed back of said transmitter leakage signals.

    MIRROR SUPPRESSION CIRCUIT IN A QUADRATURE DEMODULATOR
    42.
    发明公开
    MIRROR SUPPRESSION CIRCUIT IN A QUADRATURE DEMODULATOR 有权
    明镜抑制电路在正交解调器

    公开(公告)号:EP1504524A2

    公开(公告)日:2005-02-09

    申请号:EP03735371.1

    申请日:2003-05-01

    IPC分类号: H03D3/00

    CPC分类号: H03D3/009

    摘要: Mirror suppression circuit and receiver using such mirror suppression circuit comprising a first quadrature signal path coupled between quadrature signal input and output terminals and including an error correction circuit for correction of amplitude and phase errors in a carrier modulated quadrature signal comprising a pair of in-phase and phase quadrature signal components. To obtain a suppression of both amplitude and phase imbalance of said carrier modulated quadrature signal as well as signal amplitude variations, a quadrature output of said error correction circuit being coupled through a first filter circuit for a selection of said quadrature signal to a first quadrature input of an error detection circuit, said first quadrature signal path being coupled prior to said first filter circuit through a second quadrature signal path to a second quadrature input of said error detection circuit, said error detection circuit detecting amplitude and phase errors and providing amplitude and phase control signals to amplitude and phase control inputs of said error correction circuit for a negative feed back of said amplitude and phase errors to said error correction circuit, said amplitude control signal varying with at least one of products Iw*Iref and Qw*Qref and said phase control signal varying with at least one of products Iw*Qref and Qw*Iref, Iw and Qw, respectively Iref and Qref, representing the in-phase and phase quadrature signal components of said quadrature signal at the first quadrature input of the error detection circuit, respectively the in-phase and phase quadrature signal components of a quadrature reference signal occurring at the negative carrier frequency of said quadrature signal at the second quadrature input of the error detection circuit.

    STEREODECODER
    43.
    发明公开
    STEREODECODER 有权
    立体声解码器

    公开(公告)号:EP1417771A1

    公开(公告)日:2004-05-12

    申请号:EP02794757.1

    申请日:2002-08-06

    IPC分类号: H04B1/16 H03D1/22 H04H5/00

    摘要: An arrangement for decoding a stereo multiplex signal, comprising a baseband sum signal (L+R), a difference signal (L-R) which is amplitude-modulated on a suppressed sub-carrier and a pilot signal having a frequency located between the frequency bands of said sum and difference signals, said arrangement having an input for the stereo multiplex signal coupled through parallel stereo sum and difference signal paths to first and second inputs of a dematrix circuit, a synchronous demodulator being included in the difference signal path, a local sinusoidal sub-carrier being supplied to a carrier input of said synchronous demodulator for a synchronous demodulation of said amplitude-modulated difference signal (L-R) into baseband. To maximize stereo channel separation the arrangement is provided with an automatic gain control loop comprising a first mixer stage receiving a reference signal, a signal output thereof being coupled to a second mixer stage, both mixer stages having carrier inputs being supplied with said local sinusoidal sub-carrier for a respective up and down conversion of said reference signal, a signal output of said second mixer stage being coupled through a 6 dB attenuator to a difference circuit providing the difference between the output signal of the attenuator and the reference signal, said difference circuit being coupled to a control input of gain controlled amplifying means for varying the gain of said synchronous demodulator and said first and second mixer stages.

    CONTROLLABLE OSCILLATOR
    44.
    发明公开
    CONTROLLABLE OSCILLATOR 有权
    应税OSC

    公开(公告)号:EP1380099A1

    公开(公告)日:2004-01-14

    申请号:EP02732619.8

    申请日:2002-04-12

    IPC分类号: H03B5/20

    CPC分类号: H03B5/20

    摘要: Controllable oscillator circuit comprising a regenerative loop which incorporates a cascade circuit of first and second sections each having a controllable gain and a phase shift which is 90° at the oscillation frequency, the first and second sections comprising first and second transconductance amplifiers, respectively, outputs of which are coupled to third and fourth transconductance amplifiers, which are positively fed back from the output to the input, and via first and second capacitors to inputs of the second and first gain controlled amplifiers, said first and second capacitors being coupled in parallel to first and second load resistors, respectively, a tuning control current being supplied to control inputs of the first and second transconductance amplifiers, the output of at least one of the first and second transconductance amplifiers being coupled to an amplitude detection arrangement providing a gain control current for an automatic gain control to control inputs of the third and fourth transconductance amplifiers, said first and third transconductance amplifiers of the first section having a differential pair of first and second output terminals in common, said second and fourth transconductance amplifiers of the second section having a differential pair of third and fourth output terminals in common. In order to provide an oscillator capable of generating sinusoidal signals and tuneable at lower tuning frequencies and operating at lower supply voltages than the above conventional oscillator circuit, said first and second parallel RC filters are coupled between the first and second output terminals and the third and fourth output terminals, respectively, said first to fourth output terminals being respectively coupled to first to fourth DC current paths shunting at least a substantial part of said tuning and gain control currents to a supply voltage.

    Integrated RC Filter
    45.
    发明公开
    Integrated RC Filter 审中-公开
    Integrierter RC滤波器

    公开(公告)号:EP1289137A1

    公开(公告)日:2003-03-05

    申请号:EP01203003.7

    申请日:2001-08-06

    IPC分类号: H03H11/04 H03H11/12

    CPC分类号: H03H11/0422 H03H11/1213

    摘要: Integrated RC filter comprising a first resistor being coupled to a first capacitor through a first node, a signal input of said integrated RC filter being coupled through one ofthe first resistor and the first capacitor to the first node. To allow for an increase in the RC timeconstant τ of the RC filter without losing signal transparency, amplification means are included between said signal input and said one of the first resistor and the first capacitor having a gain factor substantially larger than unity, said first node being coupled through attenuation means to a signal output, said attenuation means having an attenuation factor substantially corresponding to said gain factor.

    摘要翻译: 集成RC滤波器,包括通过第一节点耦合到第一电容器的第一电阻器,所述集成RC滤波器的信号输入通过第一电阻器和第一电容器之一耦合到第一节点。 为了允许RC滤波器的RC时间延迟τ增加而不失去信号透明度,放大装置包括在所述信号输入端和所述第一电阻器和所述第一电容器中的所述第一电阻器之间,其增益因子基本上大于单位,所述第一节点 通过衰减装置耦合到信号输出端,所述衰减装置具有基本对应于所述增益因子的衰减因子。

    Feedback loop with slew rate limiter
    46.
    发明公开
    Feedback loop with slew rate limiter 审中-公开
    安东尼·辛格

    公开(公告)号:EP1229653A1

    公开(公告)日:2002-08-07

    申请号:EP01200401.6

    申请日:2001-02-02

    IPC分类号: H03L7/00

    CPC分类号: H03G3/3036 H03L7/093

    摘要: In order to improve the performance of a feed back comprising a loop filter in terms of loop selectivity, stability and robustness the loop filter is being provided with a slew rate limiter.

    摘要翻译: 为了在环路选择性,稳定性和鲁棒性方面提高包括环路滤波器的反馈的性能,环路滤波器被提供有转换速率限制器。

    A receiver with AGC controlled resonant amplifier
    47.
    发明公开
    A receiver with AGC controlled resonant amplifier 审中-公开
    EinEmpfängermit einemResonanzverstärkermit automatischerVerstärkungsregelung

    公开(公告)号:EP1229643A1

    公开(公告)日:2002-08-07

    申请号:EP01200399.2

    申请日:2001-02-02

    IPC分类号: H03G3/30 H03J3/08

    CPC分类号: H03J3/08 H03G3/3052

    摘要: Receiver comprising a resonance amplifier for selectively amplifying a modulated carrier signal being coupled to signal demodulation means for narrow band demodulation of said carrier signal providing an RF carrier level indicative, first DC signal (A) being supplied to a first input of AGC signal generating means, said resonance amplifier having a cascade of first and second transconductance amplifiers (TC1, TC2) being included in a loop, outputs thereof being coupled via first and second parallel RC filters (R1C1; R2C2) to inputs of the second and first transconductance amplifiers TC1, TC2), respectively, said loop also including means for signal inversion (INV), inputs and outputs of third and fourth transconductance amplifiers (TC3, TC4) being coupled to outputs of said first and second transconductance amplifiers (TC1, TC2), respectively, to effectuate a negative resistance value across said first and second parallel RC filters (R1C1, R2C2), respectively, varying with the gain of said third and fourth transconductance amplifiers (TC3, TC4), fifth and sixth transconductance amplifiers (TC5, TC6) being coupled between inputs and outputs of said resonance amplifier. In order to reduce the overall noise figure of the receiver while allowing optmization in terms of dynamic range and dynamic selectivity, said AGC signal generating means derive first and second control signals (Iq, Id) from said first DC signal (A), said first control signal (Iq) being supplied to gain control inputs of said third and fourth transconductance amplifiers (TC3, TC4) and said second control signal (Id) being supplied to gain control inputs of said fifth and sixth transconductance amplifiers (TC5, TC6), the first and second control signals (Iq, Id) increasing at an increase of the first DC signal (A) and vice versa, the first control signal (Iq) stronger than the second control signal (Id).

    摘要翻译: 接收机包括用于选择性地放大已调制载波信号的谐振放大器,所述调制载波信号被耦合到信号解调装置,用于所述载波信号的窄带解调,提供RF载波电平指示的第一DC信号(A)被提供给AGC信号产生装置 ,所述谐振放大器具有级联的第一和第二跨导放大器(TC1,TC2)被包括在一个环路中,其输出端经由第一和第二并联RC滤波器(R1C1; R2C2)耦合到第二和第一跨导放大器TC1的输入端 ,TC2),所述环路还包括用于信号反相(INV)的装置,分别耦合到所述第一和第二跨导放大器(TC1,TC2)的输出的第三和第四跨导放大器(TC3,TC4)的输入和输出 以分别跨越所述第一和第二并联RC滤波器(R1C1,R2C2)实现负电阻值,其随着 所述第三和第四跨导放大器(TC3,TC4),第五和第六跨导放大器(TC5,TC6)耦合在所述谐振放大器的输入和输出之间。 为了减少接收机的总噪声系数,同时允许在动态范围和动态选择性方面进行优化,所述AGC信号产生装置从所述第一直流信号(A)导出第一和第二控制信号(Iq,Id),所述第一 提供控制信号(Iq)以增益所述第三和第四跨导放大器(TC3,TC4)的控制输入和所述第二控制信号(Id)被提供给所述第五和第六跨导放大器(TC5,TC6)的增益控制输入, 第一和第二控制信号(Iq,Id)在第一DC信号(A)增加时增加,反之亦然,第一控制信号(Iq)比第二控制信号(Id)更强。

    COMMUNICATION DEVICE
    48.
    发明公开
    COMMUNICATION DEVICE 有权
    与在接收器发射器泄漏信号中发生的补偿通信设备

    公开(公告)号:EP1183786A1

    公开(公告)日:2002-03-06

    申请号:EP00938719.2

    申请日:2000-05-29

    IPC分类号: H04B1/52 H04B1/12

    CPC分类号: H04B1/525 H04B1/123

    摘要: Communication device comprising a transmitter and a receiver, coupled to antenna means respectively via a transmitter output and a receiver input. For an effective and reliable reduction of transmitter leakage signals occurring at the receiver input corrective signal means are being used, comprising transmitter leakage signal selective amplifying means for selectively amplifying said transmitter leakage signal provided with a transmitter signal reference input being coupled to the transmitter output, a transmitter leakage signal input being coupled to the receiver input and a transmitter leakage signal output being coupled to said transmitter leakage signal input for a negative feed back of said transmitter leakage signals.