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    • 22. 发明申请
    • MULTIPLIER DEVICE
    • 多媒体设备
    • WO2005055414A1
    • 2005-06-16
    • PCT/EP2004/013742
    • 2004-12-01
    • SEMICONDUCTORS IDEAS TO THE MARKET (ITOM) B.V.KASPERKOVITZ, Wolfdietrich, Georg
    • KASPERKOVITZ, Wolfdietrich, Georg
    • H03D1/22
    • H03D1/2209
    • Multiplier device comprising first to n th multipliers M 1 to M n for multiplying a carrier modulated information signal with first to n th mutually phase shifted and identical, substantially square wave mixing signals MS 1 to MS n with 50% duty cycle. In order to eliminate fifth or higher order interferences from the output of said multiplier device according to the invention, n is greater than 2, outputs of said multipliers M 1 to M n are respectively coupled through weighting circuits W 1 to W n with respective fixed weighting factors WF 1 to WF n to an adder circuit, said mixing signals MS 1 to MS n having respective phase angles φ i corresponding to φ i = i * Δφ, said weighting factors WF i corresponding to the sine value of said respective phase angles φ i = i * Δφ with Δφ being the mutual phase difference between each two phase consecutive mixing signals corresponding to π/(n + 1) and i varying from 1 to n.
    • 乘法器装置包括第一至第n乘法器M1至Mn,用于将载波调制信息信号与第一至第n相互相移且相等的具有50%占空比的基本方波混频信号MS1至MSn相乘。 为了从根据本发明的所述乘法器装置的输出消除第五或更高阶干扰,n大于2,所述乘法器M1至Mn的输出分别通过加权电路W1至Wn耦合,各个固定加权系数WF1至 WFn到加法器电路,所述混合信号MS1至MSn具有对应于phi i = i * Deltaphi的各个相位角phii,所述加权因子WFi对应于所述各个相位角phi i = i * Deltaphi的正弦值,其中Deltaphi为 每个两相连续混合信号之间的相位差对应于pi /(n + 1),i从1变化到n。
    • 23. 发明申请
    • PROGRAMMABLE HIGH PRECISION FILTER
    • 可编程高精度滤波器
    • WO2005025060A1
    • 2005-03-17
    • PCT/EP2004/009869
    • 2004-09-05
    • SEMICONDUCTOR IDEAS TO THE MARKET (ITOM) BVKASPERKOVITZ, Wolfdietrich, Georg
    • KASPERKOVITZ, Wolfdietrich, Georg
    • H03H11/04
    • H03H11/0472H03H11/22H03H2011/0494H03H2210/021H03H2210/046
    • Fully programmable high precision filter having a filter input and a filter output including a first, first order low pass filter section comprising first and second mutually identical operational transconductance amplifiers (OTAs), each having a controllable transconductance Gm from a differential voltage input to a single current output, the current outputs of both first and second OTAs being resistorless coupled to a first capacitor, the second OTA being arranged to form a variable positive virtual resistance across said first capacitor, a gain and a bandwidth control signal being respectively supplied to said first and second OTA. To provide an unambiguous control of filter parameters, as well as flexibility in selectivity mode (i.e. bandpass or low pass filter mode) by means of programmable digital or analogue control signals with a performance comparable to programmable digital filters, a second order low pass filter section is being applied, comprising a cascade connection of said first, first order low pass filter section with an identical second, first order low pass filter section comprising a second capacitor, identical to the first capacitor, the first OTA thereof being varied in its transconductance with said gain control signal, the second OTA of both first and second, first order low pass filter sections being varied in their transconductances with said bandwidth control signal, an output terminal of the second, first order low pass filter section being fed back through a feedback OTA to the common connection between the output terminal of the first, first order low pass filter section and an input terminal of the second, first order low pass filter section, said feedback OTA being identical to each of the OTAs of the first and second first order low pass filter sections and being supplied with a feedback control signal through a feedback control signal terminal.
    • 具有滤波器输入和滤波器输出的完全可编程的高精度滤波器,包括第一,第一级低通滤波器部分,其包括第一和第二相互相同的运算跨导放大器(OTA),每个具有从差分电压输入到单个 电流输出,第一和第二OTA的电流输出无阻抗地耦合到第一电容器,第二OTA布置成在所述第一电容器两端形成可变的正虚拟电阻,增益和带宽控制信号分别提供给所述第一电容器 和第二个OTA。 通过具有与可编程数字滤波器相当的性能的可编程数字或模拟控制信号来提供滤波器参数的明确控制以及选择性模式(即带通或低通滤波器模式)的灵活性,二阶低通滤波器部分 包括所述第一,第一级低通滤波器部分与相同的第二低通滤波器部分的级联连接,所述第二低通滤波器部分包括与第一电容器相同的第二电容器,其第一OTA的跨导变化为 所述增益控制信号,第一和第二低通滤波器部分的第二OTA与所述带宽控制信号在它们的跨导中变化,第二,第一级低通滤波器部分的输出端通过反馈反馈 OTA到第一,一阶低通滤波器部分的输出端和输入端之间的公共连接 第二,第一级低通滤波器部分的第一级,所述反馈OTA与第一和第二一级低通滤波器部分的每个OTA相同,并通过反馈控制信号端子被提供反馈控制信号。
    • 26. 发明申请
    • STEREODECODER
    • 立体声解码器
    • WO2003017512A1
    • 2003-02-27
    • PCT/EP2002/008809
    • 2002-08-06
    • SEMICONDUCTOR IDEAS TO THE MARKET (ITOM) B.V.KASPERKOVITZ, Wolfdietrich, Georg
    • KASPERKOVITZ, Wolfdietrich, Georg
    • H04B1/16
    • H03D1/2209H04B1/1646H04H40/63
    • 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.
    • 一种用于解码立体声多路复用信号的装置,包括基带和信号(L + R),在抑制子载波上被幅度调制的差分信号(LR)和具有频率位于 所述和差和差分信号,所述装置具有通过并行立体声和信号路径耦合到立体声多路复用信号的输入,以及差分信号路径中的第一和第二输入的同步解调器,局部正弦子 载波被提供给所述同步解调器的载波输入,用于将所述幅度调制差分信号(LR)同步解调成基带。 为了最大化立体声通道间隔,该装置设置有自动增益控制回路,该自动增益控制回路包括接收参考信号的第一混频器级,其信号输出耦合到第二混频器级,具有载波输入的两个混频器级被提供有所述局部正弦子 载波用于所述参考信号的相应的上下转换,所述第二混频级的信号输出通过6dB衰减器耦合到差分电路,差分电路提供衰减器的输出信号与参考信号之间的差,所述差 电路耦合到增益控制放大装置的控制输入,用于改变所述同步解调器和所述第一和第二混频器级的增益。
    • 29. 发明申请
    • CONTROLLABLE OSCILLATOR
    • 可控振荡器
    • WO2002087069A1
    • 2002-10-31
    • PCT/EP2002/004174
    • 2002-04-12
    • SEMICONDUCTOR IDEAS TO THE MARKET (ITOM) B.V.KASPERKOVITZ, Wolfdietrich, Georg
    • KASPERKOVITZ, Wolfdietrich, Georg
    • H03B5/20
    • H03B5/20
    • 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.
    • 可控振荡器电路包括再生回路,其包括第一和第二部分的级联电路,每个级联电路具有可调增益和在振荡频率下为90°的相移,第一和第二部分分别包括第一和第二跨导放大器,输出 其耦合到第三和第四跨导放大器,其从输出端被正反馈回到输入端,并且经由第一和第二电容器到第二和第一增益控制放大器的输入端,所述第一和第二电容器并联耦合到 第一和第二负载电阻器,调谐控制电流被提供给第一和第二跨导放大器的控制输入,第一和第二跨导放大器中的至少一个的输出耦合到提供增益控制电流的幅度检测装置 用于自动增益控制来控制输入 第三和第四跨导放大器,所述第一部分的所述第一和第三跨导放大器具有共同的第一和第二输出端的差分对,所述第二部分的所述第二和第四跨导放大器具有第三和第四输出端的差分对, 共同。 为了提供能够产生正弦信号并且可以在较低调谐频率下调谐并且以比上述常规振荡器电路更低的电源电压工作的振荡器,所述第一和第二并联RC滤波器耦合在第一和第二输出端子之间,第三和第二输出端子 所述第一至第四输出端分别耦合到第一至第四直流电流通路,将至少大部分所述调谐和增益控制电流分流至电源电压。