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    • 6. 发明授权
    • Frequency conversion
    • 变频
    • US08203375B2
    • 2012-06-19
    • US12889259
    • 2010-09-23
    • Gerben Willem de JongJohannes Hubertus Antonius Brekelmans
    • Gerben Willem de JongJohannes Hubertus Antonius Brekelmans
    • G06F7/44G06G7/16
    • H03D7/1441H03D7/1433H03D7/1458H03D7/1483H03D7/166H03D2200/0043H03D2200/0084
    • A frequency conversion circuit configured to mix a first input signal (RF+,RF−) at a first frequency with a second input signal (LO+,LO−) at a second frequency to provide an output intermediate frequency signal (IFout), the circuit comprising: first and second mixing modules, each mixing module comprising a voltage to current converter configured to receive the first input signal (RF+,RF−) and connected to a Gilbert mixer configured to receive the second input signal (LO+,LO−); an intermediate frequency output circuit having inputs connected to receive an intermediate frequency current signal (IF+,IF−) from outputs of each of the Gilbert mixers and an output configured to provide the output intermediate frequency voltage signal (IFout), wherein the first and second mixing modules comprise transistors which are complementary to each other.
    • 一种频率转换电路,被配置为将第一频率的第一输入信号(RF +,RF-)与第二频率的第二输入信号(LO +,LO-)混频以提供输出中频信号(IFout),所述电路包括 :第一和第二混合模块,每个混合模块包括电压 - 电流转换器,配置成接收第一输入信号(RF +,RF-)并连接到配置成接收第二输入信号(LO +,LO-)的吉尔伯特混频器; 一个中频输出电路,具有输入端,用于接收来自Gilbert混合器每个输出端的中频电流信号(IF +,IF-)和被配置为提供输出中频电压信号(IFout)的输出端,其中第一和第二 混合模块包括彼此互补的晶体管。
    • 7. 发明授权
    • Optical disk system with delay-difference detector without delay lines
    • 具有延迟差检测器的光盘系统,无延迟线
    • US07433292B2
    • 2008-10-07
    • US10523385
    • 2003-07-21
    • Johannes Otto VoormanGerben Willem De JongJohannes Hubertus Antonius Brekelmans
    • Johannes Otto VoormanGerben Willem De JongJohannes Hubertus Antonius Brekelmans
    • G11B7/00
    • G11B7/131G11B7/0901
    • Optical disk systems comprising photo detectors (1) for detecting optical disks comprising amplifiers and slicers (2-5) and delay-difference detectors (6) for detecting delay differences in sliced amplified detection signals are improved by installing delaylineless delay-difference detectors (6) comprising combinatorial-logic circuits (7,8) like inverters, ORs, NORs, ANDs, NANDs and sequential-logic circuits (11-18) like SetResetFlipFlops. Without the prior art delay lines, said delay-difference detectors (6) are of a lower complexity and low costly and can be well integrated. By introducing a first pair of sequential-logic circuits (11,12,15,16) for detecting delay differences between rising edges and a second pair of sequential-logic circuits (13,14,17,18) for detecting delay differences between falling edges, both kinds of edges are being used and the influence of time-jitter is less compared to the situation where just one kind of edge is used. Said delay-difference detector (6) further comprises an analog adder/subtracter (9) for adding/subtracting-logic circuit output signals and low pass filter(s) (10) located before or after said adder/subtracter (9).
    • 包括用于检测光盘的光检测器(1),包括用于检测分片放大检测信号中的延迟差的放大器和限幅器(2-5)和延迟差检测器(6),通过安装延迟无延迟差分检测器 )包括类似反相器的组合逻辑电路(7,8),OR,NOR,AND,NAND和诸如SetResetFlipFlops的顺序逻辑电路(11-18)。 在没有现有技术的延迟线的情况下,所述延迟差检测器(6)具有较低的复杂性并且成本低且可以很好地集成。 通过引入用于检测上升沿之间的延迟差的第一对顺序逻辑电路(11,12,15,16)和用于检测下降沿之间的延迟差的第二对顺序逻辑电路(13,14,17,18) 边缘,正在使用两种边缘,并且与仅使用一种边缘的情况相比,时间抖动的影响较小。 所述延迟差检测器(6)还包括用于加/减逻辑电路输出信号的模拟加法器/减法器(9)和位于所述加法器/减法器(9)之前或之后的低通滤波器(10)。
    • 8. 发明授权
    • Means for limiting an output signal of an amplifier stage
    • US07170847B2
    • 2007-01-30
    • US10531012
    • 2003-09-19
    • Gerben Willem De JongJohannes Hubertus Antonius BrekelmansJozef Reinerus Maria Bergervoet
    • Gerben Willem De JongJohannes Hubertus Antonius BrekelmansJozef Reinerus Maria Bergervoet
    • G11B7/00
    • H03F1/32G11B7/0053G11B7/1263G11B7/13H03F1/3211H03G7/06
    • An electronic circuit is provided which can autonomously handle an input current (Ii) having a relatively wide dynamic range without being overdriven. The electronic circuit comprises an amplifier stage (AMPST) having an input (IP) for receiving the input current (Ii) and an output (OP) for supplying an output current (Io), such that, during operation, the strength of the output current (Io) increases in response to an increasing strength of the input current (Ii) as long as the strength of the input current (Ii) has not exceeded an input reference level. The strength of the output current (Io) is kept approximately constant when the strength of the input current (Ii) has exceeded the input reference level but has not exceeded a further input reference level. The strength of the output current (Io) decreases in response to an increasing strength of the input current (Ii) when the strength of the input current (Ii) has exceeded the further input reference level. The amplifier stage (AMPST) may comprise a current mirror (CM) having an input which forms the input (IP), an output which forms the output (OP), and a common node (cn). The amplifier stage (AMPST) further comprises first control means (FCM) having an input connected to the input (EP), and an output connected to the common node (cn). First control means (FCM) controls a current (I2) to the common node (cn) and a voltage (Vcn) at the common node (cn). The first control means (FCM) comprises limiting means (LMT) for limiting the current (I2) when the value of the input current (Ii) has exceeded the input reference level. Then both the input and the output currents (Ii and Io) are limited. In order to avoid a saturation situation of a current source (Is) which supplies a current (I) to the input (EP), the amplifier stage (AMPST) may comprise second control means (SCM) for supplying a compensation current (ICMP) to the input (IP) when the input signal (Ii) has exceeded the input reference level. The current mirror (CM) comprises first (CP1) and second (CP2) current paths which form the core of the current mirror (CM), as is generally known. The decrease in response to an increasing strength of the input current (Ii) when the strength of the input current (Ii) has exceeded the further input reference level is implemented by a third current path (CP3) which takes away current from the second current path (CP2). Optionally, to avoid that the value of the output current (Io) can become too low, a fourth current path (CP4) may be implemented which applies current to the second current path (CP2). The inventive electronic circuit may be advantageously applied in all electronic systems (like CD-apparatus) which need means to limit a maximum output signal.