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    • 4. 发明公开
    • Cross current minimisation
    • Querstromminimierung
    • EP2249476A1
    • 2010-11-10
    • EP09158970.5
    • 2009-04-28
    • ST-Ericsson SA
    • Slavov, Nedialko
    • H03F3/217
    • H03F3/217
    • The present invention relates to a method of optimising cross current in class D amplifiers and simultaneously minimising the harmonic distortion. The method overcomes the problem of using the limited speed voltage comparators often used in cross current preventing circuits. The method is based on introducing of a replica amplifier with a current sensor matched to a main amplifier. The duration of the sensed cross current is compared by a current comparator with a small enough reference current. The comparator output generates a pulse with duration equal to the duration of the cross current event in the replica amplifier. The duration of that pulse is measured and used to generate dead time pulse, blanking amplifier pre-driver inputs.
    • 本发明涉及一种优化D类放大器中的交叉电流并同时最小化谐波失真的方法。 该方法克服了使用通常用于防止交叉电流的电路中的有限速度电压比较器的问题。 该方法基于引入具有与主放大器匹配的电流传感器的复制放大器。 感测交叉电流的持续时间由电流比较器与足够小的参考电流进行比较。 比较器输出产生持续时间等于复制放大器中交叉电流事件持续​​时间的脉冲。 该脉冲的持续时间被测量并用于产生死区脉冲,消隐放大器预驱动器输入。
    • 6. 发明公开
    • Interfacing a switch array
    • Koppeln eines Schaltarrays
    • EP2416587A1
    • 2012-02-08
    • EP10251400.7
    • 2010-08-05
    • ST-Ericsson SA
    • Slavov, Nedialko
    • H04Q3/52H03K17/62H03K17/693H03M11/20
    • G06F13/385H04Q3/521H04Q2213/1302H04Q2213/1304H04Q2213/13213H04Q2213/13305
    • An interface circuit (100) for a switch array (10) having an array of switches (S ij , i=1...4, j=1...3), each closeable to couple a row conductor of a plurality of row conductors (X 1 ...X 4 ) to a column conductor of one or more column conductors (Y 1 ...Y 3 ), comprises a current generator (20) and a current detector (30). The current generator (20) has a plurality of row interface ports (24a...24d) for coupling to different ones of the row conductors (X 1 ...X 4 ) and is arranged to generate a switch array current (I M ) for coupling to the row interface ports (24a...24d), the switch array current (I M ) having a different one of a plurality of different switch array current magnitudes (M1...M4) for different ones of the row interface ports (24a...24d), and generate one or more reference currents (I R1 ...I R5 ) each having a different reference current magnitude (R1...R5). The current detector (30) has one or more column interface ports (32a...32c) for coupling to the one or more column conductors (Y 1 ...Y 3 ) and is arranged to detect the switch array current (I M ) flowing at any one of the one or more column interface ports (32a...32c), and generate a row indication indicative of which of the row conductors (X 1 ...X 4 ) a closed one of the switches (S ij , i=1...4, j=1...3) is coupled to by determining which one of the switch array current magnitudes (M1...M4) the detected switch array current (I M ) has by comparing the detected switch array current (I M ) with the one or more reference currents (I R1 ...I R5 ).
    • 一种用于具有开关阵列(S ij,i = 1 ... 4,j = 1 ... 3)的开关阵列(10)的接口电路(100),每个开关阵列可以耦合多个 一列或多列列导体(Y 1 ... Y 3)的列导体的行导体(X 1 ... X 4)包括电流发生器(20)和电流检测器(30)。 电流发生器(20)具有多个行接口端口(24a ... 24d),用于耦合到不同行的导体(X 1 ... X 4),并且被布置成产生开关阵列电流(IM) 为了耦合到行接口端口(24a ... 24d),开关阵列电流(IM)具有用于不同的行接口端口的多个不同的开关阵列电流幅度(M1 ... M4)中的不同的一个 (24a ... 24d),并产生每个具有不同参考电流幅度(R1 ... R5)的一个或多个参考电流(I R1 ... I R5)。 电流检测器(30)具有用于耦合到一个或多个列导体(Y 1 ... Y 3)的一个或多个列接口端口(32a ... 32c),并被布置成检测开关阵列电流(IM) 在一个或多个列接口端口(32a ... 32c)中的任一个处流动,并且生成指示行导体(X 1 ... X 4)中的哪一个是闭合的开关(S ij ,i = 1 ... 4,j = 1 ... 3)通过确定检测到的开关阵列电流(IM)中的哪一个开关阵列电流大小(M1 ... M4) 开关阵列电流(IM)与一个或多个参考电流(I R1 ... I R5)。