Abstract:
The present invention provides a word length reduction circuit that makes use of the word length reduction error signal to dither the input to the circuit. The circuit comprises an input, for receiving an input signal; a word length reduction block, for receiving a modified input signal having a first number of bits, for generating a first output signal having a second number of bits, the second number of bits being smaller than the first number of bits, and for generating an error signal; a signal processing block, for receiving the error signal as a respective input signal and for generating a second output signal, the signal processing block comprising an unstable feedback loop such that the second output signal is randomized; and a first adder, connected to receive the second output signal and the input signal, in order to generate the modified input signal. The dither thus generated requires significantly less power than conventional methods, e.g. linear feedback shift registers.
Abstract:
Disclosed is a dual mode charge-pump circuit (400) and associated method and apparatuses for providing a plurality of output voltages (V 0Ut+ , V 0Ut- ), using a single flying capacitor (cf), the circuit comprising, a network of switches (410) that is operable in a number of different states and a controller (420) for operating said switches in a sequence of said states so as to generate positive and negative output voltages (V out+ , V out- ) together spanning a voltage approximately equal to the input voltage (+V DD ) and centred on the voltage at the common terminal, in a first mode and positive and negative output voltages each up to substantially said input voltage (+V DD ) in a second mode.
Abstract translation:公开了一种双模式电荷泵电路(400)以及用于使用单个电荷泵电路(400)以及相关联的方法和装置,用于提供多个输出电压(V 0Ut +,V 0Ut - 飞行电容器(cf),所述电路包括可在多个不同状态下操作的开关网络(410)和用于以所述状态的序列操作所述开关的控制器(420),以产生正和负输出 一起跨越大约等于输入电压(+ V DDD)的电压并且以电压为中心的电压(V OUT),V OUT, 在第一模式中,在第二模式中,每个直到基本上所述输入电压(+ V DDD)的正和负输出电压。
Abstract:
A micro-electrical-mechanical device comprises: a transducer arrangement having at least a membrane being mounted with respect to a substrate; and electrical interface means for relating electrical signals to movement of the membrane; in which the transducer arrangement comprises stress alleviating formations which at least partially decouple the membrane from expansion or contraction of the substrate.
Abstract in simplified Chinese:一种放大器电路,包含用以放大一输入信号并输出该放大后信号至外部设备之放大器。一电源供应器供应一供应电压至功率放大器。外部设备之本质或种类(例如线负载或头戴式耳机)借由量测相关于该供应电压之一参数而决定,该参数可以是该供应电压下降或上升至一预定门槛値所花费之时间,或者是该供应电压于一预定时段之该电压降或电压升。这些参数都可表示该供应电压随时间之一变化率,其提供负载本质的指示。处理电路可被提供而用以根据该输入信号校准该供应电压随时间之变化率。
Abstract in simplified Chinese:本发明揭示一种使用单一飞驰电容器来提供复数个输出电压的双模充电泵电路及相关联的方法与设备,该电路包括:一切换器网络(410),其可运作在数个不同状态中;以及一控制器(420),用以在由该等状态所组成的一串行之中来操作该等切换器,以便在第一模式中所产生的正输出电压与负输出电压一起展开的电压约等于该输入电压并且系以该共同终端处的电压为中心,而在第二模式中所产生的正输出电压与负输出电压每一者实质上均会高达该输入电压。
Abstract in simplified Chinese:一种放大器电源关闭设备,用以降低音频电路中的暂态信号,该音频电路包括一参考电压产生电路用以产生一参考电压。该参考电压产生电路包括一电容用以维持该参考电压于一想要的准位。该放大器电源关闭设备包括一放电控制电路用以于电源关闭期间控制该参考电压产生电路。该放电控制电路包括用以控制该电容之放电,其中该开关设备由一脉波信号控制。该脉波信号系一脉宽调制信号(PWM)且其脉波宽度系与将被放电之该参考电压的准位成比例。
Abstract in simplified Chinese:揭示一种电流模式切换式调整器,其至少包括:一个电感器;一个用来控制流经电感器的电流之主要切换器;以及一个用来循环操作该主要切换器以及改变主要切换器之工作周期的回授控制电路,以实质上维持调整器的输出电压在一个期望准位。该回授控制电路进一步包括将斜率补偿加到一个信号的斜率补偿电路,该信号代表在斜率补偿信号与回授输出误差电压比较以前的电感电流。该调整器进一步包括用来控制主要切换器对电流限制参考信号作出反应的电流限制电路,该电流限制电路包括用来调整电流限制参考信号的调整电路,该参考信号对一个以上的前工作周期反应,因此不论该输出电压为何,在电感器中的电流限制为一个値,其在稳态系实质上与工作周期无关。