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1.发明授权Drive circuit for a magnetic cassette reader with auto reverse and mute functions 失效具有自动反转和静音功能的磁带阅读器的驱动电路
公开(公告)号：US5506734A
公开(公告)日：1996-04-09
申请号：US99611
申请日：1993-07-30
申请人： Marco M. Monti , Andrea Onetti , Domenico Rossi
发明人： Marco M. Monti , Andrea Onetti , Domenico Rossi
CPC分类号： G11B15/026 , G11B15/125 , G11B15/18
摘要： A drive circuit having two electronic switches formed from N-MOS transistors is designed to alternatively connect the input of a preamplifier stage to a first or second read sensor on the read head of a magnetic tape. The drive circuit also has a third electronic switch formed from an N-MOS transistor which grounds the input of the preamplifier stage. Based on logic input signals, a control circuit switches the first and second switches, or closes the third switch and simultaneously opens the first and second switches.
摘要翻译： 具有由N-MOS晶体管形成的两个电子开关的驱动电路设计成将前置放大器级的输入交替地连接到磁带的读取磁头上的第一或第二读取传感器。 驱动电路还具有由N-MOS晶体管形成的第三个电子开关，其将前置放大器级的输入接地。 基于逻辑输入信号，控制电路切换第一和第二开关，或者关闭第三开关并同时打开第一和第二开关。
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2.发明授权Circuit for suppressing the noise produced by switching between two voltage sources 失效用于抑制由两个电压源之间切换产生的噪声的电路
公开(公告)号：US5241226A
公开(公告)日：1993-08-31
申请号：US805494
申请日：1991-12-11
申请人： Domenico Rossi , Andrea Onetti , Marco M. Monti
发明人： Domenico Rossi , Andrea Onetti , Marco M. Monti
摘要： A circuit for suppressing the noise produced by the switching of two voltage sources having a direct current offset and connected alternately to the input of an amplification stage. The circuit comprises a low-pass filter between the two voltage sources and the amplification stage, which filter is normally disabled during normal operation of the amplification stage, and is only enabled during switching of the two voltage sources, so as to enable a gradual change in the direct voltage supplied to the input of the amplification stage and due to the offset between the two sources.
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3.发明授权Analog integrated circuit having intrinsic topologies and characteristics selectable by a digital control 失效具有可由数字控制选择的固有拓扑和特性的模拟集成电路
公开(公告)号：US4875020A
公开(公告)日：1989-10-17
申请号：US287299
申请日：1988-12-21
CPC分类号： G06J1/00
摘要： An integrated analog circuit having a circuit topology and intrinsic characteristics which may be selected by digital control means is formed by batteries of similar circuit components arranged substantially in parallel or in a matrix array, anyone of which may be isolated or not by means of a dedicated integrated switch and by alternative interconnection paths among the different circuit components and/or batteries of circuit components, which may be also be selected by closing a relative integrated switch. A dedicated nonvolatile memory, integrated on the same chip may be permanently programmed and determine a certain configuration of all the integrated switches thus selected a particlar component or more components of each of said batteries of functionally similar components, and/or selecting a certain interconnection path among the different circuit components in order to form a functional integrated circuit having the desired topology and intrinsic characteristics. The integrated nonvolatile memory is programmed by means of a software program which may take as input data the desired values of the different parameters which determine the intrinsic characteristics of the functional analog circuit and the type of functional analog circuit itself.
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