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1. 发明授权

US5502413A Switchable constant gain summing circuit 失效
标题翻译：可切换常数增益求和电路
公开(公告)号：US5502413A
公开(公告)日：1996-03-26
申请号：US188984
申请日：1994-01-31
申请人： Gary L. Stuhlmiller
发明人： Gary L. Stuhlmiller
IPC分类号： G06G7/14 , G11B20/10 , H03F3/72 , G06G7/42
CPC分类号： H03F3/72 , G06G7/14 , G11B20/10009
摘要： A switchable constant gain summer circuit (10) has been provided. The summer circuit selectively amplifies a plurality of input signals while maintaining a constant dc current flowing through a load which maintains a constant gain for the summer circuit. The summer circuit includes a plurality of amplifier circuits (12, 16) being respectively responsive to a plurality of input signals wherein each one of amplifier circuits has a control input and common first and second outputs for respectively providing first and second output signals. A plurality of control means (14, 18) responsive to a plurality of control signals is included for alternately providing first and second voltages to each one of the control inputs of the amplifier circuits. A load circuit (20) is coupled to the common first and second outputs of the amplifier circuits wherein a DC bias through the load circuit is substantially constant. Also, an output stage (22) coupled to the common first and second outputs of the plurality of amplifier circuits is included for respectively providing first and second summed voltages.
摘要翻译：提供了可切换的恒定增益加法电路（10）。夏季电路选择性地放大多个输入信号，同时保持恒定的直流电流流过负载，其保持夏季电路的恒定增益。夏季电路包括分别响应于多个输入信号的多个放大器电路（12,16），其中放大器电路中的每一个具有控制输入和用于分别提供第一和第二输出信号的公共第一和第二输出。包括响应于多个控制信号的多个控制装置（14,18），以交替地向放大器电路的每个控制输入提供第一和第二电压。负载电路（20）耦合到放大器电路的公共第一和第二输出，其中通过负载电路的直流偏压基本上是恒定的。此外，包括耦合到多个放大器电路的公共第一和第二输出的输出级（22），用于分别提供第一和第二相加的电压。

2. 发明授权

US4567384A Voltage offset producing circuit for use with a line receiver or the like 失效
标题翻译：用于线路接收机等的电压偏移产生电路
公开(公告)号：US4567384A
公开(公告)日：1986-01-28
申请号：US453387
申请日：1982-12-27
申请人： Gary L. Stuhlmiller
发明人： Gary L. Stuhlmiller
IPC分类号： H04L25/02 , H03K5/02 , H03K19/018 , H03K19/007 , H03K19/092
CPC分类号： H03K19/01831 , H03K5/02
摘要： A circuit which may be utilized with a EIA RS 422/423 line receiver to guarantee that the output of the receiver goes to a known output logic stage when there is no signal supplied at the input thereof. The circuit comprises a pair of substantially indentical transistor circuits coupled in parallel between a power supply bus. One transistor of a particular one of the transistor circuits is fabricated with a smaller emitter area with respect to its counterpart transistor in the other transistor circuit. Thus, a voltage difference is established between the emitter contacts of the two transistors which produces the voltage offset. This voltage offset is utilized to dirve the output of the line receiver to said output state absence an input signal supplied to the receiver.
摘要翻译：可以与EIA RS 422/423线路接收机一起使用的电路，以确保当在其输入处没有提供信号时，接收机的输出到达已知的输出逻辑级。该电路包括在电源总线之间并联耦合的一对基本上不连续的晶体管电路。晶体管电路中的一个晶体管的一个晶体管相对于另一个晶体管电路中的对应晶体管具有较小的发射极面积。因此，在产生电压偏移的两个晶体管的发射极触点之间建立电压差。该电压偏移用于将线路接收机的输出推到所述输出状态，而不存在提供给接收机的输入信号。

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