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公开(公告)号：US3867685A
公开(公告)日：1975-02-18
申请号：US36583373
申请日：1973-06-01
Applicant: RCA CORP
Inventor： AHMED ADEL ABDEL AZIZ
CPC classification number: G05F3/22 , H03F3/45479
Abstract: A relatively small value of current is obtained in an integrated circuit by separating a larger current into two or more parts. The circuit includes two transistors and at least two strings of the same number of series connected diodes. Currents in a fixed ratio to one another are applied in the forward direction to the two strings of diodes and the voltages thereby obtained are applied to the respective base electrodes of the transistors. The larger current is applied in parallel to the emitter-to-collector paths of the two transistors and that part of this current which passes through the one of the transistors drawing the smaller of the two currents, is the current of interest.
Abstract translation: 通过将较大的电流分离成两个或更多个部分，在集成电路中获得相对较小的电流值。 该电路包括两个晶体管和至少两个相同数量的串联二极管的串。 在两个二极管串之间以正向方向施加彼此固定的电流，并且将由此获得的电压施加到晶体管的各个基极。 较大的电流并联施加到两个晶体管的发射极到集电极路径，并且通过吸引两个电流中较小的晶体管的一个晶体管的该电流的部分是感兴趣的电流。
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公开(公告)号：US3619666A
公开(公告)日：1971-11-09
申请号：US3619666D
申请日：1969-05-16
Applicant: RCA CORP
Inventor： AHMED ADEL ABDEL AZIZ , KNIGHT MARK BERWYN
IPC: H03K3/2893 , H03K3/15
CPC classification number: H03K3/2893
Abstract: A trigger circuit is disclosed of a type which can be constructed using integrated, semiconductor chip technology and which includes a thresholding circuit arranged to fix the triggering voltages thereof, whereby a large number of trigger circuits having uniform triggering voltages from chip-to-chip may be produced.
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公开(公告)号：US3904976A
公开(公告)日：1975-09-09
申请号：US46122974
申请日：1974-04-15
Applicant: RCA CORP
Inventor： AHMED ADEL ABDEL AZIZ
CPC classification number: H03F3/45071 , G05F3/265 , H03F3/347
Abstract: The emitter current supplied from a transistor is maintained proportionally related by a factor k to current withdrawn from a first resistive network. This is done by applying the collector current of the transistor to a second resistive network having a current-versus-voltage characteristic proportionally related by the factor k to that of the first resistive network, comparing the potentials developed across the first and the second resistive networks in a differential amplifier to develop and to amplify an error signal, and then applying the amplified error signal to the base electrode of the transistor so as to degenerate error signal.
Abstract translation: 从晶体管提供的发射极电流与从第一电阻网络提取的电流成比例地保持与因子k相关。 这是通过将晶体管的集电极电流施加到具有与因子k成比例地与第一电阻网络的因子k相关的电流 - 电压特性的第二电阻网络来进行的，比较在第一和第二电阻网络 在差分放大器中产生和放大误差信号，然后将放大的误差信号施加到晶体管的基极，以便使误差信号退化。
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4.发明授权Stabilization of quiescent collector potential of current-mode biased transistors 失效稳态电流模式偏置晶体管的静态集电极电位
公开(公告)号：US3878471A
公开(公告)日：1975-04-15
申请号：US45818674
申请日：1974-04-05
Applicant: RCA CORP
Inventor： AHMED ADEL ABDEL AZIZ
Abstract: Current-mode biasing of the base electrode of a collector-loaded amplifier transistor is accomplished without suffering quiescent collector potential variations caused by variations in its common-emitter forward current gain (hfe). To do this, collector and base currents in the ratio of ffe to 1 are impressed upon the transistor from a current supply, wherein the ratio is determined. The quiescent collector potential of the transistor is then determined by the connections of the collector load and is independent of the collector current of the transistor and its attendant variations due to hfe changes.
Abstract translation: 集电极负载的放大器晶体管的基极的电流模式偏置实现，而不会受到其共发射极正向电流增益（hfe）的变化引起的静态集电极电位变化的影响。 为了做到这一点，从电流供应器将ffe与1的比率的集电极和基极电流施加到晶体管上，其中确定该比率。 晶体管的静态集电极电位然后由集电极负载的连接决定，并且与晶体管的集电极电流及其由于hfe变化引起的伴随变化无关。
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公开(公告)号：US3864641A
公开(公告)日：1975-02-04
申请号：US32063373
申请日：1973-01-02
Applicant: RCA CORP
Inventor： AHMED ADEL ABDEL AZIZ
CPC classification number: H03F1/56 , H03F3/347 , H03F3/45071
Abstract: A high-input-impedance transistor amplifiers, requiring no highresistance resistors, is useful in integrated circuitry. A negative feedback circuit splits a quiescent current into first and second portions in the ratio of the collector and base currents of an amplifier transistor. The first portion is supplied to the collector electrode of the amplifier transistor and the second portion is supplied to the emitter electrode of a complementary transistor and thence from the collector electrode of said complementary transistor to the base electrode of the amplifier transistor. The quiescent collector voltage of the amplifier transistor is stably maintained despite the highimpedance biasing of its base electrode.
Abstract translation: 不需要高电阻电阻的高输入阻抗晶体管放大器在集成电路中非常有用。 负反馈电路以放大器晶体管的集电极和基极电流的比率将静态电流分离成第一和第二部分。 第一部分被提供给放大器晶体管的集电极，第二部分被提供给互补晶体管的发射极，然后从所述互补晶体管的集电极到放大晶体管的基极。 放大晶体管的静态集电极电压稳定地保持，尽管其基极的高阻抗偏置。
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公开(公告)号：US3921013A
公开(公告)日：1975-11-18
申请号：US46360574
申请日：1974-04-24
Applicant: RCA CORP
Inventor： AHMED ADEL ABDEL AZIZ
Abstract: An input current is applied to a ladder network comprising diode-connected-transistor shunt legs and resistive series arms. The network derives from the input current a bias current having an amplitude which is a fraction of the input current and supplies that bias current to the base-emitter junction of an amplifier transistor.
Abstract translation: 将输入电流施加到包括二极管连接的晶体管分流支路和电阻串联臂的梯形网络。 该网络从输入电流导出具有作为输入电流的一部分的幅度的偏置电流，并将该偏置电流提供给放大器晶体管的基极 - 发射极结。
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公开(公告)号：US3902079A
公开(公告)日：1975-08-26
申请号：US43516174
申请日：1974-01-21
Applicant: RCA CORP
Inventor： AHMED ADEL ABDEL AZIZ
CPC classification number: H03K17/602 , H03K17/72
Abstract: Complementary transistors, each connected at its base to an input terminal and the collector of the other and one connected at its emitter to an operating voltage source. The other emitter is connected to ground through a controllable impedance and its value controls the circuit operation. It determines whether a path between one of the input terminals and ground will be open and permit the circuit to latch or will close, and if closed, whether the additional path will cause the circuit to remain latched and limit to a given maximum value the load current or will cause the circuit to unlatch.
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公开(公告)号：US3876955A
公开(公告)日：1975-04-08
申请号：US37947373
申请日：1973-07-16
Applicant: RCA CORP
Inventor： AHMED ADEL ABDEL AZIZ
CPC classification number: H03F3/45071
Abstract: A circuit for establishing the quiescent bias current of a differential amplifier with active collector loads (transistor loads). The collector current of an auxiliary transistor, held at the same base-emitter potential as the active loads, is applied to the input circuit of a current amplifier which supplies from its output circuit the combined emitter currents of the differential amplifier transistors. The base currents of the auxiliary transistor and of the active load transistors are decoupled from the input circuit of the current amplifier so that variations in such currents do not affect the quiescent biasing of the differential amplifier.
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公开(公告)号：US3873853A
公开(公告)日：1975-03-25
申请号：US38717073
申请日：1973-08-09
Applicant: RCA CORP
Inventor： AHMED ADEL ABDEL AZIZ
Abstract: A dead-zone comparator includes first and second voltage comparators used respectively to compare an input signal to a high reference level and to a low reference level, which reference levels can be programmed. A bistable memory element is set by the output signal of one comparator and reset by the output signal of the other. These SET and RESET signals are opposite polarity currents, one of which is more severely constrained in value than the other, and are applied via a common SET-RESET buss to the memory element. When the memory element is in its SET condition, a relaxation oscillator is permitted to deliver output pulses of sufficient magnitude to trigger SCR''s or triacs directly. When the memory element is in its RESET condition, the relaxation oscillator is prevented from furnishing any output pulses.
Abstract translation: 死区比较器包括分别用于将输入信号与高参考电平和低参考电平进行比较的第一和第二电压比较器，该参考电平可被编程。 双稳态存储元件由一个比较器的输出信号设置，并由另一个比较器的输出信号复位。 这些SET和RESET信号是相反的极性电流，其中一个电流的值比另一个更严格地受限制，并且通过公共的SET-RESET总线施加到存储器元件。 当存储器元件处于其SET状态时，允许放大振荡器传送足够大的输出脉冲以直接触发SCR或三端双向可控硅开关元件。 当存储元件处于其复位状态时，张力振荡器被阻止提供任何输出脉冲。
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公开(公告)号：US3868581A
公开(公告)日：1975-02-25
申请号：US38117573
申请日：1973-07-20
Applicant: RCA CORP
Inventor： AHMED ADEL ABDEL AZIZ
Abstract: A first grounded-emitter amplifier transistor is followed in direct coupled cascade by a second grounded-emitter amplifier transistor. The first grounded-emitter transistor has directcoupled collector-to-base negative feedback to regulate its collector current to be proportional to applied input current. The direct-coupled feedback includes means to regulate the collector-to-base potential of said first transistor to be proportional to the logarithm of the applied input current. The collector current of the second transistor is thereby in fixed proportion to the applied input current and independent of the forward current gain of the transistors.
