公开(公告)号：US5378938A

公开(公告)日：1995-01-03

申请号：US18856

申请日：1993-02-05

申请人： Dwight D. Birdsall ,  Lloyd F. Linder ,  Phillip L. Elliott

发明人： Dwight D. Birdsall ,  Lloyd F. Linder ,  Phillip L. Elliott

IPC分类号： G11C27/02 ,  H03K17/66 ,  H03K5/159 ,  H03K17/687

CPC分类号： G11C27/026 ,  H03K17/667

摘要： A transconductance push-pull amplifier (20) generates primary push-pull currents (I1, I2) corresponding to a voltage input signal (VIN). Current mirrors (42,44) generate secondary push-pull currents (I3, I4) corresponding to the primary push-pull currents (I1, I2). For sampling, both the primary and secondary push-pull currents (I1, I2, I3, I4) are applied to charge a capacitor (C3) in a current feed-forward arrangement with high slew rate and fast signal acquisition to produce a voltage output signal (VOUT). The capacitor (C3) is disconnected from the amplifier (20) and current mirrors (42,44) to hold the output signal (VOUT). Switching transistors (Q13, Q15) which are connected between the capacitor (C3) and the current mirrors (42,44) have substantially the same non-linear modulation characteristics as corresponding output transistors (Q7, Q8) in the amplifier (20). The output and switching transistors (Q7, Q8, Q13, Q15) are connected to modulate out-of-phase such that non-linear modulation of the primary push-pull currents (I1, I2) by the output transistors (Q7, Q8) is canceled by non-linear modulation of the secondary push-pull currents (I3, I4) by the switching transistors (Q13, Q15), and the output signal (VOUT) is a highly linear replica of the input signal (VIN).

摘要翻译： 跨导推挽放大器（20）产生对应于电压输入信号（VIN）的初级推挽电流（I1，I2）。 电流镜（42,44）产生对应于初级推挽电流（I1，I2）的次级推挽电流（I3，I4）。 对于采样，施加初级和次级推挽电流（I1，I2，I3，I4），以高压摆率和快速信号采集的电流前馈布置对电容器（C3）充电，以产生电压输出 信号（VOUT）。 电容器（C3）与放大器（20）和电流镜（42,44）断开以保持输出信号（VOUT）。 连接在电容器（C3）和电流镜（42,44）之间的开关晶体管（Q13，Q15）具有与放大器（20）中对应的输出晶体管（Q7，Q8）基本相同的非线性调制特性。 输出和开关晶体管（Q7，Q8，Q13，Q15）被连接以调制异相，使得输出晶体管（Q7，Q8）的主要推挽电流（I1，I2）的非线性调制， 通过开关晶体管（Q13，Q15）的二次推挽电流（I3，I4）的非线性调制来消除，输出信号（VOUT）是输入信号（VIN）的高线性复制品。

公开(公告)号：US5410274A

公开(公告)日：1995-04-25

申请号：US210269

申请日：1994-03-17

申请人： Dwight D. Birdsall ,  Phillip L. Elliott ,  Lloyd F. Linder ,  Kelvin T. Tran ,  Donald G. McMullin

发明人： Dwight D. Birdsall ,  Phillip L. Elliott ,  Lloyd F. Linder ,  Kelvin T. Tran ,  Donald G. McMullin

IPC分类号： H03F3/26 ,  H03F3/30 ,  H03F3/45

CPC分类号： H03F3/3081 ,  H03F3/26 ,  H03F3/3067

摘要： First and second current feedback transconductance amplifiers (102,104) each have a high impedance voltage input, a low impedance current input and a pair of push-pull current outputs. In a single-ended configuration, an input signal is applied to the voltage input of the first transconductance amplifier (102) and the push-pull outputs of the both transconductance amplifiers are connected through a current mirror (136,138) to a node (134) where the current outputs are summed. The node current is integrated by a capacitor (174) to produce a voltage which is amplified by a transimpedance amplifier (190) to produce an output voltage which is fed back to the voltage input of the second transconductance amplifier (104). The current inputs of the transconductance amplifiers (102,104) are interconnected by a resistor (132). The high impedance voltage inputs produce common-mode cancellation of distortion in the transconductance amplifiers (102,104) and low input shot noise. In a differential configuration, differential input signals are applied to the voltage inputs of transconductance amplifiers (260,262), and a separate transimpedance amplifier (292,316) and current mirror (278,280) (302,304) is provided for each transconductance amplifier (260,262). A common-mode feedback circuit (352) controls the common-mode output voltages of the transimpedance amplifiers (292,316) to ground. Switch means (402,404,406,408,410,412) may be added to selectively ground the voltage inputs of the transconductance amplifiers (260,262) and disable their input stages by disconnecting their power supplies (VCC,VEE).

摘要翻译： 第一和第二电流反向跨导放大器（102,104）各自具有高阻抗电压输入，低阻抗电流输入和一对推挽电流输出。 在单端配置中，输入信号被施加到第一跨导放大器（102）的电压输入，并且两个跨导放大器的推挽输出通过电流镜（136,138）连接到节点（134） 其中当前输出相加。 节点电流由电容器（174）积分以产生被跨阻放大器（190）放大的电压，以产生反馈到第二跨导放大器（104）的电压输入端的输出电压。 跨导放大器（102,104）的电流输入通过电阻器（132）互连。 高阻抗电压输入产生跨导放大器（102,104）中的失真的共模消除和低输入散射噪声。 在差分配置中，差分输入信号被施加到跨导放大器（260,262）的电压输入端，并为每个跨导放大器（260,262）提供单独的跨阻抗放大器（292,316）和电流镜（278,308）（302,304）。 共模反馈电路（352）控制跨阻放大器（292,316）的共模输出电压接地。 可以添加开关装置（402,404,406,408,410,412）以有选择地接地跨导放大器（260,262）的电压输入，并且通过断开它们的电源（VCC，VEE）来禁用它们的输入级。

公开(公告)号：US5315231A

公开(公告)日：1994-05-24

申请号：US976760

申请日：1992-11-16

申请人： Lloyd F. Linder ,  Dwight D. Birdsall ,  Kelvin T. Tran

发明人： Lloyd F. Linder ,  Dwight D. Birdsall ,  Kelvin T. Tran

IPC分类号： H03F3/45 ,  H03F1/30 ,  H03F3/26 ,  H03F3/30 ,  G05F3/26

CPC分类号： H03F1/307 ,  H03F3/26

摘要： A bandgap reference voltage source (104) has positive and negative terminals (104a,104b) which are connected through high impedance constant current sources (124c,126c) to positive and negative voltage supplies (+VDD,-VEE) respectively. The effect of variations of the voltage supplies (+VDD, -VEE) on the voltage source (104) is low due to the high impedances of the currents sources (124c,126c), providing a high power supply rejection ratio (PSRR). The reference voltage (VREF) generated by the voltage source (104) is converted into a reference current (IREF) which flows through two equal series resistors (108,110), and also through current mirrors (124,126) which produce positive and negative output currents corresponding thereto. The current sources (124c,126c) for the voltage source (104) are also controlled by the current mirrors (124,126). A servo control amplifier (232) senses the voltage at the junction (234) of the resistors (108,110) and adjusts the voltage at either the positive or negative terminal (104a,104b) of the voltage source (104) to maintain the voltages at the terminals (104a,104b) symmetrical with respect to ground, thereby preventing the voltage source (104) from latching to one of the voltage supplies (+VDD,-VEE) during startup.

摘要翻译： 带隙参考电压源（104）具有分别通过高阻抗恒流源（124c，126c）连接到正和负电压源（+ VDD，-VEE）的正端子和负端子（104a，104b）。 由于电流源（124c，126c）的高阻抗提供高电源抑制比（PSRR），电压源（+ VDD，-VEE）的变化对电压源（104）的影响很小。 由电压源（104）产生的参考电压（VREF）被转换成流过两个相等的串联电阻（108,110）的参考电流（IREF），并且还通过电流镜（124,126）产生正和负的输出电流对应 到此。 用于电压源（104）的电流源（124c，126c）也由电流镜（124,126）控制。 伺服控制放大器（232）感测电阻器（108,110）的结（234）处的电压，并且调节电压源（104）的正或负端子（104a，104b）处的电压，以将电压维持在 端子（104a，104b）相对于地面对称，从而防止电压源（104）在启动期间锁定到电压源（+ VDD，-VEE）之一。

公开(公告)号：US5250911A

公开(公告)日：1993-10-05

申请号：US871861

申请日：1992-04-20

申请人： Lloyd F. Linder ,  Dwight D. Birdsall

发明人： Lloyd F. Linder ,  Dwight D. Birdsall

IPC分类号： H03F1/32 ,  H03F3/30 ,  H03F3/45 ,  H03F3/50 ,  H03F1/14

CPC分类号： H03F1/3211 ,  H03F1/3217 ,  H03F1/3276 ,  H03F3/3081 ,  H03F3/45071 ,  H03F3/45098 ,  H03F3/50 ,  H03F3/505 ,  H03F2203/45578 ,  H03F2203/45611 ,  H03F2203/45612 ,  H03F2203/45641 ,  H03F2203/45721

摘要： A compensating transistor (Q5) is connected in series with the collector of a main transistor (Q3), and a level shifted replica (Vin+V1) of an input signal (Vin) is applied to the base of the compensating transistor (Q5) to maintain a constant voltage difference between the base and collector of the main transistor (Q3) and compensate for base width modulation .DELTA.Vce. A voltage-controlled current source (S1) is responsive to the input signal (Vin) and applies a compensating current .DELTA.Iload which is equal and opposite to the load current variation caused by a change (.DELTA.Vin) in the input voltage (Vin) to the emitter of the main transistor (Q3) to compensate for load current modulation .DELTA.Vbe. Alternatively, the compensating current can be applied to the junction of the base of the main transistor (Q3) and the emitter of pre-distortion transistor (Q4) which has a base connected to receive the input signal (Vin). Another compensating transistor (Q12) applies a current (.DELTA.Ib) which is equal and opposite to a non-linear base current variation to the emitter or collector of the main transistor (Q3) to compensate for current gain modulation .DELTA.Ib. The modulation compensation arrangements are applicable to common-collector, commonbase and common emitter amplifiers in single-ended and differential configurations, and to substantially all bipolar and field-effect transistor technologies.

公开(公告)号：US5483150A

公开(公告)日：1996-01-09

申请号：US17200

申请日：1993-02-05

申请人： Phillip L. Elliott ,  Dwight D. Birdsall ,  Lloyd F. Linder ,  Kelvin T. Tran

发明人： Phillip L. Elliott ,  Dwight D. Birdsall ,  Lloyd F. Linder ,  Kelvin T. Tran

IPC分类号： G05F3/20 ,  H03M1/08 ,  H03M1/74 ,  G05F3/08

CPC分类号： G05F3/205 ,  H03M1/089 ,  H03M1/742

摘要： A bias voltage source (20) produces a variable bias voltage (VBREF) which regulates the bias currents in an array (30) of transistor current switch cells (34,36) in an digital-to-analog converter (DAC). The bias voltage (VBREF) is applied to the bases of the regulating transistors (Q8') in the cells (34,36) to regulate the bias currents in their respective main transistors (Q6',Q7') to values proportional to the main bias current (IBIAS). Each main transistor (Q6,Q6',Q7,Q7') and regulating transistor (Q8,Q8') is provided with a compensating transistor (Q10,Q10')(Q11,-Q11') which sinks the emitter-base current thereof and cancels deviation of the actual current gain from the design current gain. Another compensating transistor (Q9,Q9') is connected to each regulating transistor (Q8,Q8') to cancel the effect of base-emitter voltage variation with temperature.

摘要翻译： 偏置电压源（20）产生调节数模转换器（DAC）中的晶体管电流开关单元（34,36）的阵列（30）中的偏置电流的可变偏置电压（VBREF）。 偏置电压（VBREF）被施加到单元（34,36）中的调节晶体管（Q8'）的基极，以将它们各自的主晶体管（Q6'，Q7'）中的偏置电流调节到与主 偏置电流（IBIAS）。 每个主晶体管（Q6，Q6'，Q7，Q7'）和调节晶体管（Q8，Q8'）设置有一个补偿晶体管（Q10，Q10'）（Q11，-Q11'）， 并取消实际电流增益与设计电流增益的偏差。 另一个补偿晶体管（Q9，Q9'）连接到每个调节晶体管（Q8，Q8'）以消除基极 - 发射极电压随温度变化的影响。

公开(公告)号：US5343163A

公开(公告)日：1994-08-30

申请号：US80269

申请日：1993-06-21

申请人： Lloyd F. Linder ,  Dwight D. Birdsall

发明人： Lloyd F. Linder ,  Dwight D. Birdsall

IPC分类号： H03F1/32 ,  H03F3/30 ,  H03F3/45 ,  H03F3/50

CPC分类号： H03F1/3211 ,  H03F1/3217 ,  H03F1/3276 ,  H03F3/3081 ,  H03F3/45071 ,  H03F3/45098 ,  H03F3/50 ,  H03F3/505 ,  H03F2203/45578 ,  H03F2203/45611 ,  H03F2203/45612 ,  H03F2203/45641 ,  H03F2203/45721

摘要： A compensating transistor (Q5) is connected in series with the collector of a main transistor (Q3), and a level shifted replica (Vin+V1) of an input signal (Vin) is applied to the base of the compensating transistor (Q5) to maintain a constant voltage difference between the base and collector of the main transistor (Q3) and compensate for base width modulation .DELTA.Vce. A voltage-controlled current source (S1) is responsive to the input signal (Vin) and applies a compensating current .DELTA.Iload which is equal and opposite to the load current variation caused by a change (.DELTA.Vin) in the input voltage (Vin) to the emitter of the main transistor (Q3) to compensate for load current modulation .DELTA.Vbe. Alternatively, the compensating current can be applied to the junction of the base of the main transistor (Q3) and the emitter of pre-distortion transistor (Q4) which has a base connected to receive the input signal (Vin). Another compensating transistor (Q12) applies a current (.DELTA.Ib) which is equal and opposite to a non-linear base current variation to the emitter or collector of the main transistor (Q3) to compensate for current gain modulation .DELTA.Ib. The modulation compensation arrangements are applicable to common-collector, common-base and common emitter amplifiers in single-ended and differential configurations, and to substantially all bipolar and field-effect transistor technologies.

摘要翻译： 补偿晶体管（Q5）与主晶体管（Q3）的集电极串联连接，并且输入信号（Vin）的电平偏移副本（Vin + V1）被施加到补偿晶体管（Q5）的基极， 以保持主晶体管（Q3）的基极和集电极之间的恒定电压差并补偿基极宽度调制DELTA Vce。 压控电流源（S1）响应于输入信号（Vin）并且施加与由输入电压（Vin）中的变化（DELTA Vin）引起的负载电流变化相等和相反的补偿电流DELTA Iload， 到主晶体管（Q3）的发射极，以补偿负载电流调制DELTA Vbe。 或者，可以将补偿电流施加到主晶体管（Q3）的基极和预失真晶体管（Q4）的发射极，该基极连接以接收输入信号（Vin）。 另一补偿晶体管（Q12）施加与主晶体管（Q3）的发射极或集电极相当且相反的非线性基极电流变化的电流（DELTA Ib），以补偿电流增益调制DELTA Ib。 调制补偿布置适用于单端和差分配置中的共集电极，公共基极和公共发射极放大器，以及基本上所有的双极和场效应晶体管技术。

公开(公告)号：US5315169A

公开(公告)日：1994-05-24

申请号：US894980

申请日：1992-06-08

申请人： Lloyd F. Linder ,  Benjamin Felder ,  Dwight D. Birdsall

发明人： Lloyd F. Linder ,  Benjamin Felder ,  Dwight D. Birdsall

IPC分类号： G11C27/02 ,  H03F3/50 ,  H03F3/72 ,  H03K17/00 ,  H03K17/74 ,  H03K5/24

CPC分类号： H03F3/50 ,  G11C27/026 ,  H03F3/72 ,  H03K17/74 ,  H03K2217/0036

摘要： A diode bridge includes a plurality of diodes for coupling an input voltage signal to a holding capacitor for sampling when the diodes are forward biased, and uncoupling the voltage signal from the capacitor for holding when the diodes are reverse biased. The diode bridge has first and second bias current nodes. A constant current drain causes a constant bias current to flow out of the bridge. A transistor connects the first node to the drain for forward biasing the diodes, whereas a transistor connects the second node to the drain for reverse biasing the diodes. A bootstrap amplifier (A2) produces a variable control voltage which controls a pair of voltage-controlled constant current sources to cause the constant bias current to flow therethrough into the bridge. A transistor (Q7) couples the control voltage to the first current source for forward biasing the diodes, whereas a transistor couples the control voltage to the second current source for reverse biasing the diodes. The transistors are all bipolar and of the same conductivity type, preferably NPN.

摘要翻译： 二极管桥包括多个二极管，用于将输入电压信号耦合到保持电容器，用于当二极管正向偏置时进行采样，以及当二极管反向偏置时，将来自电容器的电压信号与电容器断开耦合以进行保持。 二极管桥具有第一和第二偏置电流节点。 恒流漏极导致恒定的偏置电流流出桥。 晶体管将第一节点连接到漏极，用于正向偏置二极管，而晶体管将第二节点连接到漏极，以反向偏置二极管。 自举放大器（A2）产生可变控制电压，其控制一对电压控制的恒流源，以使恒定的偏置电流流过其中。 晶体管（Q7）将控制电压耦合到第一电流源以用于正向偏置二极管，而晶体管将控制电压耦合到第二电流源以反向偏置二极管。 晶体管都是双极型的，具有相同的导电类型，最好是NPN。