公开(公告)号：US06380805B1

公开(公告)日：2002-04-30

申请号：US09444015

申请日：1999-11-19

申请人： Stephen F. Bily ,  Lei Wang

发明人： Stephen F. Bily ,  Lei Wang

IPC分类号： H03F345

CPC分类号： H03F3/4521 ,  H03F3/45708 ,  H03F2203/45371 ,  H03F2203/45421

摘要： In accordance with the present invention complementary P-channel and N-channel input pairs of transistors form in an op amp. Two sets of such pairs are provided so that a transconductance range of each set of pairs is different. By combining the outputs of each of the sets of P-channel and N-channel pairs, a transconductance glitch is reduced in half.

摘要翻译： 根据本发明，在运算放大器中形成互补的P沟道和N沟道输入对晶体管。 提供两组这样的对，使得每组对的跨导范围不同。 通过组合每个P沟道和N沟道对的输出，跨导毛刺减少一半。

公开(公告)号：US5585763A

公开(公告)日：1996-12-17

申请号：US413994

申请日：1995-03-30

申请人： Mohammad J. Navabi ,  Baker P.L. Scott, III ,  Stephen F. Bily

发明人： Mohammad J. Navabi ,  Baker P.L. Scott, III ,  Stephen F. Bily

IPC分类号： H03F3/30 ,  H03F3/72 ,  H04L25/02 ,  H03F3/26

CPC分类号： H04L25/0278 ,  H03F3/3001 ,  H03F3/3081 ,  H03F3/72 ,  H03F2203/30057 ,  H03F2203/30096 ,  H03F2203/30129 ,  H04L25/028

摘要： An amplifier with controlled output impedance utilizing current and voltage feedback to set gain and output impedance is disclosed. The voltage feedback is provided by feedback resistor connected from the output to the inverting input. The current feedback is provided by feeding a current proportional to the output current directly to the inverting input of the amplifier. An error amplifier is used to maintain the proper ratio of the current feedback to the output current and to cancel the effects of the output device impedance on the overall output impedance. Two such amplifiers driven by complimentary signals form a differential amplifier with controlled output impedance. Because the output impedance is a function of the voltage feedback resistance and the current feedback ratio, it is possible to digitally control the output impedance by changing the feedback resistance and/or the current feedback ratio.

摘要翻译： 公开了一种利用电流和电压反馈来控制输出阻抗来设置增益和输出阻抗的放大器。 电压反馈由从输出端连接到反相输入端的反馈电阻提供。 通过将与输出电流成比例的电流直接馈送到放大器的反相输入端来提供电流反馈。 使用误差放大器来保持电流反馈与输出电流的适当比例，并消除输出器件阻抗对整体输出阻抗的影响。 由互补信号驱动的两个这样的放大器形成具有受控输出阻抗的差分放大器。 由于输出阻抗是电压反馈电阻和电流反馈比的函数，因此可以通过改变反馈电阻和/或电流反馈比来数字地控制输出阻抗。

公开(公告)号：US4988954A

公开(公告)日：1991-01-29

申请号：US345320

申请日：1989-04-28

申请人： Kenneth J. Stern ,  Stephen F. Bily

发明人： Kenneth J. Stern ,  Stephen F. Bily

IPC分类号： H03F1/02 ,  H03F3/26 ,  H03F3/30

CPC分类号： H03F3/3022 ,  H03F1/02 ,  H03F1/0261 ,  H03F3/265 ,  H03F3/3001

摘要： A linear power amplifier having differential push-pull outputs, in which each output consists of an upper and a lower output transistor, includes cross-coupling transistors coupled between the gate of each of the output transistors and a reference voltage such that when the cross-coupled transistor is made conductive, it acts to turn off its associated output transistor. Each of the cross-coupled transistors is controlled by the voltage at the gate of the corresponding output transistor at the other of the differential outputs. Thus, the cross-coupling transistors insure that only one of the upper output transistors is on at one time and only one of the lower output transistors is on at any one time. These cross-coupling transistors operate in conjection with output stage shutoff circuitry to control the current wasted in the output stages of the linear power amplifier by ensuring that the output transistors at each output are not both conducting a significant amount of current at any one time. The output stage shutoff circuitry is activated by an external signal which is active when the differential input voltage to the amplifier is zero. During this time the output stage shutoff circuitry isolates the output transistors from the input stages, and forces the output transistors to be nonconductive. The cross-coupled control technique is also applied to single output stages in which cross-coupling transistors cause their respective output transistor to turn off when the other output transistor is conducting significant current.

摘要翻译： 具有差分推挽输出的线性功率放大器，其中每个输出由上部和下部输出晶体管组成，包括耦合在每个输出晶体管的栅极之间的交叉耦合晶体管和参考电压， 耦合晶体管导通，它用于关断其相关的输出晶体管。 每个交叉耦合晶体管由在另一个差分输出处的相应输出晶体管的栅极处的电压来控制。 因此，交叉耦合晶体管确保只有一个上部输出晶体管同时导通，并且只有一个下部输出晶体管在任何一个时间导通。 这些交叉耦合晶体管与输出级截止电路结合起来，通过确保每个输出端的输出晶体管在任何一个时间都不会同时导通大量的电流来控制浪费在线性功率放大器的输出级中的电流。 输出级关断电路由外部信号激活，外部信号在放大器的差分输入电压为零时有效。 在此期间，输出级关断电路将输出晶体管与输入级隔离，并迫使输出晶体管不导通。 交叉耦合控制技术也适用于单输出级，其中交叉耦合晶体管使其相应的输出晶体管在另一输出晶体管导通有效电流时截止。