公开(公告)号：US06765438B1

公开(公告)日：2004-07-20

申请号：US09998714

申请日：2001-11-01

Applicant: Richard Brosh ,  Scott C. Willis

Inventor： Richard Brosh ,  Scott C. Willis

IPC: H03F124

CPC classification number: H03F1/0272

Abstract: A transconductance power amplifier for amplifying a signal to a capacitive load, including a first N-channel enhancement MOSFET transistor operatively arranged to source current to the capacitive load, wherein the first N-channel MOSFET transistor has a threshold gate to source voltage, a second N-channel enhancement MOSFET transistor operatively arranged to sink current to the capacitive load, an operational amplifier operatively arranged to transmit and amplify an input signal to both of the first and second MOSFET transistors, and, means for biasing the first N-channel enhancement MOSFET transistor such that its gate to source voltage is always at or above its threshold when the load draws near zero current so that very little additional gate charge is required to turn it on more fully.

Abstract translation: 一种用于将信号放大到电容性负载的跨导功率放大器，包括可操作地布置成将电流源流到电容性负载的第一N沟道增强型MOSFET晶体管，其中第一N沟道MOSFET晶体管具有阈值栅极至源极电压，第二 N沟道增强型MOSFET晶体管，可操作地布置成将电流吸收到电容性负载;运算放大器，可操作地布置成向第一和第二MOSFET晶体管两者传输和放大输入信号;以及用于偏置第一N沟道增强型MOSFET 晶体管，使得当负载吸收接近零电流时，其栅极至源极电压总是处于或高于其阈值，因此需要非常少的额外栅极电荷使其更充分地完全。

公开(公告)号：US06175275B1

公开(公告)日：2001-01-16

申请号：US09406874

申请日：1999-09-28

Applicant: Michel Barou ,  Danika Chaussy

Inventor： Michel Barou ,  Danika Chaussy

IPC: H03F124

CPC classification number: H03G5/18 ,  H03F3/19 ,  H03G5/04 ,  H04N5/148

Abstract: A preamplifier includes an output stage having a bandwidth which is adjustable by a control signal. The output stage includes an amplifier with an adjustable bandwidth. The amplifier includes a main input for receiving an input current, a main output for providing an output voltage, a resistor connected between the main input and output. A current amplifier with an adjustable gain is connected for receiving the input current. A capacitor is connected between an output of the current amplifier and the main output. An inverting transconductance circuit is connected between the output of the current amplifier and the main output.

Abstract translation: 前置放大器包括具有可由控制信号调节的带宽的输出级。 输出级包括具有可调节带宽的放大器。 放大器包括用于接收输入电流的主输入端，用于提供输出电压的主输出端，连接在主输入端和输出端之间的电阻器。 连接具有可调增益的电流放大器，用于接收输入电流。 电容器连接在电流放大器的输出端和主输出端之间。 反相跨导电路连接在电流放大器的输出端和主输出端之间。

公开(公告)号：US06388516B1

公开(公告)日：2002-05-14

申请号：US09709093

申请日：2000-11-08

Applicant: Samuel K. Doran ,  William A. Enichen

Inventor： Samuel K. Doran ,  William A. Enichen

IPC: H03F124

CPC classification number: H03F3/347 ,  H03F3/45475 ,  H03F3/45973 ,  H03F2200/372

Abstract: Accuracy of correction of offset drift with temperature and noise are corrected in a high voltage, high current amplifier is improved by thermal isolation and/or temperature regulation of another amplifier having greater gain and connected to a different power supply in a closed loop feedback servo system. A clamping network connected to the higher gain amplifier to avoid hard saturation due to transient feedback signals from a reactive load, especially an inductive load, also prevents hard saturation of the high voltage, high current amplifier. An adjustable feedback circuit connected to the higher gain amplifier allows adjustment to obtain critical damping of a second order system and faster response to achieve proportionality of output current to input voltage with an accuracy of very few parts per million error and with minimum settling time.

Abstract translation: 通过温度和噪声校正偏移漂移的精度在高电压下进行校正，通过具有较大增益的另一放大器的热隔离和/或温度调节来改善高电流放大器，并连接到闭环反馈伺服系统中的不同电源 。 连接到较高增益放大器的钳位网络，以避免由于来自无功负载，特别是感性负载的瞬态反馈信号引起的硬饱和，也可防止高电压，高电流放大器的硬饱和。 连接到较高增益放大器的可调节反馈电路允许调整以获得二阶系统的临界阻尼和更快的响应，以实现输出电流与输入电压的成比例，具有极小的百万分之几的误差和最小的建立时间。

公开(公告)号：US06833757B2

公开(公告)日：2004-12-21

申请号：US09727060

申请日：2000-11-30

Applicant: Randall J. Stephens ,  Teddy D. Thomas

Inventor： Randall J. Stephens ,  Teddy D. Thomas

IPC: H03F124

CPC classification number: H03F1/0277 ,  H03F3/2171 ,  H03F3/45475 ,  H03F2200/432

Abstract: One aspect of the invention is an amplifier (10), comprising an input stage amplifier (20) coupled to an output node (81). The amplifier (10) further comprises a class D output stage (50), which comprises at least two switching elements (P1, N1) and coupled to the output node (81). The amplifier (10) also comprises a control circuit (40) coupled to the output stage (50). The control circuit (40) is operable to produce a tri-state output of the output stage (50) in response to a sensed value proportional to an amount of current that flows to the output node (81).

Abstract translation: 本发明的一个方面是放大器（10），包括耦合到输出节点（81）的输入级放大器（20）。 放大器（10）还包括D类输出级（50），其包括至少两个开关元件（P1，N1）并耦合到输出节点（81）。 放大器（10）还包括耦合到输出级（50）的控制电路（40）。 响应于与流向输出节点（81）的电流量成比例的感测值，控制电路（40）可操作以产生输出级（50）的三态输出。

公开(公告)号：US06642783B2

公开(公告)日：2003-11-04

申请号：US09950851

申请日：2001-09-12

Applicant: Nicolas Constantinidis ,  Guillaume Crinon

Inventor： Nicolas Constantinidis ,  Guillaume Crinon

IPC: H03F124

CPC classification number: H03F1/3211 ,  H03F3/602 ,  H03F3/68

Abstract: The invention relates to an amplification device AD, comprising a first and a second amplifier AMP1 and AMP2, arranged in cascade, each amplifier being provided with a feedback loop Zi (where i=1 or 2) and having a gain proper Gi equal to Ai/(1+Ai.Zi). In accordance with the invention, the value of the inverse of the gain proper Gi of the first amplifier AMP1 is substantially equal to three times the value of the inverse of the gain proper G2 of the second amplifier AMP2 raised to the power of three: (1/G1)=3/(G2)3. Such a choice provides the amplification device AD with an optimum linearity.

Abstract translation: 本发明涉及放大装置AD，其包括级联布置的第一和第二放大器AMP1和AMP2，每个放大器设置有反馈环Zi（其中i = 1或2）并且具有等于Ai的增益正确Gi /(1+Ai.Zi）。 根据本发明，第一放大器AMP1的增益适当Gi的倒数的值基本上等于第三放大器AMP2的增益适当G2的反向增加到三的幂的三倍： 1 / G1）= 3 /（G2）<3>。 这种选择为放大装置AD提供了最佳线性。

公开(公告)号：US06208205B1

公开(公告)日：2001-03-27

申请号：US09351168

申请日：1999-07-12

Applicant: William E. Main ,  Danielle L. Coffing

Inventor： William E. Main ,  Danielle L. Coffing

IPC: H03F124

CPC classification number: H03F3/45085 ,  H03F1/56 ,  H03F3/195

Abstract: A transconductance amplifier (67) includes a multiple-stage amplifier (99) for amplifying an Intermediate Frequency (IF) signal. The transconductance amplifier includes a feedback path (103) having a resistance (105) for providing a feedback signal from an output of the multiple-stage amplifier (99) to an input of the multiple-stage amplifier (99). The resistance (105) of the feedback path (103) is selected so that an input impedance of the transconductance amplifier is equal to a source impedance at an input terminal (82) of the transconductance amplifier (67) and an output impedance of the transconductance amplifier (67) is equal to a load impedance at an output terminal (84) of the transconductance amplifier (67).

Abstract translation: 跨导放大器（67）包括用于放大中频（IF）信号的多级放大器（99）。 跨导放大器包括具有用于从多级放大器（99）的输出到多级放大器（99）的输入的反馈信号的电阻（105）的反馈路径（103）。 选择反馈路径（103）的电阻（105），使得跨导放大器的输入阻抗等于跨导放大器（67）的输入端（82）处的源阻抗和跨导的输出阻抗 放大器（67）等于跨导放大器（67）的输出端子（84）处的负载阻抗。