专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5530444A Differential amplifiers which can form a residue amplifier in sub-ranging A/D converters 失效
标题翻译：差分放大器可在子范围A / D转换器中形成残留放大器
公开(公告)号：US5530444A
公开(公告)日：1996-06-25
申请号：US368862
申请日：1995-01-05
申请人： Thomas E. Tice , David T. Crook , Kevin M. Kattmann , Charles D. Lane
发明人： Thomas E. Tice , David T. Crook , Kevin M. Kattmann , Charles D. Lane
IPC分类号： H03F1/08 , H03F3/45 , H03M1/16 , H03M1/14
CPC分类号： H03F3/45098 , H03F1/083 , H03F3/45085 , H03F2203/45392 , H03F2203/45702 , H03F2203/45722 , H03F2203/5003 , H03M1/16
摘要： Open-loop differential amplifiers (120, 140) are disclosed which have accurate and stable gain. The gain of these amplifiers is substantially insensitive to the effects of small-signal emitter resistance r.sub.e, current gain .beta. and Early voltage V.sub.A. Thus, their gain can be accurately set by resistance ratios which makes them particularly useful in integrated circuits. These advantages are obtained with an output differential pair (67) that has cross-coupled base and collector terminals. In addition, resistors (141, 143, 148, 150) and a current source (146) associated with this differential pair are related to like elements (27, 28, 24, 25 and 26) that are associated with an input differential pair (21) by disclosed numerical ratios, e.g., the nominal gain G of the amplifier. Versions of the amplifiers can be adapted for use as a residue amplifier (162) in a subranging A/D converter (160).
摘要翻译：公开了具有准确和稳定增益的开环差分放大器（120,140）。这些放大器的增益对小信号发射极电阻re，电流增益β和早期电压VA的影响基本上不敏感。因此，它们的增益可以通过电阻比来精确地设定，这使得它们在集成电路中特别有用。这些优点通过具有交叉耦合基极和集电极端子的输出差分对（67）获得。另外，与该差分对相关联的电阻（141,143,148,150）和电流源（146）与与输入差分对相关联的相似元件（27,28,24,25和26）有关 21）通过公开的数值比例，例如放大器的标称增益G。放大器的版本可以适用于在亚排A / D转换器（160）中的残留放大器（162）。

2. 发明授权

US5568092A Attenuated feedback type differential amplifier 失效
标题翻译：衰减反馈型差分放大器
公开(公告)号：US5568092A
公开(公告)日：1996-10-22
申请号：US449528
申请日：1995-05-24
申请人： Toshifumi Shimizu , Hiroshi Narikawa , Yoshiyuki Tamura
发明人： Toshifumi Shimizu , Hiroshi Narikawa , Yoshiyuki Tamura
IPC分类号： H03F1/08 , H03F1/34 , H03F3/45
CPC分类号： H03F1/34 , H03F3/45089 , H03F2203/45302 , H03F2203/45374 , H03F2203/45702 , H03F2203/45722 , H03F2203/5003
摘要： A differential amplifier includes an input stage for receiving input signals, an output stage for generating output signals, and an attenuating circuit for attenuating the output signals and feeding attenuation signals back to the input stage. The input stage includes a current switch formed by two transistors connected commonly to a current source and each connected to two load amplifiers. The load amplifiers are controlled by the attenuation signal, to substantially reduce the amplification of the two transistors.
摘要翻译：差分放大器包括用于接收输入信号的输入级，用于产生输出信号的输出级，以及用于衰减输出信号并将衰减信号馈送回输入级的衰减电路。输入级包括由共同连接到电流源并且分别连接到两个负载放大器的两个晶体管形成的电流开关。负载放大器由衰减信号控制，以显着降低两个晶体管的放大率。

3. 发明授权

US5325070A Stabilization circuit and method for second order tunable active filters 失效
标题翻译：二阶可调谐有源滤波器稳定电路及方法
公开(公告)号：US5325070A
公开(公告)日：1994-06-28
申请号：US8103
申请日：1993-01-25
申请人： Michael McGinn
发明人： Michael McGinn
IPC分类号： H03F3/45 , H03H11/04
CPC分类号： H03F3/45085 , H03F2203/45476 , H03F2203/45496 , H03F2203/45578 , H03F2203/45594 , H03F2203/45612 , H03F2203/45656 , H03F2203/45696 , H03F2203/5003 , H03H11/0422
摘要： An active filter circuit (10) that has a cut off frequency being substantially independent of absolute and temperature variations due to on chip resistors (R.sub.1, R.sub.2 and R.sub.3) has been provided. The active filter includes a transconductance gain amplifier (16) having first and second currents (I.sub.B and I.sub.E) the ratio of which are controlled such that the absolute and temperature effects of any on chip resistors of the active filter circuit are removed. The ratio of the first and second currents of the transconductance gain amplifier are controlled by a circuit that generates third and fourth currents (I.sub.b and I.sub.e) which are a function of a bandgap voltage. The circuit then utilizes the third and fourth currents and provides, to the transconductance gain amplifier, a current that is substantially equal to the ratio of square of the third current to the fourth current, and a current substantially equal to the fourth current.
摘要翻译：已经提供了一种有源滤波器电路（10），其截止频率基本上与由片上电阻器（R1，R2和R3）导致的绝对和温度变化无关。有源滤波器包括具有第一和第二电流（IB和IE）的跨导增益放大器（16），其比例被控制，使得有源滤波器电路的任何片上电阻器的绝对和温度效应被去除。跨导增益放大器的第一和第二电流的比率由产生作为带隙电压的函数的第三和第四电流（Ib和Ie）的电路来控制。电路然后利用第三和第四电流，并向跨导增益放大器提供基本上等于第三电流与第四电流的平方比的电流，以及基本上等于第四电流的电流。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式