Method of fabricating high breakdown voltage FETs
    2.
    发明授权
    Method of fabricating high breakdown voltage FETs 失效
    制造高耐压FET的方法

    公开(公告)号:US5514606A

    公开(公告)日:1996-05-07

    申请号:US270275

    申请日:1994-07-05

    摘要: A method of fabricating high breakdown voltage MESFETs forming a conduction channel in a GaAs substrate adjacent the surface, forming high temperature stable source and drain ohmic contacts and a Schottky gate contact on the surface of the substrate in overlying relationship to the channel and in spaced relationship, and depositing a layer of low temperature GaAs passivation material over the substrate surface and the source, drain and gate contacts. Openings are then etched in the passivation material for contacting the source, drain and gate contacts.

    摘要翻译: 制造在击穿表面附近的GaAs衬底中形成导电沟道的高耐压MESFET的方法,在衬底的表面上形成高温稳定的源极和漏极欧姆接触和肖特基门接触,并以间隔的关系 ,并在衬底表面和源极,漏极和栅极触点上沉积一层低温GaAs钝化材料。 然后在钝化材料中蚀刻开口以接触源极,漏极和栅极触点。

    High frequency semiconductor transistor
    3.
    发明授权
    High frequency semiconductor transistor 失效
    高频半导体晶体管

    公开(公告)号:US5640025A

    公开(公告)日:1997-06-17

    申请号:US566386

    申请日:1995-12-01

    CPC分类号: H01L29/7371

    摘要: A high frequency transistor including a heavily doped first current carrying layer positioned on a substrate and a semi-insulating layer of LTGaAs epitaxially grown on the first layer. The semi-insulating layer is etched, using a layer of AlAs as an etch stop, to define an active region and a first current carrying electrode is grown on the exposed first layer in the active region. A control layer is grown on the semi-insulating layer and the first current carrying electrode, and a second current carrying electrode is grown on the control layer. External contacts are formed on the first current carrying layer, the control layer, and the second current carrying electrode.

    摘要翻译: 包括位于衬底上的重掺杂的第一载流层和在第一层上外延生长的LTGaAs的半绝缘层的高频晶体管。 使用AlAs层作为蚀刻停止层来蚀刻半绝缘层以限定有源区,并且在有源区中暴露的第一层上生长第一载流电极。 控制层生长在半绝缘层上,第一载流电极和第二载流电极在控制层上生长。 外部触点形成在第一载流层,控制层和第二载流电极上。

    Monolithic inductor with magnetic flux lines guided away from substrate
    5.
    发明授权
    Monolithic inductor with magnetic flux lines guided away from substrate 失效
    具有导线离开衬底的磁通线的单片电感器

    公开(公告)号:US06281778B1

    公开(公告)日:2001-08-28

    申请号:US09442375

    申请日:1999-11-17

    IPC分类号: H01F500

    摘要: A monolithic inductor (20, 20′) is formed over a silicon or other substrate (22). The inductor (20, 20′) includes at least one coil (62, 78) arranged so that its axis (58) is parallel to the substrate (22). Other inductive features, such as other coils (64, 70, 72) or planar spirals (74, 76) are arranged in series with the coil (62, 78) to guide magnetic flux lines away from the substrate (22). In one embodiment, a common thin film coil core (60) made from a magnetic material is provided for two coils (62, 64). The coil core (60) provides a continuous magnetic material flux path through the two coils (62, 64). In another embodiment, an axis (58) of the coil (78) is located between the plane in which two spirals (74, 76) are located and the substrate (22) to guide magnetic flux lines (82) away from the substrate (22).

    摘要翻译: 在硅或其它衬底(22)上形成单片电感器(20,20')。 电感器(20,20')包括布置成使得其轴线(58)平行于衬底(22)的至少一个线圈(62,78)。 诸如其它线圈(64,70,72)或平面螺旋(74,76)的其它电感特征与线圈(62,78)串联布置以将磁通线引导离开衬底(22)。 在一个实施例中,为两个线圈(62,64)提供由磁性材料制成的公共薄膜线圈芯(60)。 线圈芯(60)提供穿过两个线圈(62,64)的连续的磁性材料通量路径。 在另一个实施例中,线圈(78)的轴线(58)位于两个螺旋(74,76)所在的平面和衬底(22)之间,以引导磁通线(82)远离衬底( 22)。

    Communications receiver with integrated IF filter and method therefor
    7.
    发明授权
    Communications receiver with integrated IF filter and method therefor 失效
    具有集成IF滤波器的通信接收器及其方法

    公开(公告)号:US06885853B2

    公开(公告)日:2005-04-26

    申请号:US09833438

    申请日:2001-04-11

    IPC分类号: H03J3/08 H04B1/06

    CPC分类号: H03J3/08

    摘要: A receiver (22) includes an IF filter (44) and a nearby process-variant circuit (80) formed on a common semiconductor substrate (24). The actual center frequency of the IF filter (44) is determined by resistors (70, 74) and capacitors (72, 76) exhibiting imprecise values and is unlikely to equal a nominal center frequency. The process-variant circuit (80) includes a test resistor (102) and test capacitor (104) formed using the same resistor-forming and capacitor-forming processes used to form the IF filter resistors (70, 74) and capacitors (72, 76). In response a test signal (88) from the process-variant circuit (80) and a reference signal (84) from a process-invariant circuit (82), a tuning parameter for a tunable local oscillator (90) is determined so that a local oscillation signal (94) will exhibit a frequency which, when mixed with an RF signal (38) yields an IF signal (42) at the actual center frequency of the IF filter (44).

    摘要翻译: 接收器(22)包括形成在公共半导体衬底(24)上的IF滤波器(44)和附近的过程变量电路(80)。 中频滤波器(44)的实际中心频率由电阻(70,74)和显示不精确值的电容器(72,76)确定,并且不太可能等于标称中心频率。 过程变量电路(80)包括使用与形成IF滤波电阻(70,74)和电容器(72,74)相同的电阻器形成和电容器形成工艺形成的测试电阻器(102)和测试电容器(104) 76)。 响应于来自过程变量电路(80)的测试信号(88)和来自过程不变电路(82)的参考信号(84),确定可调谐本地振荡器(90)的调谐参数,使得 本地振荡信号(94)将呈现频率,当与RF信号(38)混合时,IF滤波器(44)的实际中心频率产生IF信号(42)。

    Method of forming heterojunction bipolar transistor having wide bandgap, low interdiffusion base-emitter junction
    8.
    发明授权
    Method of forming heterojunction bipolar transistor having wide bandgap, low interdiffusion base-emitter junction 失效
    形成具有宽带隙,低互扩散基极 - 发射极结的异质结双极晶体管的方法

    公开(公告)号:US06171920B2

    公开(公告)日:2001-01-09

    申请号:US09267252

    申请日:1999-03-12

    IPC分类号: H01L21331

    摘要: A heterojunction bipolar transistor (20) is provided with a silicon (Si) base region (34) that forms a semiconductor junction with a multilayer emitter (38) having a thin gallium arsenide (GaAs) emitter layer (36) proximate the base region (34) and a distal gallium phosphide emitter layer (40). The GaAs emitter layer (36) is sufficiently thin, preferably less than 200 Å, so as to be coherently strained.

    摘要翻译: 异质结双极晶体管(20)设置有硅(Si)基区(34),其与具有接近基极区域(GaAs)的薄砷化镓(GaAs)发射极层(36)的多层发射极(38)形成半导体结, 34)和远端磷化镓发射极层(40)。 GaAs发射极层(36)足够薄,优选小于200,以致相干地变形。

    Vertical heterojunction bipolar transistor
    10.
    发明授权
    Vertical heterojunction bipolar transistor 失效
    垂直异质结双极晶体管

    公开(公告)号:US06423990B1

    公开(公告)日:2002-07-23

    申请号:US09441576

    申请日:1999-11-17

    IPC分类号: H01L310328

    摘要: A heterojunction bipolar transistor (20, 60) is provided with a silicon (Si) base region (34, 74) that forms a semiconductor junction with a multilayer emitter (38) having a thin gallium arsenide (GaAs) emitter layer (36, 72) proximate the base region (34, 74) and a distal gallium phosphide (GaP) emitter layer (40, 66). The GaAs emitter layer (36, 72) is sufficiently thin, preferably less than 200 Å, so as to be coherently strained. In one embodiment, the GaP emitter layer includes a doped region (70) which serves as the emitter and a non-doped region (68) on which the intrinsic portion of the transistor (60) is formed.

    摘要翻译: 异质结双极晶体管(20,60)设置有与具有薄砷化镓(GaAs)发射极层(36,72)的多层发射极(38)形成半导体结的硅(Si)基区(34,74) )接近所述基极区(34,74)和远端磷化镓(GaP)发射极层(40,66)。 GaAs发射极层(36,72)足够薄,优选小于200,以使其相干应变。 在一个实施例中,GaP发射极层包括用作发射极的掺杂区域(70)和形成晶体管(60)本征部分的非掺杂区域(68)。