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1. 发明授权

US4430621A CMOS Polarity switch 失效
标题翻译： CMOS极性开关
公开(公告)号：US4430621A
公开(公告)日：1984-02-07
申请号：US265876
申请日：1981-05-21
申请人： James B. Wieser , Suman H. Patel
发明人： James B. Wieser , Suman H. Patel
IPC分类号： H03F1/30 , H03F3/45
CPC分类号： H03F1/303
摘要： A linear differential amplifier is fabricated in CMOS and combined with digital control so that an analog input signal can be converted to a selected output polarity. When the amplifier output is coupled directly to the inverting input the noninverting input provides a unity gain voltage follower configuration. To create a unity gain signal inverter, a matched pair of resistors is employed. One resistor is coupled between the amplifier output and the inverting input while the other is coupled between the analog signal input and the inverting input. In operation digital control is employed in switching between the two configurations. The sense of the differential amplifier is reversed when switching between configurations thereby to provide a substantial reduction of the effect of offset potential. To fully compensate the offset potential, a capacitor is periodically coupled across the amplifier input to charge it to the offset potential. Then an equal value capacitor is connected in parallel thus having the potential and the combination coupled to the noninverting amplifier input during the time when the inverting configuration is in operation. The same amplifier offset is present in both configurations, but in opposite polarities, and therefore produces equal, but opposite V.sub.REF switching through digital control.
摘要翻译：线性差分放大器采用CMOS制造，并结合数字控制，使得模拟输入信号可以转换为选定的输出极性。当放大器输出直接耦合到反相输入时，非反相输入提供单位增益电压跟随器配置。为了产生单位增益信号反相器，采用一对匹配的电阻。一个电阻耦合在放大器输出和反相输入端之间，另一个耦合在模拟信号输入端和反相输入端之间。在操作中，数字控制用于在两种配置之间进行切换。当在配置之间切换时，差分放大器的感觉被反转，从而大大降低了补偿电位的影响。为了完全补偿偏移电流，电容器周期性地耦合在放大器输入端，以将其充电到偏移电位。然后，等效电容器并联连接，从而具有在反相配置运行期间耦合到非反相放大器输入的电位和组合。在两种配置中都存在相同的放大器偏移，但是具有相反的极性，因此通过数字控制产生相等但相反的VREF切换。

2. 发明授权

US4001722A Integrated circuit relaxation oscillator 失效
标题翻译：集成电路放松振荡器
公开(公告)号：US4001722A
公开(公告)日：1977-01-04
申请号：US578517
申请日：1975-05-19
申请人： Suman H. Patel , Thomas Jones
发明人： Suman H. Patel , Thomas Jones
IPC分类号： H03K3/354 , H03K4/501 , H03K3/353
CPC分类号： H03K3/3545 , H03K3/354 , H03K4/501
摘要： An integrated circuit relaxation oscillator includes a capacitor, a resistor forming a conductive path for charging the capacitor, a transistor for discharging the capacitor, and a control circuit responsive to the level of charge on the capacitor for controlling the conduction level of the transistor. The control circuit has a relatively high trip point while it is in one state and during the time that the capacitor is being charged, and a relatively low trip point while it is in a second state and during the time that the capacitor is being discharged. The control circuit is balanced, such that variations in process parameters and variations in the voltage level of the power supply do not appreciably affect the period of the oscillatory output signal.

3. 发明授权

US4476476A CMOS Input and output protection circuit 失效
标题翻译： CMOS输入和输出保护电路
公开(公告)号：US4476476A
公开(公告)日：1984-10-09
申请号：US249934
申请日：1981-04-01
申请人： James C. Yu , Suman H. Patel
发明人： James C. Yu , Suman H. Patel
IPC分类号： H01L27/02 , H01L27/092 , H01L27/04
CPC分类号： H01L27/0251 , H01L27/0921
摘要： A CMOS gate protection diode clamping the input terminal to substrate potential is prevented from injecting carriers into the substrate and causing SCR latchup by forming the diode as a well to substrate junction, surrounded by another, reverse-biased, well, to both reduce injection and collect parasitic injected carriers before they can diffuse to cause latchup.
摘要翻译：防止将输入端子钳位到衬底电位的CMOS栅极保护二极管将载流子注入到衬底中，并且通过将二极管形成为衬底结，并被另一个反向偏压阱包围，从而使SCR闭锁，以减少注入和收集寄生注射载体，然后才能扩散以引起闭锁。

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