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CMOS input stage circuits and related methods

專利號(hào)
US10868505B1
公開(kāi)日期
2020-12-15
申請(qǐng)人
Silicon Laboratories Inc.(US TX Austin)
發(fā)明人
Mohamed M. Elsayed; Sudipta Sarkar
IPC分類
H03F3/45
技術(shù)領(lǐng)域
pmos,vcross,input,nmos,current,voltage,pair,stage,transistor,cmos
地域: TX TX Austin

摘要

Embodiments of improved CMOS input stage circuits and related methods are provided herein to maintain a near constant transconductance across an entire common-mode input voltage range of the input stage. One embodiment includes a pair of NMOS input transistors and a pair of PMOS input transistors, each coupled to receive a differential input voltages at their gate terminals; a current source coupled to source terminals of the pair of PMOS input transistors and configured to generate a current; a current steering circuit configured to steer the current to the pair of NMOS input transistors and/or to the pair of PMOS input transistors, depending on whether a common mode input voltage (CMV) is greater than, less than, or substantially equal to a cross-over voltage; and a current stealing circuit configured to reduce the current when the CMV is substantially equal to the cross-over voltage.

說(shuō)明書

In some embodiments, the third PMOS transistor (P11) may be configured to prevent or allow the second current to flow through the second pair of PMOS input transistors (P9, P10) to the second NMOS current mirror (N9, N10), depending on whether the common-mode input voltage is greater than or less than the cross-over voltage. When the common-mode input voltage is significantly greater than the cross-over voltage, for example, the third PMOS transistor (P11) may turn on to prevent the second current from flowing through the second pair of PMOS input transistors (P9, P10) to the second NMOS current mirror (N9, N10), which prevents the second NMOS current mirror (N9, N10) from generating the stolen current. Thus, the stolen current is zero when the common-mode input voltage is greater than the cross-over voltage.

When the common-mode input voltage is significantly less than the cross-over voltage, the third PMOS transistor (P11) may turn off to allow the second current to flow through the second pair of PMOS input transistors (P9, P10) to the second NMOS current mirror (N9, N10), which enables the second NMOS current mirror (N9, N10) to generate the stolen current. However, the second PMOS transistor (P8) may turn off to cut off the stolen current when the common-mode input voltage is less than the cross-over voltage. Thus, the stolen current is zero when the common-mode input voltage is less than the cross-over voltage.

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