公开(公告)号：US11876496B2

公开(公告)日：2024-01-16

申请号：US17386979

申请日：2021-07-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Vadim Valerievich Ivanov ,  Srinivas Kumar Pulijala

IPC: H03F3/45 ,  H03F1/52

CPC classification number: H03F3/45179 ,  H03F1/52 ,  H03F2200/426

Abstract: Differential input circuits employ protection transistors and feedback paths to limit the differential voltage applied to input transistors. In an example arrangement, a differential input voltage is applied to terminals of the protection transistors, and current paths couple the respective protection transistors to control terminals of the input transistors, respectively. A control terminal drive voltage source is coupled to the control terminals of the input protection transistors to control the drive voltage applied to those terminals. Feedback paths, one for each of the input transistors, control voltages applied to the control terminals of the input transistors, maintaining the input differential voltage at a relatively low level and defined by the product of a specified current value and a specified resistance value.

公开(公告)号：US20230118397A1

公开(公告)日：2023-04-20

申请号：US17501210

申请日：2021-10-14

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： VADIM VALERIEVICH IVANOV ,  Srinivas Kumar Pulijala

IPC: H03F3/393 ,  H03F3/45

Abstract: In examples of a chopper operational amplifier, a current control circuit comprises a pair of voltage sources, each of which may be varied to generate a voltage signal of a particular value, and multiple inverters, each of which is configured to receive either a clock signal or its complement signal and one of the voltage signals. Based on these inputs, each inverter generates a control signal that is delivered to a corresponding switch in the input stage of the chopper operational amplifier to control the gate voltage of that switch. Based on the difference between the values of the voltage signals, the current control circuit operates to reduce the amplitudes of base currents induced by charge injection at the input terminals of the chopper operational amplifier.