Patent ID: 11936378
Assignee: CHONGQING GIGACHIP TECHNOLOGY CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. The interface circuit according to claim 3, wherein the high and low level generation circuit includes the second current, a second programmable resistor string, a third programmable resistor string, a first operational amplifier, and a first MOS transistor, wherein the second current, the second programmable resistor string, the third programmable resistor string and the first MOS transistor are connected in series with each other; a positive end of the first operational amplifier is connected to the common mode voltage, a negative end of the first operational amplifier is connected between the second programmable resistor string and the third programmable resistor string to form an operational amplifier feedback loop; wherein the differential mode voltage is accurately outputted by employing a switch control signal of the second current and control signals of the second programmable resistor string and the third programmable resistor string.