Low-noise low-voltage differential signal transmitter

Abstract

The invention provides a low-voltage differential signal transmitter. The low-voltage differential signal transmitter comprises transistors MP0, M1, M2, M3, M4, MN0, divider resistors R1 and R2, a transconductance amplifier, transistors MP6, MN5 and MN6 and a compensation capacitor C0, wherein the divider resistors R1 and R2 and a load resistor RT are connected at a first output end OUTP and a second output end OUTN in series, the transconductance amplifier comprises a transistor MP3, the first input end of the transconductance amplifier is connected with intermediate nodes of the divider resistors R1 and R2, the second input end of the transconductance amplifier is connected with VREF, and the output end of the transconductance amplifier is connected with a gate of the transistor MN0. The divider resistors R1 and R2, the compensation capacitor C0, the transconductance amplifier and the transistors MP6, MN5, MN6 and MN0 form a common-mode feedback circuit. Because zero points are added to the transistors MP6, MN5, MN6 and MN0 and loop compensation is achieved, a coupled access where a compensation resistor R0 and the compensation capacitor C0 are located in the prior art is avoided, and common-mode noise is lowered.

Description

【Technical field】 [0001] The invention relates to the field of circuit design, in particular to a low-noise low-voltage differential signal transmitter. 【Background technique】 [0002] With the development of semiconductor and computer technology, the clock frequency on the integrated circuit chip has reached GHz. The demand for high-speed data transmission rates between chips is far greater than Gb / s. LVDS (Low Voltage Differential Signaling) is a low-swing differential signal technology, which has the characteristics of high data transmission speed, low noise and low power consumption, and is widely used in the field of high-speed digital interfaces. [0003] In a real design, there are many non-ideal factors (such as imperfectly matched termination resistors, transmission line effects, noise) that affect the performance of the driver. The traditional low-voltage differential signal transmitter is affected by the non-ideality of the switch and the common-mode feedback co...

AI Technical Summary

Problems solved by technology

In the low-voltage differential signal transmission circuit in the prior art, the charge injection during the switching process of MP11, MP12, MN11, and MN12, and the effects of the compensation resistor R10 and the compensation capacitor C10 on the output coupling will affect the common-mode level and introduce common-mode noise

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