Low voltage differential signaling (LVDS) driving circuit

Abstract

An LVDS (Low Voltage Differential Signaling) driving circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a first resistor, a second resistor, and a bias driver. The first transistor is coupled between a supply voltage and a first node. The second transistor is coupled between the supply voltage and a second node. The third transistor is coupled between the first node and a ground voltage. The fourth transistor is coupled between the second node and the ground voltage. The first resistor is coupled between the first node and a third node. The second resistor is coupled between the second node and the third node. The bias driver generates bias signals for controlling the first, second, third, and fourth transistors according to a data signal.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation-In-Part of application Ser. No. 14 / 551,280, filed on Nov. 24, 2014, the entirety of which is incorporated by reference herein.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The disclosure generally relates to an LVDS (Low Voltage Differential Signaling) driving circuit, and more particularly, to an LVDS driving circuit with a simplified circuit structure and a high operating speed.[0004]2. Description of the Related Art[0005]Differential signaling circuits are very popular, being used in data transmission nowadays, including LVDS (Low Voltage Differential Signaling), HDMI (High-Definition Multimedia Interface), and USB (Universal Serial Bus), etc. Differential signaling circuits have power saving and noise rejection advantages. However, conventional differential signaling circuits require bias currents which are driven by current sources. With the progress in manufacturing technology, th...

AI Technical Summary

Benefits of technology

[0071]The invention provides a novel design of LVDS driving circuit. In conclusion, the proposed LVDS driving circuit has at least the following advantages compared with the prior art: (1) omitting the use of current sources and current sinks; (2) increasing the head room and widening the output range; (3) being suitable for applications of advanced processes with very low supply voltages; (4) enhancing the operating speed; (5) decreasing the manufacturing cost, and (6) enhanced signal quality for high data transmission rates.

Problems solved by technology

However, conventional differential signaling circuits require bias currents which are driven by current sources.

As a result, the current sources may have insufficient head room, and the output range of the differential signaling circuits may be very limited.

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