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Low voltage differential signaling (LVDS) driving circuit

a driving circuit and low voltage technology, applied in logic circuits, oscillation generators, pulse techniques, etc., can solve the problems of insufficient head room of current sources and limited output range of differential signaling circuits

Active Publication Date: 2016-05-26
VIA ALLIANCE SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This design expands the output range of the LVDS driving circuit, reduces manufacturing costs, and enhances operating speed, making it suitable for low-voltage systems with advanced processes while maintaining high-speed accuracy.

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.

Method used

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  • Low voltage differential signaling (LVDS) driving circuit
  • Low voltage differential signaling (LVDS) driving circuit
  • Low voltage differential signaling (LVDS) driving circuit

Examples

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Embodiment Construction

[0030]In order to illustrate the purposes, features and advantages of the invention, the embodiments and figures of the invention are described in detail as follows.

[0031]FIG. 1 is a diagram of an LVDS (Low Voltage Differential Signaling) driving circuit 100 according to an embodiment of the invention. The LVDS driving circuit 100 includes a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a first resistor R1, a second resistor R2, and a bias driver 110. The bias driver 110 generates a first bias signal SB1, a second bias signal SB2, a third bias signal SB3, and a fourth bias signal SB4 for controlling the first transistor M1, the second transistor M2, the third transistor M3, and the fourth transistor M4, respectively, according to a data signal DATA. The data signal DATA may be a digital signal. In some embodiments, the first transistor M1 and the second transistor M2 are PMOS transistors (P-type Metal Oxide Semiconductor Field Effect Tra...

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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

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]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.[0003]2. Description of the Related Art[0004]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, the supply voltage of circuits has gradually become lower. As a result, the current sources may have insufficient head room, and the output range of the differential signaling circuits may be very limited.BRI...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H03K19/0185
CPCH03K19/018514H03K5/131H03K5/135H03K19/01812H03K19/018528
Inventor LEE, YEONG-SHENG
Owner VIA ALLIANCE SEMICON CO LTD
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