Low voltage differential signaling device with feedback compensation
First Claim
Patent Images
1. A low voltage differential signaling (LVDS) transmitting device, comprising:
- a signal driving circuit for generating and outputting an analog image signal to an LVDS receiving device, comprising a differential signaling device including at least four transistors, a first current source including a transistor coupled between a power source and said differential signaling device, and a second current source including at least two transistors coupled between said differential signaling device and ground; and
a signal compensation circuit in communication with said signal driving circuit, comprising;
a voltage-to-current converting circuit for generating and outputting a compensation signal as a current type in response to said analog image signal and a base signal; and
a first current mirror circuit and a second current mirror circuit for feeding said compensation signal back to said signal driving circuit, wherein said first current mirror circuit is coupled to said voltage-to-current converting circuit and ground, and said second current mirror circuit is coupled to said first current mirror circuit, a power source and a differential signaling circuit of said signal driving circuit, thereby compensating the current signal variation of said first current source so as to stabilize said analog image signal generated by said signal driving circuit.
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Abstract
A low voltage different signaling (LVDS) includes an LVDS transmitter and an LVDS receiver. The LVDS transmitter includes a feedback compensation circuit, which adjusts and stabilizes the analog image signal to be transmitted to the LVDS receiver according to the voltage difference of the analog image signal and a base signal. The feedback compensation circuit includes a voltage-to-current converting circuit and a pair of current mirror circuits.
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Citations
15 Claims
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1. A low voltage differential signaling (LVDS) transmitting device, comprising:
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a signal driving circuit for generating and outputting an analog image signal to an LVDS receiving device, comprising a differential signaling device including at least four transistors, a first current source including a transistor coupled between a power source and said differential signaling device, and a second current source including at least two transistors coupled between said differential signaling device and ground; and a signal compensation circuit in communication with said signal driving circuit, comprising; a voltage-to-current converting circuit for generating and outputting a compensation signal as a current type in response to said analog image signal and a base signal; and a first current mirror circuit and a second current mirror circuit for feeding said compensation signal back to said signal driving circuit, wherein said first current mirror circuit is coupled to said voltage-to-current converting circuit and ground, and said second current mirror circuit is coupled to said first current mirror circuit, a power source and a differential signaling circuit of said signal driving circuit, thereby compensating the current signal variation of said first current source so as to stabilize said analog image signal generated by said signal driving circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A compensation circuit for use with a signal driving circuit of a low voltage differential signaling (LVDS) transmitting device, comprising:
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a signal converting circuit receiving an analog image signal from said signal driving circuit, and generating a compensation signal according to a voltage difference between said analog image signal and a base signal; and a current mirror circuit in communication with said signal driving circuit and said signal converting circuit, comprising at least two current mirror sub-circuits for feeding said compensation signal back to a specified current source of said signal driving circuit coupled between a power source and a differential signaling device of said signal driving circuit for compensating signal variation of said signal driving circuits, wherein each of said current mirror sub-circuits includes two transistors. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for stabilizing an analog image signal outputted from a signal driving circuit of an low voltage differential signaling (LVDS) transmitter to an LVDS receiver, comprising steps of:
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shunting said analog image signal; generating a compensation signal according to a voltage difference between said shunted analog image signal and a base signal; and feeding said compensation signal to a current source of said signal driving circuit coupled between a power source and a differential signaling device of said signal driving circuit to compensate said analog image signal via at least two mirroring operations performed by two current mirror sub-circuits between said current source and said compensation signal, wherein each of said current mirror sub-circuits includes two transistors. - View Dependent Claims (15)
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Specification