Low voltage differential signaling drivers including branches with series resistors
AssigneeSamsung Electronics Co., Ltd.
InventorJin-hyun Kim
Life of this patent
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Abstract
A low voltage differential signal driver includes first and second current sources, a first branch and a second branch. The first branch includes at least two transistors and at least two resistors between them that are all connected in series between the first and second current sources, to define a first node between adjacent resistors that is configured to transmit and receive differential signals. The second branch also includes at least two transistors and at least two resistors between them that also are all connected in series between the first and second current sources, to define a second node between adjacent resistors that is also configured to transmit and receive differential signals.
Claims39
A low voltage differential signaling driver comprising:
- first and second current sources;
- a first branch, which comprises at least two transistors and at least two resistors therebetween that are all connected in series between the first and second current sources to define a first node between adjacent resistors that is configured to transmit and receive differential signals;
- and
- a second branch, which comprises at least two transistors and at least two resistors therebetween that also are all connected in series between the first and second current sources to define a second node between adjacent resistors that is also configured to transmit and receive differential signals.
A low voltage differential signaling driver comprising:
- a driving unit which is configured to output a pull-down signal having a first common mode voltage level and a pull-up signal having a second common mode voltage level in response to a control signal, a clock signal, and data;
- a transmission unit which is configured to output an output differential signal via transmission lines in response to the pull-up signal and the pull-down signal output from the driving unit;
- and
- a reception unit which is configured to receive an input differential signal via the transmission lines,
- wherein the transmission unit comprises:
- first and second current sources;
- a first branch, which comprises at least two transistors and at least two resistors therebetween that are all connected in series between the first and second current sources to define a first node between adjacent resistors that is configured to transmit and receive differential signals;
- and
- a second branch, which comprises at least two transistors and at least two resistors therebetween that also are all connected in series between the first and second current sources to define a second node between adjacent resistors that is also configured to transmit and receive differential signals.
A data communication system comprising:
- first and second low voltage differential signaling drivers which are connected to each other via transmission lines and transmit data to or receive data from each other via the transmission lines,
- wherein the first low voltage differential signaling driver comprises a driving unit, which is configured to reduce signal reflections using termination resistance which is same as load resistance of the second low voltage differential signaling driver and is configured to enhance the speed of transmitting data by controlling the logic level of the data, and the second low voltage differential signaling driver has same structure as the first low voltage differential signaling driver.
A data communication method for a low voltage differential signaling driver which comprises first and second branches and a control switch which controls the reception of a differential signal and transmits and receives the differential signal via transmission lines in response to data, the data communication method comprising:
- determining whether to transmit or receive a differential signal;
- turning off the control switch if it is determined to transmit the differential signal;
- selectively turning on transistors included in the first and second branches according to the voltage level of data input to the low voltage differential signaling driver;
- and
- outputting the differential signal to the transmission lines using a current path formed by the transistors that are turned on.
Dependencies are inferred from the claim text.