发明名称 |
LOW-VOLTAGE DIFFERENTIAL RECEIVER/TRANSMITTER AND CALIBRATION METHOD THEREOF |
摘要 |
A low-voltage transmitter and receiver adapted for differential signaling via transmission lines between integrated circuits enables operation at very-high data exchange rates. Such data transmission is achieved in a manner that minimizes reflected energy and minimizes crosstalk between signals propagating over neighboring transmission lines. In achieving optimal transmission characteristics, a bridge circuit is employed to drive the signal. The bridge circuit is connected in series between a pull-up and pull-down resistance, their respective resistance values being programmable to maintain optimal communication rates and quality. The pull-up and pull-down resistors preferably comprise a bank of transistors having source-to-drain resistance values that are binary multiples of each other. The transistors are preferably coupled in parallel with each other and in parallel with a resistor, such that the transistors can be selectively activated by a binary voltage control data word. By activating different transistors in the netwwork, different overall resistance values can be achieved. A calibration circuit is provided for periodic calibration of the resistance values to maintain optimal operation with varying system supply voltage and temperature. |
申请公布号 |
WO0239685(A2) |
申请公布日期 |
2002.05.16 |
申请号 |
WO2001US47693 |
申请日期 |
2001.10.26 |
申请人 |
API NETWORKS, INC. |
发明人 |
TALBOT, GERALD;OSBORN, MICHAEL, J.;HUMMEL, MARK, D. |
分类号 |
H04L25/02 |
主分类号 |
H04L25/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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