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 Title: |
US6760381:
High-voltage differential driver using stacked low-breakdown transistors and nested-miller compensation
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Lu, Crist Y.; Fremont, CA
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| Assignee: |
Centillium Communications Inc., Fremont, CA
other patents from CENTILLIUM COMMUNICATIONS, INC. (771192) (approx. 9)
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| Published / Filed: |
2004-07-06
/ 2001-01-05
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| Application Number: |
US2001000681102
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| IPC Code: |
Advanced:
H04L 25/02;
Core:
more...
IPC-7:
H03F 3/45;
H04B 3/00;
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| ECLA Code: |
H04L25/02K7; H04L25/02K3C;
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| U.S. Class: |
375/257;
330/253;
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| Field of Search: |
375/257,258,288,224
327/333,563,52
330/253,261,252,285,292
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| Priority Number: |
| 2001-01-05 |
US2001000681102 |
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| Abstract: |
An amplifier drives a Digital-Subscriber Line (DSL) using a 12-volt power supply. Ordinary low-voltage transistors for 5-volt systems are stacked together to reduce the average voltage across each transistor to below a breakdown voltage. The output stage uses p-channel and n-channel driver transistors that are coupled to differential outputs through cascode transistors. A common-mode voltage is fed back to a second stage to adjust signals for deviations in the common-mode output bias. A first stage buffers a pair of differential inputs to the second stage. The second stage uses level shifting to generate four signals to the output stage driver transistors. A pair of high-voltage signals drives the p-channel drivers while a pair of low-voltage signals drives the n-channel driver transistors. Nested miller compensation stabilizes the amplifier using capacitors between the final outputs and the four signals from the second stage and the differential signals from the first stage.
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| Attorney, Agent or Firm: |
Auvinen, Stuart T. ;
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| Primary / Asst. Examiners: |
Tran, Khai;
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| INPADOC Legal Status: |
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| Family: |
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First Claim:
Show all 21 claims |
What is claimed is:
1. A line driver comprising:
- an output stage comprising:
- a first p-channel driver transistor, responsive to a first p-differential signal, for conducting current from a power supply;
- a first p-channel cascode transistor coupled to conduct current from the first p-channel driver transistor to a first differential output;
- a first n-channel driver transistor, responsive to a first n-differential signal, for conducting current to a ground;
- a first n-channel cascode transistor coupled to conduct current to the first n-channel driver transistor from the first differential output;
- a second p-channel driver transistor, responsive to a second p-differential signal, for conducting current from the power supply;
- a second p-channel cascode transistor coupled to conduct current from the second p-channel driver transistor to a second differential output;
- a second n-channel driver transistor, responsive to a second n-differential signal, for conducting current to a ground; and
- a second n-channel cascode transistor coupled to conduct current to the second n-channel driver transistor from the second differential output;
- wherein the first p-differential signal is a small-signal complement of the second p-differential signal wherein when the first p-differential signal rises, the second p-differential signal falls;
- wherein the first n-differential signal is a small-signal complement of the second n-differential signal wherein when the first n-differential signal rises, the second n-differential signal falls;
- wherein the power supply has a power-supply voltage greater than 6 volts and wherein transistors have breakdown voltages that are less than the power-supply voltage;
- whereby four differential signals control driver transistors connected to differential outputs through cascode transistors.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 3 U.S. patent(s) that reference this one
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