Reference voltage generation for single-ended communication channels
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G05F-003/04
G05F-003/16
출원번호
US-0359299
(2009-01-24)
등록번호
US-8564274
(2013-10-22)
발명자
/ 주소
Dimitriu, Dragos
Hollis, Timothy M.
출원인 / 주소
Micron Technology, Inc.
대리인 / 주소
Schwegman, Lundberg & Woessner, P.A.
인용정보
피인용 횟수 :
1인용 특허 :
15
초록▼
An improved reference voltage (Vref) generator useable, for example, in sensing data on single-ended channels is disclosed. The Vref generator can be placed on the integrated circuit containing the receivers, or may be placed off chip. In one embodiment, the Vref generator comprises an adjustable-re
An improved reference voltage (Vref) generator useable, for example, in sensing data on single-ended channels is disclosed. The Vref generator can be placed on the integrated circuit containing the receivers, or may be placed off chip. In one embodiment, the Vref generator comprises an adjustable-resistance voltage divider in combination with a current source. The voltage divider is referenced to I/O power supplies Vddq and Vssq, with Vref being generated at a node intervening between the adjustable resistances of the voltage divider. The current source injects a current into the Vref node and into a non-varying Thevenin equivalent resistance formed of the same resistors used in the voltage divider. So constructed, the voltage generated equals the sum of two terms: a first term comprising the slope between Vref and Vddq, and a second term comprising a Vref offset. Each of these terms can be independently adjusted in first and second modes: the slope term via the voltage divider, and the offset term by the magnitude of the injected current. Use of the disclosed Vref generator in one useful implementation allows Vref to be optimized at two different values for Vddq.
대표청구항▼
1. A reference voltage generator to generate a reference voltage at a node, the reference voltage generator comprising: a plurality of adjustable resistances including a first adjustable resistance and a second adjustable resistance, one end of each of the first and second adjustable resistances cou
1. A reference voltage generator to generate a reference voltage at a node, the reference voltage generator comprising: a plurality of adjustable resistances including a first adjustable resistance and a second adjustable resistance, one end of each of the first and second adjustable resistances coupled to the node, the other end of each of the first and second adjustable resistances being selectively coupleable to either a first power supply voltage or a second power supply voltage based on a control signal; andan adjustable current source to inject a current into the node,a change in a magnitude of the current to result in a change in the magnitude of the reference voltage, andthe magnitude of the reference voltage at the node to be between the magnitude of the first power supply voltage and the magnitude of the second power supply voltage. 2. The reference voltage generator of claim 1, wherein the other end of each of the first and second adjustable resistances is selectively coupleable by a first transistor and a second transistor, the control signal being configured to be received at gates of the first and second transistors concurrently. 3. The reference voltage generator of claim 1, wherein the adjustable current source comprises a positive current source and a negative current source for respectively adding to and subtracting from the current injected into the node. 4. The reference voltage generator of claim 1, wherein the current is to can be coarsely and finely adjusted by the adjustable current source. 5. The reference voltage generator of claim 1, wherein the adjustable current source comprises at least one current mirror. 6. The reference voltage generator of claim 1, wherein the adjustable current source is to adjust the magnitude of the reference voltage independently of the magnitudes of the first power supply voltage and the second power supply voltage. 7. The reference voltage generator of claim 1, wherein the first and second adjustable resistances are to adjust the magnitude of the reference voltage relative to the magnitudes of the first power supply voltage or the second power supply voltage. 8. A reference voltage generator to generate a reference voltage at a node, the reference voltage generator comprising: an adjustable current source to inject a current into the node; anda resistance stage comprising a plurality of resistances each coupled at one end to the node, the other end of the plurality of resistances controllable to be selectively coupled to either a first power supply or a second power supply based on a control signal. 9. The reference voltage generator of claim 8, wherein the adjustable current source is not to be powered by either the first or second power supplies. 10. The reference voltage generator of claim 8, wherein the resistance stage is to vary the reference voltage at the node depending on which resistances are controlled to be coupled to the first or second power supplies. 11. The reference voltage generator of claim 10, wherein the resistance stage is to vary the reference voltage in proportion to the first or second power supply. 12. The reference voltage generator of claim 8, wherein the adjustable current source is to inject a positive or negative current into the node to adjust the reference voltage at the node. 13. The reference voltage generator of claim 8, wherein the resistance stage comprises a Thevenin equivalent resistive load for the adjustable current source of which equivalent resistance is not to vary depending on which of the plurality of resistances are controlled to be coupled to the first or second power supplies. 14. A reference voltage generator to generate a reference voltage at a node, the reference voltage generator comprising: an adjustable current source to inject an adjustable current into the node; andan adjustable voltage divider comprising a plurality of resistances each coupled at one end to the node, the other end of the plurality or resistances controllable to be selectively coupled to either a first power supply voltage or a second power supply voltage,the adjustable voltage divider to adjust the reference voltage relative to the first or second power supply voltage, the adjustable current to adjust the reference voltage independent of the first and second power supply voltages. 15. The reference voltage generator of claim 14, wherein the first power supply voltage is coupled to the adjustable voltage divider. 16. The reference voltage generator of claim 14, wherein the first power supply voltage is not coupled to the adjustable current source. 17. The reference voltage generator of claim 14, wherein the adjustable current is to be adjusted based at least in part on selecting at least one of a plurality of current mirror legs. 18. The reference voltage generator of claim 14, wherein the adjustable voltage divider comprises an adjustable resistance between the node and the first or the second power supply voltage. 19. The reference voltage generator of claim 14, wherein the plurality of resistances comprise a plurality of resistors. 20. The reference voltage generator of claim 14, wherein the plurality of resistances comprise a plurality of transistors. 21. A receiver, comprising: an amplifier having a first input to receive data from a communication channel comprising a plurality of resistances each coupled at one end to a same node, the data to be referenced to at least one of a high power supply voltage and a low power supply voltage, the amplifier further having a second input to receive a reference voltage, and at least one output to provide an outcome of comparison of a voltage of the data to the reference voltage,the reference voltage being adjustable in first and second modes, the first mode is to adjust the reference voltage relative to at least one of the high or low power supply voltages, the adjusting of the reference voltage comprising selectively coupling the other end of a corresponding one of the plurality of resistances to either the high power supply voltage or the low power supply voltage based on a control signal, the second mode is to adjust the reference voltage independently of the high or low power supply voltages. 22. The receiver of claim 21, wherein the communication channel is external to an integrated circuit including the receiver. 23. The receiver of claim 21, wherein the second mode is to adjust the reference voltage up or down based at least in part on by adding to or subtracting from a current injected into the same node having the reference voltage. 24. The receiver of claim 23, wherein the current is to be coarsely and finely adjusted in the second mode. 25. A method of producing a reference voltage, the method comprising: determining, for a signal to be sensed, a relationship between the reference voltage and a power supply voltage;applying, as the power supply voltage, at least one power supply voltage to a reference voltage generator; andprogramming the reference voltage generator to produce at a reference voltage node a reference voltage value configured to vary with the at least one power supply voltage applied in accordance with the relationship, the reference voltage node comprising a center point in a voltage divider, programming the reference voltage generator comprises adjusting a current delivered to the reference voltage node, and adjusting resistance in the voltage divider via at least one control signal, wherein the at least one power supply voltage comprises a first power supply voltage and a second power supply voltage, wherein the adjusting of the resistance in the voltage divider comprises adjusting a first resistance between the reference voltage node and the first power supply voltage, or adjusting a second resistance between the reference voltage node and the second power supply voltage, or both. 26. The method of claim 25, wherein the adjusting of the current is to raise or lower the reference voltage value. 27. The method of claim 26, wherein the current is independent of the at least one power supply voltage. 28. The method of claim 26, wherein an amount the reference voltage value to be raised or lowered by is independent of the at least one power supply voltage.
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