EP0264933A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
System employing negative feedback for decreasing the response time of a memory cell
Assignee: Mindspeed Technologies LLC
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Filing: 1987-10-21
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Granted: —
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Expires: 2007-10-21
Abstract
Abstract irst and second lines respectively receive first and second complementary input signals representing a binary bit. Each of the input signals has first and second logic levels respectively corresponding to a binary "1" and a binary "0". The input signals produce a current through a load in accordance with the relative logic levels of the first and second input signals. The difference between the logic levels of the input signals is amplified and introduced as a negative feedback to a particular one of the first and second lines in accordance with the relative logic levels of the signals on the lines. The feedback causes a current to be produced in the load with a polarity opposite to the polarity of the current produced in the load by the input signals and with a magnitude less than the magnitude of the current produced in the load by the input signals. The negative feedback is effective in minimizing the time for the load to respond to changes in the relative logic levels of the first and second input signals. In this way, the frequency of response to a system including the circuitry of this invention can be significantly increased. The embodiment described above may the used in a system in which first particular input signals are provided to identify a selected word and second particular input signals are provided to iden- itify a bit in the word one and in which a cell (a load) is selected common to the selected word and the selected bit. The circuitry described above may be included to minimize the time for producing in the load a signal representative of the selection of such cell.
Inventors
- 👤 Michael J. Brunolli
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 03:15
CPC Classifications
G; G11; G11C; G11C7/00; G11C7/06; G11C7/062
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
200 words
A negative feedback system, comprising: a first line (10) a second line (12) means (14) for providing a first binary input signal (BL) having first and second logic levels and a second binary input signal ( BL) having second and first logic levels at the same time as the respective occurrence of the first and second logic levels in the first binary input signal (BL), the first and second binary input signals (BL, BL) coding for a binary bit on a complementary basis, means for introducing the first binary input signal (BL) to the first line (10), means for introducing the second binary input signal ( BL) to the second line (12), means (16) for amplifying and inverting the difference in the logic levels of the first and second input signals (BL, BL), and means (18) responsive to the output from the amplifier means (16,20,22) for feeding such output back to an individual one of the first and second lines (10,12) where the logic level of the binary input signal (BL; BL) on such individual line (10;12) has a particular imbalance relative to the logic level of the binary signal ( BL;BL) on the other one (12;10) of the lines.
Claim 2
Dependent Claim
200 words
A negative feedback system, comprising: a first line (10) a second line (12) means (14) for providing a first binary input signal (BL) having first and second logic levels and a second binary input signal ( BL) having second and first logic levels at the same time as the respective occurrence of the first and second logic levels in the first binary input signal (BL), the first and second binary input signals (BL, BL) coding for a binary bit on a complementary basis, means for introducing the first binary input signal (BL) to the first line (10), means for introducing the second binary input signal ( BL) to the second line (12), means (16) for amplifying and inverting the difference in the logic levels of the first and second input signals (BL, BL), and means (18) responsive to the output from the amplifier means (16,20,22) for feeding such output back to an individual one of the first and second lines (10,12) where the logic level of the binary input signal (BL; BL) on such individual line (10;12) has a particular imbalance relative to the logic level of the binary signal ( BL;BL) on the other one (12;10) of the lines.
Claim 3
Dependent Claim
68 words
A system as set forth in claim 1, means (20,22) associated with the first and second lines (10,12) for producing a current through the other one (12) of the first and second lines when the logic level of the input signal (BL) on the individual line (10) has the particular imbalance relative to the logic level of the binary input signal ( BL) on the other line (12).
Claim 4
Dependent Claim
40 words
A system as set forth in claim 2, the feedback means (18,20,22) being constructed to provide a feedback current of a smaller amplitude to the individual line (10) than the amplitude of the current flowing through the other line (12).
Claim 5
Dependent Claim
154 words
A negative feedback system, comprising: means (118) for providing first and second complementary input signal (BL, BL) each having first and second logic levels, a pair of lines (10,12) respectively connected to receive the first and second complementary input signals (BL, BL), means connected to the first and second lines (114,116) for producing a current through an individual one (10) of the lines in accordance with the relative logic levels of the first and second com- piementacy input signals (BL, BL), means (120,122,128,130,134) responsive to the first and second complementary input siganls (BI, BL) for producing a signal representing the inversion of the logic level of the first input signal (BL) relative to the logic level of the second input signal ( BL), and means (136,138.) responsive to the inverted signal for introducing the inverted signal (by 134) to the other one (102) of the first and second lines than the individual line (100).
Claim 6
Dependent Claim
154 words
A negative feedback system, comprising: means (118) for providing first and second complementary input signal (BL, BL) each having first and second logic levels, a pair of lines (10,12) respectively connected to receive the first and second complementary input signals (BL, BL), means connected to the first and second lines (114,116) for producing a current through an individual one (10) of the lines in accordance with the relative logic levels of the first and second com- piementacy input signals (BL, BL), means (120,122,128,130,134) responsive to the first and second complementary input siganls (BI, BL) for producing a signal representing the inversion of the logic level of the first input signal (BL) relative to the logic level of the second input signal ( BL), and means (136,138.) responsive to the inverted signal for introducing the inverted signal (by 134) to the other one (102) of the first and second lines than the individual line (100).
Claim 7
Dependent Claim
38 words
A system as set forth in claim 4, means (114,116, 136,138) for providing the inverted signal with characteristics to provide the inverted signal with a lower amplitude than the signal on the individual one (100) of the lines.
Claim 8
Dependent Claim
55 words
A system as set forth in claim 5, the feedback means (136,138) being constructed to introduce a current to the other line (102) of the same polarity as that produced in the other line upon an inversion in the relative magnitudes of the logic levels of the first and second complementary input signals (BL, BL).
Claim 9
Dependent Claim
96 words
A negative feedback system, as set forth in any one of the preceding claims, comprising, a load (108,110), means (114,116,cell) responsive to the relative logic levels of the signals on the first and second lines (100,102) for producing through the load (108,110) a current representative of the value of the binary bit of information, means (120,122,128,130,134) responsive to the signal output by the feedback means (136,138) for producing an acceleration in the time of response of the load to a change in the relative logic levels of the first and second complementary input signals (BL, BL).
Claim 10
Dependent Claim
45 words
A system as set forth in claim 7, the accelerating means producing an increase in the slope of the change of the relative logic levels of the first and second complementary input signals (BL, BL) on the first and second complementary input lines (100, 102).
Claim 11
Dependent Claim
58 words
A system as set forth in claim 7, the acceleration means providing a shortening of the time at which the logic levels of the signals on the first and second input lines starts to change in response to the introduction to the lines of the change in the relative logic levels of the first and second input signals
Claim 12
Independent Claim
27 words
A system as set forth in any one of the preceding claims wherein said feedback is produced to at least a particular one of the lines (100,102)
Claim 13
Independent Claim
171 words
A system as set forth in any one of the preceding claims, comprising: means (104) for providing a third signal having logic levels respectively coding for true and false states of a particular word, a cell (118) defined by a coincidence of the particular binary bit and the particular word, means (114,116) for activating the cell (118), in accordance with a coincidence in the occurrence of the signals coding for a true state in the particular word and the particular bit, to produce a particular current through the cell (118), said feedback means being responsive to the first and second signals for producing a negative feedback signal, and means (114,116) responsive to the negative feedback signal for producing a current through the cell (118) in a direction opposite to the flow of the particular current through the cell (118) to decrease the time for the cell to respond to the production of the logic levels coding in the first and second signals for the false state of the particular binary bit.
Claim 14
Dependent Claim
56 words
A system as set forth in claim 11, the means responsive to the negative feedback including switching means (114,116) for producing a flow of current through the cell (118) with a polarity opposite to, and a magnitude less than, that produced in the cell by the first and second signals and the third and fourth signals.
Claim 15
Dependent Claim
89 words
A system as set forth in claim 11, the means (136,138) producing the negative feedback signal including means (108,110) responsive to the current through the cell for converting this current to a voltage representative of such current, and means including switching means responsive to the voltage produced by the last mentioned means (120,122, 128,130,134,136,138) for producing a flow of current through the cell (118) with a polarity opposite to, and a magnitude less than, that produced in the cell by the first and second signals and the third signal.
Claim 16
Dependent Claim
201 words
A negative feedback system, comprising: first and second complementary input lines (100,102), means for respectively introducing first and second complementary input signals to the first and second lines, the first and second input signals being complementary in the relative production of first and second logic levels and being complementary in indicating the value of a binary bit of information in a word, a third complementary line (104) means for respectively introducing third and fourth complementary input signals (W.L.) to the third line, the third and fourth input signals being complementary in the relative production of the first and second logic levels and being complementary in indicating a word, a load, means (114,116) responsive to the concurrence of the first logic levels of the signals on the first and third lines for producing a current through the load, means (120,122,128,130,134) responsive to the logic levels of the signals on the first and second lines for producing a feedback signal having characteristics dependent upon such relative logic levels, and means (136,138,100,102) responsive to the feedback signal to minimize the time for the load means to respond to a change in the relative logic levels of the signals on the first and second lines.
Claim 17
Dependent Claim
201 words
A negative feedback system, comprising: first and second complementary input lines (100,102), means for respectively introducing first and second complementary input signals to the first and second lines, the first and second input signals being complementary in the relative production of first and second logic levels and being complementary in indicating the value of a binary bit of information in a word, a third complementary line (104) means for respectively introducing third and fourth complementary input signals (W.L.) to the third line, the third and fourth input signals being complementary in the relative production of the first and second logic levels and being complementary in indicating a word, a load, means (114,116) responsive to the concurrence of the first logic levels of the signals on the first and third lines for producing a current through the load, means (120,122,128,130,134) responsive to the logic levels of the signals on the first and second lines for producing a feedback signal having characteristics dependent upon such relative logic levels, and means (136,138,100,102) responsive to the feedback signal to minimize the time for the load means to respond to a change in the relative logic levels of the signals on the first and second lines.
Claim 18
Dependent Claim
44 words
A system as set forth in claim 14 wherein the feedback means provides a negative feedback and the time-minimizing means introduces to the load a current opposite in polarity to and having a magnitude less than that of, the current produced in the load.
Claim 19
Dependent Claim
40 words
A system as set forth in claim 15, wherein the time-minimizing means is operative to accelerate the time in which the load responds to a change in the relative logic levels of the signals on the first and second lines.
Claim 20
Dependent Claim
65 words
A system as set forth in claim 15, wherein the feedback means and the time-minimizing means co-operate to produce, in response to changes in the logic levels of the first and second signals, faster and stronger changes in the logic levels of the signals in the first and second lines than would be produced if the feedback means and the time-minimizing means were not included.
References Cited (Backward Citations)
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