DEVICES AND METHODS FOR DRIVING A SIGNAL OFF AN INTEGRATED CIRCUIT
First Claim
1. An electronic device including a package, the electronic device comprising:
- at least one externally-accessible terminal configured to couple to a channel; and
an integrated circuit chip, the integrated circuit chip including;
driver circuitry operable to receive an on-chip signal and drive the on-chip signal off of the chip, the driver circuitry having first and second input terminals and first and second output terminals, one of the first and second input terminals coupled to receive the on-chip signal and the other of the first and second input terminals coupled to receive the complement of the on-chip signal, the driver circuitry operable to produce an output signal at the first output terminal and a complement of the output signal at the second output terminal;
a first electrical connector coupled between one of the first or second output terminals and the at least one externally-accessible terminal;
a termination circuit, the termination having an input terminal adjacent to the externally-accessible terminal, the termination operable to terminate a received signal and having an impedance value related to capacitance of the channel; and
a second electrical connector, not coupled to any of the externally-accessible terminals, coupled between the other of the first or second output terminals and the input terminal of the termination circuit.
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Accused Products
Abstract
Embodiments of the present invention provide electronic devices, memory devices and methods of driving an on-chip signal off a chip. In one such embodiment, an on-chip signal and a second signal complementary to the on-chip signal are generated and provided to the two inputs of a differential driver. One output of the differential driver circuitry is coupled to an externally-accessible output terminal of the package. The other output may be terminated off the chip, but within the package. By routing the output signal and a second complementary output through the package, crosstalk potentially caused by the output signal can be reduced. Simultaneous switching output noise may also be reduced through use of a current-steering differential driver topology. Signal symmetry may also improve, reducing inter-symbol interference.
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Citations
25 Claims
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1. An electronic device including a package, the electronic device comprising:
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at least one externally-accessible terminal configured to couple to a channel; and an integrated circuit chip, the integrated circuit chip including; driver circuitry operable to receive an on-chip signal and drive the on-chip signal off of the chip, the driver circuitry having first and second input terminals and first and second output terminals, one of the first and second input terminals coupled to receive the on-chip signal and the other of the first and second input terminals coupled to receive the complement of the on-chip signal, the driver circuitry operable to produce an output signal at the first output terminal and a complement of the output signal at the second output terminal; a first electrical connector coupled between one of the first or second output terminals and the at least one externally-accessible terminal; a termination circuit, the termination having an input terminal adjacent to the externally-accessible terminal, the termination operable to terminate a received signal and having an impedance value related to capacitance of the channel; and a second electrical connector, not coupled to any of the externally-accessible terminals, coupled between the other of the first or second output terminals and the input terminal of the termination circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An electronic device including a package, the electronic conprising:
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at least one externally-accessible terminal; and an integrated circuit chip, the integrated circuit chip including; driver circuitry operable to receive an on-chip signal and drive the on-chip signal off of the chip, the driver circuitry having first and second input terminals and first and second output terminals, one of the first and second input terminals coupled to receive the on-chip signal and the other of the first and second input terminals coupled to receive the complement of the on-chip signal, the driver circuitry operable to produce an output signal at the first output terminal and a complement of the output signal at the second output terminal; a first electrical connector coupled between one of the first or second output terminals and the at least one externally-accessible terminal; a termination circuit, the termination circuit operable to terminate a received signal, the termination circuit not coupled to any of the externally-accessible terminals; a second electrical connector having a length greater than or equal to at least half the length of the first electrical connector coupled between the other of the first or second output terminals and the termination circuit. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A memory device comprising:
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a package having at least one externally-accessible terminal configured to coupled to a channel; an array of memory cells on a substrate within the package; a command decoder operable to receive a command signal and execute the command; an address decoder operable to receive an address request from the command decoder and select a cell within the array of memory cells corresponding to the requested address; an output buffer on the substrate coupled to receive a signal from at least one of the cells in the array of memory cells, the output buffer operable to receive a data signal from the at least one cell and drive the data signal off the substrate, the output buffer comprising; first and second input terminals and first and second output terminals, one of the first and second input terminals coupled to receive the data signal and the other of the first and second input terminals coupled to receive the complement of the data signal, the output buffer operable to produce an output signal at the first output terminal and a complement of the output signal at the second output terminal; a first electrical connector coupled between one of the first or second output terminals and the at least one externally-accessible terminal; a termination circuit inside the package, the termination circuit having an input terminal adjacent to the externally-accessible terminal, but not coupled to any of the externally-accessible terminals, the termination circuit operable to terminate a received signal and having an impedance value related to an impedance of the channel; and a second electrical connector coupled between the other of the first or second output terminals and the input terminal of the termination circuit. - View Dependent Claims (20)
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21. (canceled)
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22. A method of driving an on-chip signal coupled to an externally-accessible terminal, the method comprising:
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receiving an on-chip signal; generating a second signal complementary to the on-chip signal; inputting the on-chip signal and the second complementary signal to a differential amplifier; and generating, with the differential amplifier, a first output signal and a second output signal complementary to the first output signal, wherein; the first output signal is coupled to the externally-accessible terminal off of the chip; and
whereinthe second output signal is coupled to a termination adjacent the externally-accessible terminal and not coupled to an externally-accessible terminal. - View Dependent Claims (23, 24, 25)
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Specification