Abstract:
The invention relates to an interfacing device for pseudo-differential transmission through interconnections used for sending a plurality of electrical signals. The interfacing device of the invention comprises signal terminals (101) and a common terminal ( 100). A transmitting circuit (5) receives the 'input signals of the transmitting circuit' coming from a source (2). The output of the transmitting circuit (5) delivers, when the transmitting circuit is in the activated state, voltages between one of said signal terminals (101) and said common terminal (100). A receiving circuit (6) delivers, when the receiving circuit is in the activated state, 'output signals of the receiving circuit' determined each by the voltage between one of said signal terminals (101) and said common terminal (100), to the destination (3). The balancing circuit (9) is such that, when the transmitting circuit is in the activated state, the current flowing out of the common terminal (100) approximates the opposite of the sum of the currents flowing out of the signal terminals (101).
Abstract:
A data communication system comprises a transmission line between first and second integrated circuits. An encoder on the first integrated circuit encodes an input data stream to produce a sequence of codewords, wherein codewords in the sequence are members of a set of codewords representing data in the input data stream, and the members of the set are substantially DC balanced, such as a Manchester encoded symbol set. An integrating circuit on the second integrated circuit integrates codewords by integrating for a first interval with a positive polarity within a particular symbol cell, and integrating for a second interval with a negative polarity within the particular symbol cell, to produce output representing the codewords. A sense circuit produces an output data stream.
Abstract:
Systems and methods for providing offset calibration for low power and high performance receivers are described herein. In one embodiment, a method for offset calibration comprises inputting a first voltage to a first input of a sample latch, and inputting a second voltage and an offset-cancelation voltage to a second input of the sample latch. The method also comprises adjusting the offset-cancelation voltage, observing an output of the sample latch as the offset-cancelation voltage is adjusted, and recording a value of the offset-cancelation voltage at which a metastable state (toggles between one and zero) is observed at the output of the sample latch. The method may be performed for each one of a plurality of different voltage levels for the first voltage to determine an offset-cancelation voltage for each one of the voltage levels.
Abstract:
A data communication system comprises a transmission line between first and second integrated circuits. An encoder on the first integrated circuit encodes an input data stream to produce a sequence of codewords, wherein codewords in the sequence are members of a set of codewords representing data in the input data stream, and the members of the set are substantially DC balanced, such as a Manchester encoded symbol set. An integrating circuit on the second integrated circuit integrates codewords by integrating for a first interval with a positive polarity within a particular symbol cell, and integrating for a second interval with a negative polarity within the particular symbol cell, to produce output representing the codewords. A sense circuit produces an output data stream.
Abstract:
The invention relates to a receiver for a differential bus with a switch control logic (151), with two branches with resistive elements (7, 61...70, 8 and 5, 11...20, 6) and with switches (3, 80) for switching the resistive elements, in which the switch control logic sets the switches - in a first routine for determining the absolute level of signals on the bus by applying a common mode voltage to the bus, by comparing the voltage on a first resistive branch with a reference voltage, by selecting the correct switch settings, and by writing these settings to an internal storage device, - and in a second routine for minimizing the mismatch between the two resistive branches by applying a common mode voltage to the bus, by comparing the voltage of the second resistive branch with that of the already trimmed first resistive branch, by selecting the correct switch settings for the second branch, and by writing these settings to an internal storage device. The receiver therefore provides good balancing and common mode rejection.
Abstract:
L'invention est relative àune interface de communication, comprenant une borne d'entrée (Rx) conçue pour recevoir un signal logique d'une interface distante (IF2); un discriminateur de niveaux logiques (12) couplé à la borne d'entrée; un détecteur de crête (14) connecté pour mémoriser la valeur crête du signal sur la borne d'entrée; et un suiveur de tension (16) connecté pour fournir au discriminateur une tension d'alimentation auxiliaire (Vdd2') basée sur la valeur fournie par le détecteur de crête. L'interface inclut un dispositif de protection contre les décharges électrostatiques, comprenant une première diode (D1)et un circuit RC formant le détecteur de crête, connectés en série entre la borne d'entrée (Rx) et une première ligne d'alimentation (Vss1); un transistor (MN1) connecté entre la première ligne d'alimentation (Vss1) et la borne d'entrée (Rx) par la première diode (D1); et un inverseur (42) configuré pour rendre conducteur le transistor lorsque la tension aux bornes du condensateur du circuit RC est inférieure à un seuil.
Abstract:
A single receive chain of a MIMO receiver is activated during a low power listen mode. Upon detecting a legacy short training field (L-STF) in a received packet, the single receive chain performs a first frequency estimation, and activates one or more additional receive chains of the MIMO receiver. The MIMO receiver uses maximal ratio combining (MRC) to receive the signal using the first receive chain and the one or more additional activated receive chains, wherein the MRC is based, at least in part, on the first frequency estimation. The MIMO receiver may determine whether the received packet is a high throughput/very high throughput (HT/VHT) packet, and if not, deactivate the one or more additional receive chains. In one alternative, the additional receive chains are not activated until determining that a HT/VHT packet has been received.
Abstract:
Interface circuitry and method for transmitting and receiving downstream and upstream data signals simultaneously via a common conductor pair. The composite signal containing the downstream and upstream data signal components being conveyed by the common conductor pair is isolated, e.g., via signal filtering or buffering, and combined with an appropriately scaled inverse replica of the outgoing upstream data signal to subtract out upstream data signal components and thereby provide the downstream data signal substantially free of any upstream data signal components.
Abstract:
Described is an apparatus which comprises: an amplifier; and a passive continuous-time linear equalizer integrated with a baseline wander (BLW) corrector, wherein the integrated equalizer and BLW corrector is coupled to the amplifier.