摘要:
An integrated circuit device 1 such as a current sensor includes a circuit configuration 3 which is driven from supply rails (P1, P2) at a given operational voltage. The integrated circuit device 1 includes control circuitry (R1, T1) responsive to an enabling signal from a micro-controller 2 applied to pin P8 to ensure that data supplied at pin P7 to the micro-controller is at a voltage compatible with a running voltage of the micro-controller 2 that is different from that of the device 1. No pin to receive a rail voltage corresponding to the running voltage for the micro-controller 2 is needed for the integrated circuit device 1.
摘要:
A receiver circuit (16) is programmable to operate with different logic family driver circuits (10). The receiver circuit has two external configuration pins (22,) 24) that are configured to provide the necessary termination for the type of logic family driver circuit used. To terminate the receiver circuit (16) for an ECL application will require first and second configuration pins (22,24) are connected to VCC—2 volts. To terminate the receiver circuit (16) for a CML application will require the first configuration pin (22) and the second configuration pin (24) are connected to VCC. LVDS termination for the receiver circuit (16) requires the first configuration pin (22) and the second configuration pin (24) are connected together. The configuration pins are external to a semiconductor package (14) housing the receiver circuit.
摘要:
An integrated circuit device in which the magnitude of the output voltage swings of outputs in a circuit having emitter coupled output transistors is programmable includes a variable bias generator that produces a bias voltage. The bias voltage is connected to the base of a current source transistor in order to program the magnitude of the output voltage swings. An electrical connection area of the integrated circuit device is connected to the bias voltage generator. An external programming circuit can be connected to the electrical connection area in order to set the bias voltage, to thereby program the desired magnitude of the output voltage swings. The external programming circuit typically can be a resistance or an external voltage source. The variable bias generator can be any of a number of circuits that produce a bias voltage that is dependent upon the external programming circuit connected to the electrical connection area, and that produce a default bias voltage if no external programming circuit is connected to the electrical connection area. Another aspect of the invention is a method for programming the magnitude of the output voltage swings in an integrated circuit device having emitter coupled output transistors. The invention provides the ability to program the magnitude of the output voltage swings of the outputs to increase the magnitude of the output voltage swings, or alternatively, to decrease the magnitude of the output voltage swings thereby advantageously saving power and preventing unnecessary heat generation.
摘要:
Switching between two logic circuits that produce outputs at different respective logic levels is accomplished by means of a common input differential switch that has a branch in each logic circuit. A common current source supplies current to the branches within each logic circuit. The current source remains on regardless of which logic level is selected, thereby enhancing switching speed. The logic circuits produce logic outputs at a common output differential switch, which in turn provides a selected output to a single output terminal. The logic circuits are configured so that the output from the circuit corresponding to the selected logic level dominates the output from the other logic circuit at the output differential switch.
摘要:
A circuit for an electronic device translates logic-low and logic-high voltage levels into other voltage levels suitable for digital intercommunication between the host electronic device and external devices, and between different external devices. The circuit comprises a power supply, a processing module, a communicating module, and a voltage converting module. The power supply provides a first voltage, a second voltage, and a pulse voltage with a predetermined duty cycle. The voltage level converting module converts incoming or outgoing logic voltage levels between a first mode and a second or more modes.
摘要:
Symmetrical, direct coupled laser drivers for high frequency applications. The laser drivers are in integrated circuit form and use a minimum of relatively small (low valued) external components for driving a laser diode coupled to the laser driver through transmission lines. An optional amplifier may be used to fix the voltage at an internal node at data frequency spectrum to improve circuit performance. Feedback to a bias input may also be used to fix the voltage at the internal node. Programmability and a burst mode capability may be included.
摘要:
Driver circuits and methods for operating driver circuits in automatic test equipment are provided. The driver circuit includes an output circuit operable in a dynamic mode and in a termination mode, and a mode control circuit for supplying a first current to the output circuit in the dynamic mode and for supplying a second current to the output circuit in the termination mode in response to a mode select signal. The mode control circuit may include a current multiplier and a switching circuit for switching a control current supplied to the current multiplier. In one example, the slew current supplied to the output circuit is controlled in response to the mode select signal.
摘要:
A selectable receiver includes a first receiver module for receiving first input signal type and a second receiver module, different from the first receiver module, for receiving a second input signal type, both receiver modules coupled to the same receiver inputs. An internal common mode voltage for the first signal type or for the second signal type, is provided by respective common mode voltage networks, to the first or to the second receiver module, to facilitate AC coupling with the appropriate DC common mode voltage required by the signal type. If direct coupled, the internal common mode voltage is effectively swamped out by the common mode voltage of the input signal. The first receiver module or the second receiver module, and the associated first common mode voltage or second common mode voltage, are selected in the receiver based on a control signal. The first receiver module can be a current mode logic (CML) receiver, and the second receiver module can be a low-voltage differential (LVDS) receiver module, e.g., a self-timed interface (STI) receiver module.
摘要:
A variable output voltage swing differential driver including an open-loop current control unit operative to produce a control current, and a voltage output unit receiving the control current and operative to produce a voltage output having a variable output swing. Related apparatus and methods are also disclosed.
摘要:
A driver circuit for use in testing either ECL (emitter-coupled logic) or TTL (transistor-transistor logic) devices. The circuit has a pair of variable reference voltages (V.sub.H,V.sub.L) for determining the logic levels 0 and 1. The circuit also has two termination networks (8,9) for ECL and TTL, which are selectively connected to the output of the driver circuit according to the value of one of the reference voltages (V.sub.L). Preferably the circuit is formed as a hybrid network in which transistors from the same semiconductor slice are mounted on the same ceramic substrate.