Abstract:
Aspects of the present invention include a method, apparatus and device for generating a power on reset (POR) signal in relation to the crossing point of two currents wherein at least one current is a quadratic function and the other is a logarithmic function, where each has a mathematical correlation to a function of the power supply voltage.
Abstract:
An Inverting hysteretic transistor switch having an input terminal (13), an output terminal (17) and a ground terminal (15) includes, in some embodiments (11), a metal-oxide semiconductor field effect transistor (MOSFET) having an on switching state and an off switching state. The MOSFET includes a drain terminal connected to the output terminal, a gate terminal and a source terminal connected to the ground terminal. The switch further includes a hysteresis circuit (12) connected to the input terminal and to the gate terminal of the MOSFET. In use, with an input voltage having low-to-high and high-to-low input voltage transitions applied to the input terminal, the hysteresis circuit switches the MOSFET to its on switching state at a first threshold voltage during low-to-high input voltage transitions. In addition, the hysteresis circuit switches the MOSFET to its off switching state at a second threshold voltage, which is less than the first threshold voltage, during high-to-low input voltage transitions.
Abstract:
An ADSL/POTS filter includes a switchable impedance (220) which is inserted on the low frequency side of filter (2, 3, 5, 6, 7). The impedance is switched by switch (209) which is controlled by a line sensor so that the impedance is switched into the circuit when the telephone (44) goes off-hook.
Abstract:
A switching device (2) comprises a plurality of switching means (4) connected in series by input conductor (12) to an input terminal (8). A plurality of respective load means (6) are connected between the switching means (4) and an output terminal (10). Each of the switching means (4) is adapted to selectively activate the respective load means (6) by connecting it to the input terminal (8) in response to a corresponding voltage level applied to the input terminal (8).
Abstract:
A programmable switching transistor circuit has at least one pair of semi-conductor devices (12, 14) of opposite types, e.g., pnp and npn types, interconnected with the gate terminal of the first device (12) connected to the anode terminal of the second device (14). The cathode terminal of the first device (12) is connected to a control terminal (G). A voltage dependant switch (15), such as a zenner diode, is connected between the control terminal (G) and the gate terminal of the second device whereby the circuit becomes voltage controlled for "on" and "off" switching in accordance with external circuit parameters and the voltage value of the switch (15).
Abstract:
Es wird eine Inverterschaltung (80) beschrieben, welche ein erstes und ein zweites Schaltmittel (1, 2) umfasst, welche in einem elektrischen Pfad (10) zueinander in Reihe und zu einem Zwischenkreiskondensator (20) parallel geschaltet sind. Die Inverterschaltung (80) umfasst ferner einen Ausgang (9) und zwei Eingänge (11, 12), welche jeweils elektrisch leitfähig mit einem Pol des Zwischenkreiskondensators (20) verbunden und mit jeweils einem Pol eines Energiespeichers verbindbar sind. Des Weiteren weist die Inverterschaltung (80) ein Spannungsbegrenzungselement (30) auf, welches mit einem ersten Anschluss zwischen den beiden Schaltmitteln (1, 2) mit dem elektrischen Pfad (10) und mit einem zweiten Anschluss mit dem Steueranschluss (3) des zweiten Schaltmittels (2) elektrisch leitfähig verbunden ist. Erfindungsgemäß ist ein Kondensator (40) in der elektrisch leitfähigen Verbindung zwischen dem Spannungsbegrenzungselement (30) und dem Steueranschluss (3) des zweiten Schaltmittels (2) angeordnet und eine Referenzspannungsquelle (50) elektrisch leitfähig mit dem ersten Anschluss des Spannungsbegrenzungselementes (30) verbunden.
Abstract:
A population of drivers is provided in parallel to a driver output and a population of pre-emphasis path drivers is provided in parallel to the driver output. The population of drivers is updated and the population of pre-emphasis path drivers is updated in an inverse relation to the updating of the population of pre-emphasis path drivers. Optionally, the population of drivers has an initial value of n and the population of pre-emphasis path drivers has an initial value of m, and the sum of n and m is P. Optionally, the updated population of n is n' and the updated population of m is m', and n' is approximately equal to P - m'.