Abstract: A single-inductor power converter with buck-boost capability provides regulated bipolar output voltage to a positive and a negative load. A five-switch bridge topology allows a controller to direct the inductor current to the appropriate outputs or circuit ground as needed to maintain regulation. The controller also adjusts the inductor current level for proper output voltage regulation. The five-switch bridge topology makes possible a wide range of ratios between the positive and negative output currents of the converter.

Abstract: A monolithic capacitance multiplication circuit serves to reduce the required die area when larger capacitance values are needed such as in filter and loop frequency compensation circuits. A current mirror/cascoding device arrangement reduces the effective series resistance of the multiplier capacitor. As a result, the multiplier topology exhibits improved bandwidth over prior art capacitance multiplier circuits.

Abstract: A monolithic capacitance multiplication circuit serves to reduce the required die area when larger capacitance values are needed such as in filter and loop frequency compensation circuits. A current mirror/cascoding device arrangement reduces the effective series resistance of the multiplier capacitor. As a result, the multiplier topology exhibits improved bandwidth over prior art capacitance multiplier circuits.

Abstract: High voltage and low voltage switch mode circuits and methods serve to recover the charge stored on electro-luminescent lamp panels that would otherwise be dissipated during the discharge cycle of a drive circuit. The high voltage circuits and methods operate to transfer the charge to the high voltage rail, while the low voltage circuits and methods operate to transfer the charge to the source of low drive voltage.

Abstract: A receiver circuit (30) for a contactless identification system, includes an antenna (32). The antenna (32) receives an amplitude modulated signal. A voltage envelope detector (34) is connected to the antenna (32). A current envelope detector (36) is connected to the antenna (32). A first comparator (38) has a first input (40) connected to an output of the voltage envelope detector (34) and a second input (42) connected to a threshold. A second comparator (44) has a first input (46) connected to an output of the current envelope detector (36) and a second input (48) connected to the threshold. A logic gate (50) combines an output (52) of the first comparator (38) and an output (54) of the second comparator (44).

Abstract: A receiver circuit (30) for a contactless identification system, includes an antenna (32). The antenna (32) receives an amplitude modulated signal. A voltage envelope detector (34) is connected to the antenna (32). A current envelope detector (36) is connected to the antenna (32). A first comparator (38) has a first input (40) connected to an output of the voltage envelope detector (34) and a second input (42) connected to a threshold. A second comparator (44) has a first input (46) connected to an output of the current envelope detector (36) and a second input (48) connected to the threshold. A logic gate (50) combines an output (52) of the first comparator (38) and an output (54) of the second comparator (44).

Abstract: High voltage and low voltage switch mode circuits and methods serve to recover the charge stored on electro-luminescent lamp panels that would otherwise be dissipated during the discharge cycle of a drive circuit. The high voltage circuits and methods operate to transfer the charge to the high voltage rail, while the low voltage circuits and methods operate to transfer the charge to the source of low drive voltage.

Abstract: High voltage and low voltage switch mode circuits and methods serve to recover the charge stored on electro-luminescent lamp panels that would otherwise be dissipated during the discharge cycle of a drive circuit. The high voltage circuits and methods operate to transfer the charge to the high voltage rail, while the low voltage circuits and methods operate to transfer the charge to the source of low drive voltage.

Abstract: High voltage and low voltage switch mode circuits and methods serve to recover the charge stored on electro-luminescent lamp panels that would otherwise be dissipated during the discharge cycle of a drive circuit. The high voltage circuits and methods operate to transfer the charge to the high voltage rail, while the low voltage circuits and methods operate to transfer the charge to the source of low drive voltage.