Abstract: In some aspects, the disclosure is directed to methods and systems for providing voltage regulation and transient suppression from a battery to an integrated circuit. A resistor between a source power supply and the integrated circuit may dissipate power and reduce the voltage at the integrated circuit's input, with current through the resistor under control of an internal regulator of the integrated circuit.

Abstract: A system for controlling the impact of process and temperature in passive signal detector includes a voltage level detector, a first transistor with a drain electrically connected to a first input of the voltage level detector, and a second transistor with a drain electrically connected to a second input of the voltage level detector. The first transistor has a threshold voltage of a first voltage value. The threshold voltage corresponds to a minimum gate-to-source voltage to create a conducting path between source and drain terminals of a transistor. The second transistor has a threshold voltage of the first voltage value. An offset voltage is applied across a gate of the first transistor and a source of the second transistor, and applied across a gate of the second transistor and a source of the first transistor. A difference between a threshold voltage and the offset voltage is constant.

Abstract: In some aspects, the disclosure is directed to methods and systems for providing voltage regulation and transient suppression from a battery to an integrated circuit. A resistor between a source power supply and the integrated circuit may dissipate power and reduce the voltage at the integrated circuit's input, with current through the resistor under control of an internal regulator of the integrated circuit.

Abstract: A system for controlling the impact of process and temperature in passive signal detector includes a voltage level detector, a first transistor with a drain electrically connected to a first input of the voltage level detector, and a second transistor with a drain electrically connected to a second input of the voltage level detector. The first transistor has a threshold voltage of a first voltage value. The threshold voltage corresponds to a minimum gate-to-source voltage to create a conducting path between source and drain terminals of a transistor. The second transistor has a threshold voltage of the first voltage value. An offset voltage is applied across a gate of the first transistor and a source of the second transistor, and applied across a gate of the second transistor and a source of the first transistor. A difference between a threshold voltage and the offset voltage is constant.

Abstract: An output discharge circuit for a load switch may include a capacitor coupled between a power rail of the output discharge circuit and a ground lead, and a diode coupled between a power input of the output discharge circuit and the power rail. The output discharge circuit may charge the capacitor via a current path formed by the diode while power is being supplied to the load switch. When the power supply to the output discharge circuit is turned off, the diode may prevent the capacitor from discharging through the current path, and the stored charge on the capacitor may be used to power the output discharge switch for a period of time after the power supply has been turned off. In this way, the output discharge circuit may continue to discharge the output of the load switch even when power is no longer being supplied to the load switch.

Abstract: This disclosure describes techniques for generating relatively low regulated power supply voltages over a relatively wide range of input voltages. The techniques for generating the regulated voltages may include using at least two different pass transistors to regulate an output voltage of a voltage regulator. Both the turn-on threshold voltage and the maximum drain-to-source voltage rating of the first pass transistor may be greater than the corresponding characteristics of the second pass transistor. Using two different pass transistors with two different turn-on threshold voltages and two different maximum drain-to-source voltage ratings may increase the range of voltages over which a voltage regulator can generate a relatively low output voltage relative to the range of voltages that would be allowable if a single type of pass transistor were used.

Abstract: An output discharge circuit for a load switch may include a capacitor coupled between a power rail of the output discharge circuit and a ground lead, and a diode coupled between a power input of the output discharge circuit and the power rail. The output discharge circuit may charge the capacitor via a current path formed by the diode while power is being supplied to the load switch. When the power supply to the output discharge circuit is turned off, the diode may prevent the capacitor from discharging through the current path, and the stored charge on the capacitor may be used to power the output discharge switch for a period of time after the power supply has been turned off. In this way, the output discharge circuit may continue to discharge the output of the load switch even when power is no longer being supplied to the load switch.

Abstract: An output discharge circuit for a load switch may include a capacitor coupled between a power rail of the output discharge circuit and a ground lead, and a diode coupled between a power input of the output discharge circuit and the power rail. The output discharge circuit may charge the capacitor via a current path formed by the diode while power is being supplied to the load switch. When the power supply to the output discharge circuit is turned off, the diode may prevent the capacitor from discharging through the current path, and the stored charge on the capacitor may be used to power the output discharge switch for a period of time after the power supply has been turned off. In this way, the output discharge circuit may continue to discharge the output of the load switch even when power is no longer being supplied to the load switch.

Abstract: An output discharge circuit for a load switch may include a capacitor coupled between a power rail of the output discharge circuit and a ground lead, and a diode coupled between a power input of the output discharge circuit and the power rail. The output discharge circuit may charge the capacitor via a current path formed by the diode while power is being supplied to the load switch. When the power supply to the output discharge circuit is turned off, the diode may prevent the capacitor from discharging through the current path, and the stored charge on the capacitor may be used to power the output discharge switch for a period of time after the power supply has been turned off. In this way, the output discharge circuit may continue to discharge the output of the load switch even when power is no longer being supplied to the load switch.

Abstract: A voltage feedback loop employed with a power distribution switch rapidly responds to a predetermined drop in output voltage to increase the resistance of the switch for a predetermined time. After this predetermined time, a current feedback loop controls the resistance until the output voltage recovers, while also isolating the voltage feedback loop from the switch.

Abstract: This disclosure describes techniques for generating relatively low regulated power supply voltages over a relatively wide range of input voltages. The techniques for generating the regulated voltages may include using at least two different pass transistors to regulate an output voltage of a voltage regulator. Both the turn-on threshold voltage and the maximum drain-to-source voltage rating of the first pass transistor may be greater than the corresponding characteristics of the second pass transistor. Using two different pass transistors with two different turn-on threshold voltages and two different maximum drain-to-source voltage ratings may increase the range of voltages over which a voltage regulator can generate a relatively low output voltage relative to the range of voltages that would be allowable if a single type of pass transistor were used.

Abstract: A voltage feedback loop employed with a power distribution switch rapidly responds to a predetermined drop in output voltage to increase the resistance of the switch for a predetermined time. After this predetermined time, a current feedback loop controls the resistance until the output voltage recovers, while also isolating the voltage feedback loop from the switch.