Abstract: A ventilation system for an elevator cab including one or more reversible supply and exhaust fans wherein at least one of the exhaust fans is mounted on the top of the elevator cab, an air-quality monitor affixed to a side wall inside of the elevator cab wherein the air-quality monitor has a user interface for displaying air-quality information to a passenger, and an HVAC system having one or more ducts for delivering at east 150 CFM of ventilation air through the elevator's hoistway, to the elevator cab.

Abstract: A gas sensor operates in an ultra-low power mode when a portable electronic device is inactive and in a normal power mode when the device is active. A baseline resistance value of the gas sensor is stored in the ultra-low power mode. The gas sensor transitions to a normal power mode from the ultra-low power mode, when the portable electronic device is active. A rate of stabilization of resistance value of the gas sensor is computed in the normal power mode. A stabilized resistance value of the gas sensor in the normal power mode is estimated using the rate of stabilization of resistance value of the gas sensor in the normal power mode, the baseline resistance value in the ultra-low power mode and a comparison chart of stabilized resistance values of the gas sensor in the ultra-low power mode and the normal power mode.

Abstract: A dynamic random access memory circuit achieves much higher data bandwidth by maximizing the number of memory cell rows that are held open and by indefinitely increasing the time that the rows are open. The boosted voltage of a pump circuit is directed to active rows according to the presence of a pump token. The pump token is present at one location in a circular shift register corresponding to a memory array. The concurrence of the token and a pump-enable signal causes that array to receive a boosted voltage independent of an array-select operation.

Abstract: A method of improving the boosted wordline compliance of a memory circuit. A wordline is grounded prior to boosting with a voltage greater than the circuit bias voltage (e.g. vdd) from a boost voltage generator. Grounding the wordline pulls the gate of a pass transistor to the bias voltage minus a threshold voltage and prepares the pass transistor to self-boost upon boosting the wordline. The transconductance of the pass transistor is improved, improving the charge transfer from the boost generator to the wordline, decreasing rise time. In another embodiment, an isolation transistor between the wordline select circuit and the pass transistor is boosted to provide additional pass transistor gate voltage.