The Hong Kong University of Science and Technology

Yat Hei Lam

Wing Hung Ki

Chi Ying Tsui

Feng Su

An exponential charge pump uses a number of identical or similar charging stages, each having a first and second capacitor. During a first clock phase, the first capacitor of each stage is charged by the second capacitor of the preceding stage, and, during a complementary second clock phase, the positive plate of the first capacitor of each stage is pushed to an increased voltage by the first capacitor of the preceding stage and charges the second capacitor of the next stage to the increased voltage at the same time. A similar mechanism occurs to the second capacitors in each stage, but with complementary timing. The increased voltage of the first capacitor of the last stage is pumped to an output capacitor during the second clock phase, and the increased voltage of the second capacitor of the last stage is pumped to an output capacitor during the first clock phase.

N-stage exponential charge pumps, charging stages therefor and methods of operation thereof

A single inductor multiple-input multiple-output (SI-MIMO) switching converter time-multiplexes different input power sources through only one inductor to provide multiple regulated output voltages, which can be used to power up different blocks of a portable electronic device (or whatever else it is used for) and at the same time to charge up a rechargeable battery. Power multiplexing is achieved by input switches that are also the switching elements of the switching converter, thus eliminating an additional power multiplexer.

Single inductor multiple-input multiple-output switching converter and method of use

A voltage mirror circuit using a symmetrically matched transistor structure is provided. The circuit includes an input reference voltage node on a first side of said circuit and an output mirror voltage node on a second side of said circuit, and a plurality of matched transistor pairs wherein the transistors in each pair have the same aspect ratio and wherein one transistor in each pair is provided on the first side of the circuit and the second transistor in each pair is provided on the second side of said circuit. The transistor pairs may include pairs of NMOS transistors and pairs of PMOS transistors or pairs of bipolar npn transistors and pairs of bipolar pnp transistors.

Growing community of inventors

Hong Kong, China

Yat Hei Lam