Winbond Electronics Corporation

Jizoo Lin

Bar-Chung Hwang

Yung-Chow Peng

Yung-Peng Hwang

Gwo-Shu Chiou

Jong-Ping Lee

Peng Yung-Chow

A voltage reference circuit and method for producing a voltage as a reference voltage for a liquid crystal display (LCD) panel. The voltage reference circuit with controllable temperature coefficients includes a logic operation unit and a voltage selection circuit. The logic operation unit receives a command corresponding to the temperature coefficient of an LCD panel and provides a selection signal according to the command. The selection signal is applied to the voltage selection circuit. Depending on the selection signal, the voltage selection circuit generates a selected voltage which is used to produce a reference voltage.

Voltage reference with controllable temperature coefficients

A circuit for monitoring battery voltages of a telephone terminal facility is disclosed. This circuit mainly includes a ringing detection circuit for generating a pulse signal in response to an off-hook signal or a ringing signal, a power detecting circuit for detecting battery voltages and a latch being in series connection with the power detecting circuit for outputting a signal showing a status of the detected battery voltages. The power detecting circuit and the latch are of an edge-triggered type and are activated only when a handset of a telephone is picked up or a ringing signal is received so that both the consumed power and the voltage variations are low.

Circuit for monitoring battery voltages of telephone terminal facility,

An analog signal offset cancellation circuit comprising a front end device, a comparator, a sampling device, a resampling clock generator and a recovery data generator is disclosed. In this offset cancellation circuit, the front end device receives an input analog signal. The comparator then compares the input analog signal with a threshold voltage to obtain an output binary signal. The sampling device samples the output binary signal by a sampling signal having a frequency N times that of the output binary signal to obtain sample data. The resampling clock generator then continually reads 2N samples of the sample data and outputs a two period resampling clock with its rising and falling edges determined by the edges and the number of uninterrupted logic one samples of the 2N samples. The resampling clock remains unchanged when the 2N samples are all logic one or all logic zero. The recovery data generator then samples the output binary signal using the resampling clock to obtain recovery data.

Analog signal offset cancellation circuit and method

A device for identifying a line reversal signal and a ringing signal of a telephone set having a built-in ringing detection circuit includes a counter, a comparator and a latch connected with each other in series. The device can determine whether a signal on line is the line reversal signal or the ringing signal of the telephone set without using an installed CPU or a timer thereof, so as to save power and reduce the load of the CPU.

Device for identifying line reversal/ringing signal of a telephone set

A regulated charge pump is provided to boost an amount of voltage while minimizing the well voltage fluctuation during the operation. The charge pump includes a charge pump core which has a first transistor, a second, a third transistor and an integration circuit. The first transistor has a first current electrode for receiving the first power supply voltage and a second current electrode coupled to the first terminal of the charging capacitor. The second transistor has a first current electrode coupled to a second terminal of the charging capacitor, a control electrode and a second electrode for receiving a second power supply voltage. The second transistor is proportionately conductive during the first predetermined time period. The third transistor has a first current electrode for receiving the first power supply voltage, and a second current electrode coupled to the second terminal of the charging capacitor. The third transistor is conductive during the second predetermined time period. The integration circuit is coupled to the control electrode of the second transistor, for changing the second voltage proportionately in response to an integration of a difference between a proportional voltage and a reference voltage by altering a conductivity of the second transistor.

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Hsinchu, Taiwan

Jizoo Lin