Analog voltage latch
AssigneesMatsushita Electric Industrial Co., Ltd., Panasonic Semiconductor Asia Pte., Ltd.
InventorsKian Teck TEO, Tien Yew KANG
Life of this patent
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Abstract
An analog voltage latch for use in a controller for controlling a motor equipped electric bicycle, includes a window comparator for comparing an analog voltage latch output and an analog input voltage to produce a comparison result, an S-R latch for producing HIGH or LOW according to the comparison result, a selector for selecting an operation, an up/down counter for counting up or down according to the HIGH or LOW from the S-R latch, and holding the counted result according to the selector result, and a DA converter for converting the counted result to analog signal.
Claims4
An analog voltage latch comprising:
- a window comparator operable to compare an analog voltage latch output and an analog input voltage to produce a comparison result;
- an S-R latch operable to determine the relation between the analog voltage latch output and the analog input voltage according to the comparison result and to produce an S-R latch result;
- a latching select block operable to activate or deactivate the latching of the analog input voltage;
- an up/down counter operable to increase or decrease number of counts based on the S-R latch result and a clock signal and to produce a digital counter output;
- a digital-to-analog converter operable to convert the digital counter output to an analog voltage as the analog voltage latch output;
- an operational amplifier-based source follower operable to buffer the analog voltage latch output for comparison action in the window comparator;
- and
- a pair of a resistor and a current source operable to provide a voltage drop required by the window comparator.
Dependencies are inferred from the claim text.