Automatic current trimming method and circuits

Details Automatic current trimming method and circuits Automatic current trimming method and circuits

2007-07-14

2010-06-01

He, Amy (Department: 2831)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

C345S077000, C345S082000

Reexamination Certificate

active

07728577

ABSTRACT:
Techniques pertaining to device and method for controlling an analog signal are disclosed. Using a single connection (e.g., a connector or a pin) without an external resistive element (e.g., a resistor), an analog output is digitally controlled and produced. In one embodiment, a precisely controlled current is generated from coded data. A control unit is designed to control a working mode based on an input signal from the connection. The working mode includes a default mode, a programmable mode, a testing mode and a shutdown mode. Under the programmable mode, a user determines a signal coupled in from the connection as desired, and a code unit codes the signal in accordance with a predefined protocol. The code unit then sends the coded data to a decode unit. The decode unit is designed to generate or control the current by the decoded data.

REFERENCES:
patent: 3760269 (1973-09-01), Beeman et al.
patent: 3909788 (1975-09-01), Kaelin et al.
patent: 2007/0222721 (2007-09-01), Yagi

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