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US 2004/0104831 A1Published application
Variable bandgap reference and applications thereof
AssigneeSigmatel, Inc.
InventorsMarcus W. May, John Willis
Life of this patent
Estimating the term…
Abstract
A variable bandgap reference includes a fixed bandgap reference source and a supply voltage dependent voltage divider module. The fixed bandgap produces a fixed reference voltage. The supply voltage dependent voltage adjust module adjusts the fixed reference voltage to produce the reference voltage.
Claims11
An adjustable low voltage, digital to analog converter comprises:
- digital to analog converter module operably coupled to convert a digital signal into an analog signal based on a reference voltage;
- and
- variable bandgap module operably coupled to produce the reference voltage, wherein the variable bandgap module includes:
- fixed bandgap reference source to produce a fixed reference voltage;
- and
- supply voltage dependent voltage adjust module operably coupled to adjust the fixed reference voltage to produce the reference voltage.
3 more elements
A variable bandgap module comprises:
- fixed bandgap reference source to produce a fixed reference voltage;
- and
- supply voltage dependent voltage adjust module operably coupled to adjust the fixed reference voltage to produce a reference voltage.
An integrated circuit for use in a handheld multiple function device, the integrated circuit comprises:
- processing module;
- read only memory (ROM);
- random access memory (RAM);
- memory manager;
- digital to analog converter (DAC), wherein the DAC includes:
- digital to analog converter module operably coupled to convert a digital signal into an analog signal based on a reference voltage;
- and
- variable bandgap module operably coupled to produce the reference voltage, wherein the variable bandgap module includes:
- fixed bandgap reference source to produce a fixed reference voltage;
- and
- supply voltage dependent voltage adjust module operably coupled to divide the fixed reference voltage to produce the reference voltage;
- analog to digital converter (ADC);
- and
- bus operably coupled to the processing module, the ROM, the RAM, the memory manager, the digital to analog converter and the analog to digital converter, wherein the RAM includes an ADC first-in-first-out (FIFO) section and a DAC FIFO section, and wherein the memory manager manages access to the RAM among the processing module, the digital to analog converter and the analog to digital converter.
11 more elements
Dependencies are inferred from the claim text.