Analog/digital converter with automatic control for controlling offset and gain
First Claim
1. An integrated circuit for being arranged between a source of higher voltage and a source of lower voltage, including reference current sources and an analog/digital converter with a resistor ladder connected between a terminal called top terminal and a terminal called bottom terminal for producing a series of reference voltages, the bottom terminal being connected to the source of lower voltage via a variable voltage element, characterized in that the circuit includes a bias generator assembly inserted between the source of higher voltage and the top terminal, and automatic control means for controlling the variable voltage element so as to control the voltage on the terminals of the resistor ladder.
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Accused Products
Abstract
The circuit, arranged between a source of higher voltage (VCC) and a source of lower voltage (ground), comprises an analog/digital converter (ADC) which has a resistor ladder (RL) connected between a top terminal (Vtop), a bottom terminal (Vbot) for supplying a series of reference voltages. According to the invention, this circuit includes a bias generator arrangement formed by a resistor (Rmid) connected on one side to the supply voltage source and on the other side to a reference current source (Ip0), and automatic control means (A2) for controlling a variable impedance element (T5) inserted between the connection (Vbot) at the bottom of the ladder and ground, which automatic control means are suitable for controlling the voltage (FS) at the terminals of the resistor ladder.
10 Citations
7 Claims
- 1. An integrated circuit for being arranged between a source of higher voltage and a source of lower voltage, including reference current sources and an analog/digital converter with a resistor ladder connected between a terminal called top terminal and a terminal called bottom terminal for producing a series of reference voltages, the bottom terminal being connected to the source of lower voltage via a variable voltage element, characterized in that the circuit includes a bias generator assembly inserted between the source of higher voltage and the top terminal, and automatic control means for controlling the variable voltage element so as to control the voltage on the terminals of the resistor ladder.
Specification