Stmicroelectronics International N.v.

Mohit Kaushik

Anil Kumar

Chandrajit Debnath

An amplifier receives an input and a feedback. A first transistor controlled by the amplifier output is coupled between a supply node and the feedback. A second transistor controlled by the amplifier output is coupled to the supply node and generates a bias current. A trimmed resistor coupled between the feedback and ground includes, for trimming resolution of N-bits, where X+Y=N: M resistors, where M=2&#x2212;1, each having a resistance equal to R*(2)*i, i being an index having a value ranging from 1 to 2&#x2212;1, a first of the M resistors having a resistance of R*2, a last of the M resistors having a resistance of R*2*(2&#x2212;1); and M switches associated with the M resistors. Each of the M resistors is between a first node and its associated one of the M switches. Each of the M switches couples its associated one of the M resistors to a second node.

On-chip resistor trimming to compensate for process variation

A resistance trimming circuit has a resolution of N=X+Y bits. Included is a first circuit with M resistors, where M=2&#x2212;1, with each of the M resistors having a resistance of R*(2)*i, i being an index having a value ranging from 1 to 2&#x2212;1. M switches are associated with the M resistors. Each of the M resistors is coupled between a first node and its one of the M switches, and each of the M switches couples its one of the M resistors to a second node. Included is a second circuit with P resistors, where P=2&#x2212;1, with each of the P resistors having a resistance of R*i. P switches are associated with the P resistors. Each of the P resistors is coupled between the second node and its one of the P switches, and each of the P switches selectively couples its one of the P resistors to a third node.

In accordance with an embodiment, a method of performing a successive approximation analog-to-digital (A/D) conversion includes determining a voltage range of an analog input voltage in a single cycle using a multi-bit flash A/D converter, determining an initial D/A value for a successive approximation based on determining the voltage range, and successively approximating the analog input voltage. Successively approximating includes providing the initial D/A value to a D/A converter, comparing an output of the D/A converter with the analog input voltage, and determining a further D/A value based on the comparing.

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Muzaffarnagar, India

Mohit Kaushik