US Patent Application 18191639. CIRCUIT FOR BIASING AN EXTERNAL RESISTIVE SENSOR simplified abstract

CIRCUIT FOR BIASING AN EXTERNAL RESISTIVE SENSOR

Organization Name

STMICROELECTRONICS S.r.l.

Inventor(s)

Dario Livornesi of Milano (IT)

Alessio Emanuele Vergani of Milano (IT)

Paolo Pulici of Legnano (IT)

Francesco Piscitelli of Milano (IT)

Enrico Mammei of Vittuone (IT)

Mojtaba Mohammadi Abdevand of Pavia (IT)

Piero Malcovati of Pavia (IT)

Edoardo Bonizzoni of Pavia (IT)

CIRCUIT FOR BIASING AN EXTERNAL RESISTIVE SENSOR - A simplified explanation of the abstract

This abstract first appeared for US patent application 18191639 titled 'CIRCUIT FOR BIASING AN EXTERNAL RESISTIVE SENSOR

Simplified Explanation

The patent application describes a circuit that includes a biasing circuit and a low-frequency recovery circuit.

• The biasing circuit consists of a voltage digital to analog converter (V-DAC), a differential difference amplifier, a common-mode feedback (CMFB) amplifier, and a pair of transistors.
• The low-frequency recovery circuit consists of a current digital to analog converter (C-DAC), a pair of transistors, a pair of resistors, and a gain circuit.
• The biasing circuit is responsible for providing the appropriate bias voltage to the circuit.
• The low-frequency recovery circuit is responsible for recovering low-frequency signals from a resistive sensor.
• The V-DAC and C-DAC convert digital signals to analog signals for the biasing and recovery circuits, respectively.
• The differential difference amplifier amplifies the voltage difference between two input signals.
• The CMFB amplifier provides feedback to maintain the common-mode voltage of the circuit.
• The high-impedance structure of the transistors helps in maintaining signal integrity.
• The resistors in the low-frequency recovery circuit have a resistance value equal to half of the resistance of the resistive sensor.
• The gain circuit amplifies the recovered low-frequency signals.

Original Abstract Submitted

According to an embodiment, a circuit includes a biasing and a low-frequency recovery circuit. The biasing circuit includes a voltage digital to analog converter (V-DAC), a differential difference amplifier coupled to the V-DAC, a common-mode feedback (CMFB) amplifier coupled to the differential difference amplifier, and a first pair of transistors arranged as a high-impedance structure and coupled to the differential difference amplifier and the CMFB amplifier. The low-frequency recovery circuit includes a current digital to analog converter (C-DAC), a second pair of transistors arranged as a high-impedance structure and coupled to the first pair of transistors, a pair of resistors having a resistance value equal to half a resistance of the resistive sensor, the pair of resistors arranged between the second pair of transistors and coupled to the C-DAC, and a gain circuit coupled to shared nodes between the second pair of transistors and the pair of resistors.