Dialog Semiconductor (uk) Limited

Shyam Narayanan

Fulvio Schiappelli

An object of the disclosure is to provide a slope enhancement circuit, comprising an amplifier and a specific arrangement of capacitors and switches, further comprising a current digital to analog converter (IDAC), in a switched regulated current mirror. A method of sample and hold exploits the transient dynamics of the switched current mirror, to enhance the output current slope during PWM operation. A further object of the disclosure is to provide a low power, high speed switching type of regulated current mirror architecture. Still further, another object of the disclosure is to provide quick response to a sudden demand in current with a high degree of accuracy. Still further, another object of the disclosure is to provide a significant savings in circuit area.

Slope enhancement circuit for switched regulated current mirrors

A system for trimming a load current provided to a load terminal has a reference current circuit branch and a load current circuit branch. The reference current circuit branch has a current source, a first variable resistance element and a first decoupling resistance element connected between the current source and the first variable resistance element. The load current circuit branch has the load terminal, a second variable resistance element configured to attain a resistance value depending on a resistance value attained by the first variable resistance element, and a second decoupling resistance element connected between the load terminal and the second variable resistance element. In addition, the trimming system has voltage and current regulators. The current regulator regulates the load current based on a voltage difference between a first output terminal of the first decoupling resistance element and a second output terminal of the second decoupling resistance element.

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Germering, Germany

Shyam Narayanan