Circuit and a method for controlling the bias current in a switched capacitor circuit

US6891439B2 · kind B2 · utility

Assignee

• Advanced Micro Devices, Inc. · US

Inventors

• Rolf Jaehne · Radeberg, DE
• Lutz Dathe · Dresden, DE
• Andreas Huschka · Dresden, DE

Key dates

• Filing date: Feb 7, 2003
• Grant date: May 10, 2005
• Expiry date: May 25, 2023

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03F1/304
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A tunable constant GM circuit allows to compensate for temperature and process variations with high precision by correspondingly adjusting a resistance value and/or the ratio of transistor widths. Thus, in switched capacitor circuits the frequency behaviour, such as the settling time, may be controlled by providing a compensated bias to the transconductance amplifiers typically used in these circuits.