Programmable phase shift circuitry

US6667641B1 · kind B1 · utility

Assignee

• Altera Corporation · US

Inventors

• Bonnie I. Wang · Cupertino, US
• Joseph Huang · معلمی نژاد, US
• Chiakang Sung · Milpitas, US
• Xiaobao Wang · Santa Clara, US
• In Whan Kim · San Jose, US
• Wayne Yeung · San Francisco, US
• Khai Nguyen · San Jose, US

Key dates

• Filing date: Jan 23, 2002
• Grant date: Dec 23, 2003
• Expiry date: Jan 23, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03K2005/00045
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A circuit provides a programmable phase shift feature, where the phase shift is programmably selectable by a user. This circuitry may be incorporated in a programmable logic device (PLD) or field programmable gate array (FPGA) to provide additional programmability features. The programmable phase shift circuitry may be implemented within a phase locked loop (PLL) or delay locked loop (DLL) circuit.