Passive mixer and four phase clocking method and apparatus

US8099070B2 · kind B2 · utility

Assignee

• Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

• Fenghao Mu · Hjo, SE
• Fredrik Tillman · Lund, SE

Key dates

• Filing date: Apr 23, 2008
• Grant date: Jan 17, 2012
• Expiry date: Aug 24, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03D2200/009
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

According to one embodiment, a radio frequency receiver includes a quadrature mixer for converting radio frequency signals to baseband signals or intermediate frequency signals. The quadrature mixer includes an in-phase passive mixer and a quadrature-phase passive mixer. Each passive mixer includes a mixer core having a plurality of mixer input switch transistors and a plurality of output switch transistors connected to the mixer input switch transistors. Clock circuitry generates a first set of clock signals and a second set of clock signals. The first set of clock signals has a frequency twice that of the second set of clock signals. The first set of clock signals is arranged to drive the mixer input switch transistors and the second set of clock signals is arranged to drive the output switch transistors.