Invention Grant
- Patent Title: Mixer cell with a dynamic bleed circuit
- Patent Title (中): 混合器具有动态放电电路
-
Application No.: US12509327Application Date: 2009-07-24
-
Publication No.: US08280338B2Publication Date: 2012-10-02
- Inventor: Dieter Joos , Steven Terryn
- Applicant: Dieter Joos , Steven Terryn
- Applicant Address: CH Geneva
- Assignee: ST-Ericsson SA
- Current Assignee: ST-Ericsson SA
- Current Assignee Address: CH Geneva
- Agency: Coats & Bennet, P.L.L.C.
- Priority: EP08161226 20080725
- Main IPC: H04B1/26
- IPC: H04B1/26

Abstract:
A mixer is described having a Gilbert cell structure including a first input and a second input for inputting an RF signal, a third input and a fourth input for inputting a local oscillator signal, a first output and a second output for outputting an IF signal, a plurality of switches for converting the RF signal to an IF signal, and a dynamic bleed circuit for dynamically reducing the dc-current of the switches at the switching-point. As the dc-current of the switches is reduced at the point of commutation, the 1/f-noise is also strongly reduced without degrading the linearity. The switching happens at twice the local oscillator frequency. The mixer also includes a common mode feedback circuit that feeds the common mode signal, optionally amplified, to a common mode feedback control device that is in series between the dynamic bleed circuit and the supply voltage.
Public/Granted literature
- US20100029234A1 MIXER CELL WITH A DYNAMIC BLEED CIRCUIT Public/Granted day:2010-02-04
Information query