Invention Grant
- Patent Title: Baseband filters for use in wireless communication devices
- Patent Title (中): 用于无线通信设备的基带滤波器
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Application No.: US12180936Application Date: 2008-07-28
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Publication No.: US07957716B2Publication Date: 2011-06-07
- Inventor: Jeff Ganger , Niall Duncan , Michael L. Gomez , Christian J. Rotchford
- Applicant: Jeff Ganger , Niall Duncan , Michael L. Gomez , Christian J. Rotchford
- Applicant Address: US TX Austin
- Assignee: Freescale Semiconductor, Inc.
- Current Assignee: Freescale Semiconductor, Inc.
- Current Assignee Address: US TX Austin
- Agency: Ingrassia Fisher & Lorenz, P.C.
- Main IPC: H04B1/26
- IPC: H04B1/26 ; H04B1/16

Abstract:
An embodiment of a baseband filter in a transmitter subsystem of a wireless device comprises an operational amplifier (op-amp), a pole circuit, a feedback capacitor, and an active device. The op-amp is adapted to produce an amplified signal that includes noise gain produced by the op-amp. The pole circuit is electrically coupled with an output terminal of the op-amp, and is adapted to receive the amplified signal and to attenuate the noise gain to produce a filtered, amplified signal. The feedback capacitor is electrically coupled between the first pole circuit and an input terminal of the op-amp, and is adapted to compensate for a phase shift produced by the pole circuit. The active device is electrically coupled with the pole circuit, and is adapted to amplify the filtered, amplified signal and to produce a baseband filtered output signal.
Public/Granted literature
- US20100022215A1 BASEBAND FILTERS FOR USE IN WIRELESS COMMUNICATION DEVICES Public/Granted day:2010-01-28
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