Invention Grant
US08195117B2 Integrated switchless programmable attenuator and low noise amplifier
有权
集成无开关可编程衰减器和低噪声放大器
- Patent Title: Integrated switchless programmable attenuator and low noise amplifier
- Patent Title (中): 集成无开关可编程衰减器和低噪声放大器
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Application No.: US12789928Application Date: 2010-05-28
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Publication No.: US08195117B2Publication Date: 2012-06-05
- Inventor: Klaas Bult , Ramon A. Gomez
- Applicant: Klaas Bult , Ramon A. Gomez
- Applicant Address: US CA Irvine
- Assignee: Broadcom Corporation
- Current Assignee: Broadcom Corporation
- Current Assignee Address: US CA Irvine
- Agency: Sterne, Kessler, Goldstein & Fox PLLC
- Main IPC: H04B1/06
- IPC: H04B1/06 ; H04K3/00

Abstract:
An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programmable attenuation and a programmable gain low noise amplifier. Frequency conversion circuitry advantageously uses LC filters integrated onto the substrate in conjunction with image reject mixers to provide sufficient image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. The filters utilize multi track spiral inductors. The filters are tuned using local oscillators to tune a substitute filter, and frequency scaling during filter component values to those of the filter being tuned. In conjunction with filtering, frequency planning provides additional image rejection. The advantageous choice of local oscillator signal generation methods on chip is by PLL out of band local oscillation and by direct synthesis for in band local oscillator. The VCOs in the PLLs are centered using a control circuit to center the tuning capacitance range. A differential crystal oscillator is advantageously used as a frequency reference. Differential signal transmission is advantageously used throughout the receiver.
Public/Granted literature
- US20100237884A1 INTEGRATED SWITCHLESS PROGRAMMABLE ATTENUATOR AND LOW NOISE AMPLIFIER Public/Granted day:2010-09-23
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