发明授权
- 专利标题: System and method for coarse/fine PLL adjustment
- 专利标题(中): 粗调/精调PLL调整的系统和方法
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申请号: US10440085申请日: 2003-05-19
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公开(公告)号: US07366486B2公开(公告)日: 2008-04-29
- 发明人: Pieter Vorenkamp , Klaas Bult , Frank Carr
- 申请人: Pieter Vorenkamp , Klaas Bult , Frank Carr
- 申请人地址: US CA Irvine
- 专利权人: Broadcom Corporation
- 当前专利权人: Broadcom Corporation
- 当前专利权人地址: US CA Irvine
- 代理机构: Sterne, Kessler, Goldstein & Fox PLLC
- 主分类号: H04B1/26
- IPC分类号: H04B1/26
摘要:
An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programable attenuation and a programable 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.
公开/授权文献
- US20030194978A1 System and method for coarse/fine PLL adjustment 公开/授权日:2003-10-16
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