Invention Grant
US06759904B2 Large gain range, high linearity, low noise MOS VGA 有权
大增益范围,高线性度,低噪声MOS VGA

  • Patent Title: Large gain range, high linearity, low noise MOS VGA
  • Patent Title (中): 大增益范围,高线性度,低噪声MOS VGA
  • Application No.: US10183552
    Application Date: 2002-06-28
  • Publication No.: US06759904B2
    Publication Date: 2004-07-06
  • Inventor: Arya R. Behzad
  • Applicant: Arya R. Behzad
  • Main IPC: H03F345
  • IPC: H03F345
Large gain range, high linearity, low noise MOS VGA
Abstract:
An integrated receiver with channel selection and image rejection is substantially implemented on a single CMOS integrated circuit. A receiver front end provides programable attenuation and a programable gain low noise amplifier. LC filters integrated onto the substrate in conjunction with image reject mixers provide image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. Active filters utilize multi track spiral inductors with shields to increase circuit Q. Frequency planning provides additional image rejection. Local oscillator signal generation methods on chip reduce distortion. A PLL generates needed out of band LO signals. Direct synthesis generates in band LO signals. PLL VCOs are centered automatically. A differential crystal oscillator provides a frequency reference. Differential signal transmission throughout the receiver is used. ESD protection is provided by a pad ring and ESD clamping structure. Shunts utilize a gate boosting at each pin to discharge ESD build up. An IF VGA utilizes distortion cancellation achieved with cross coupled differential pair amplifiers having their Vds dynamically modified in conjunction with current steering of the differential pairs sources.
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