Invention Grant
- Patent Title: Continuously variable gain radio frequency driver amplifier having linear in decibel gain control characteristics
- Patent Title (中): 具有线性分贝增益控制特性的连续可变增益射频驱动放大器
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Application No.: US10700860Application Date: 2003-11-03
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Publication No.: US06906592B2Publication Date: 2005-06-14
- Inventor: Kenneth Barnett , Brett C. Walker , Kevin Gard
- Applicant: Kenneth Barnett , Brett C. Walker , Kevin Gard
- Applicant Address: US CA San Diego
- Assignee: Qualcomm Inc
- Current Assignee: Qualcomm Inc
- Current Assignee Address: US CA San Diego
- Agent Philip R Wadsworth; Charles D Brown; George Pappas
- Main IPC: H03F1/30
- IPC: H03F1/30 ; H03G1/04 ; H03G3/30 ; H03G7/00 ; H03G7/06 ; H04B5/00 ; H03G3/20

Abstract:
A radio frequency (RF) driver amplifier system and method that provides linear in decibel gain control is provided. The RF driver amplifier system comprises a linear transconductor receiving an input voltage and providing a controlled current based on input voltage received, temperature compensation circuitry for varying current from the linear transconductor according to absolute temperature, an exponential current controller receiving current varied according to temperature and providing an exponential current in response, and an inductive degeneration compensator receiving exponential current and providing a control current to driver amplifier circuitry, thereby compensating for inductive degeneration due to at least one inductor in the driver amplifier circuitry. Control current passes from the inductive degeneration compensator to the driver amplifier circuitry. Output gain from the driver amplifier circuitry varies linearly in decibels with respect to the input voltage.
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