Invention Grant
US07920026B2 Amplifier output stage with extended operating range and reduced quiescent current
有权
放大器输出级具有扩展的工作范围和降低的静态电流
- Patent Title: Amplifier output stage with extended operating range and reduced quiescent current
- Patent Title (中): 放大器输出级具有扩展的工作范围和降低的静态电流
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Application No.: US12099099Application Date: 2008-04-07
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Publication No.: US07920026B2Publication Date: 2011-04-05
- Inventor: Rodney Alan Hughes
- Applicant: Rodney Alan Hughes
- Applicant Address: US CA Santa Clara
- Assignee: National Semiconductor Corporation
- Current Assignee: National Semiconductor Corporation
- Current Assignee Address: US CA Santa Clara
- Main IPC: H03F3/45
- IPC: H03F3/45

Abstract:
An output stage of an amplifier circuit includes one or more output transistors that are selectively driven by a boosted drive circuit, where the boosted drive circuit is arranged such that the output range of the amplifier circuit is increased while maintaining reduced quiescent current. The drive signal to each output transistor is selectively increased only when demanded by the output load conditions. The threshold for boosting the drive signal can be adjusted for optimized performance. In one example, a class AB output stage includes a separate drive boost circuit for each output transistor. For this example, each drive boost circuit has a separate threshold for boosting each of the drive signals to the output transistors. The boosting can also be adjusted to optimize the differential input stage and current mirror maximum current requirement while maintaining minimum required bias currents.
Public/Granted literature
- US20090251215A1 AMPLIFIER OUTPUT STAGE WITH EXTENDED OPERATING RANGE AND REDUCED QUIESCENT CURRENT Public/Granted day:2009-10-08
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