发明授权
US4999585A Circuit technique for cancelling non-linear capacitor-induced harmonic
distortion
失效
用于消除非线性电容器引起的谐波失真的电路技术
- 专利标题: Circuit technique for cancelling non-linear capacitor-induced harmonic distortion
- 专利标题(中): 用于消除非线性电容器引起的谐波失真的电路技术
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申请号: US432544申请日: 1989-11-06
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公开(公告)号: US4999585A公开(公告)日: 1991-03-12
- 发明人: Rodney T. Burt , Timothy V. Kalthoff , David A. Heisley , R. Mark Stitt, II
- 申请人: Rodney T. Burt , Timothy V. Kalthoff , David A. Heisley , R. Mark Stitt, II
- 申请人地址: AZ Tucson
- 专利权人: Burr-Brown Corporation
- 当前专利权人: Burr-Brown Corporation
- 当前专利权人地址: AZ Tucson
- 主分类号: H03F1/32
- IPC分类号: H03F1/32
摘要:
Circuitry for reducing harmonic distortion in an amplifier includes a first transistor having a first non-linear collector-to-substrate capacitance, a first load device coupled to a collector of the first transistor, a first current source coupled to an emitter of the first transistor, a first conductor conducting an input voltage coupled to a base of the first transistor, and a second conductor coupled to the first load device and conducting an output voltage of the amplifier. The first transistor produces a first non-linear current in the first non-linear collector-to-substrate capacitance in response to the input voltage. A second transistor has a second non-linear collector-to-substrate capacitance. A second current source is coupled to an emitter of the second transistor. The first conductor is coupled to apply the input voltage to a base of the second transistor. The second transistor produces a second non-linear current in the second non-linear collector-to-substrate capacitance in response to the input voltage. A current mirror receives a collector current of the second transistor. The current mirror produces in the second conductor a correction signal substantially equal and opposite to the first non-linear current.