发明名称 |
Circuit technique for cancelling non-linear capacitor-induced harmonic distortion |
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.
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申请公布号 |
US4999585(A) |
申请公布日期 |
1991.03.12 |
申请号 |
US19890432544 |
申请日期 |
1989.11.06 |
申请人 |
BURR-BROWN CORPORATION |
发明人 |
BURT, RODNEY T.;KALTHOFF, TIMOTHY V.;HEISLEY, DAVID A.;STITT, II, R. MARK |
分类号 |
H03F1/32 |
主分类号 |
H03F1/32 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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