发明名称 |
Chopped auto-zeroed ping-pong amplifier and related apparatus, system, and method |
摘要 |
An apparatus includes a plurality of amplifier stages configured to receive an input voltage and generate an amplified output current. Each amplifier stage includes a transconductance stage configured to receive the input voltage and generate a first intermediate output current. Each amplifier stage also includes an auto-zeroing loop configured to generate a second intermediate output current that at least partially corrects for an offset of the transconductance stage, where the auto-zeroing loop operates at a first frequency. Each amplifier stage further includes chopping circuitry configured to reverse a polarity of the input voltage and a polarity of the amplified output current at a second frequency, where the second frequency is less than the first frequency. Each amplifier stage is configured to operate in auto-zeroing and amplification phases. At least one amplifier stage operates in the auto-zeroing phase when at least one other amplifier stage operates in the amplification phase.
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申请公布号 |
US7834685(B1) |
申请公布日期 |
2010.11.16 |
申请号 |
US20080287947 |
申请日期 |
2008.10.15 |
申请人 |
NATIONAL SEMICONDUCTOR CORPORATION |
发明人 |
PERTIJS MICHIEL ANTONIUS PETRUS |
分类号 |
H03F1/02 |
主分类号 |
H03F1/02 |
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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